<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.utc.com/role/AccountingPronouncements" xlink:href="utx-20130930.xsd#AccountingPronouncements" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AccountingPronouncementsDetails" xlink:href="utx-20130930.xsd#AccountingPronouncementsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionDispositionsGoodwillAndOtherIntangibleAssetsGoodwillDetails" xlink:href="utx-20130930.xsd#AcquisitionDispositionsGoodwillAndOtherIntangibleAssetsGoodwillDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssets" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssets" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsAmortizationExpenseDetails" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsAmortizationExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsBusinessAcquisitionsDetails" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsBusinessAcquisitionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsConsiderationTransferredInformationDetails" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsConsiderationTransferredInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIaeCollaborationDetails" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIaeCollaborationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIntangibleAssetsDetails" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsProFormaInformationDetails" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsProFormaInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsTables" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsVariableInterestEntityDetails" xlink:href="utx-20130930.xsd#AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsVariableInterestEntityDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/BorrowingAndLinesOfCreditNarrativeDetails" xlink:href="utx-20130930.xsd#BorrowingAndLinesOfCreditNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCredit" xlink:href="utx-20130930.xsd#BorrowingsAndLinesOfCredit" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCreditLongTermDebtDetails" xlink:href="utx-20130930.xsd#BorrowingsAndLinesOfCreditLongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCreditShortTermBorrowingsDetails" xlink:href="utx-20130930.xsd#BorrowingsAndLinesOfCreditShortTermBorrowingsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCreditTables" xlink:href="utx-20130930.xsd#BorrowingsAndLinesOfCreditTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/CondensedConsolidatedBalanceSheet" xlink:href="utx-20130930.xsd#CondensedConsolidatedBalanceSheet" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/CondensedConsolidatedStatementOfCashFlows" xlink:href="utx-20130930.xsd#CondensedConsolidatedStatementOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/CondensedConsolidatedStatementOfComprehensiveIncome" xlink:href="utx-20130930.xsd#CondensedConsolidatedStatementOfComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/ContingentLiabilities" xlink:href="utx-20130930.xsd#ContingentLiabilities" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/ContingentLiabilitiesDetails" xlink:href="utx-20130930.xsd#ContingentLiabilitiesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivables" xlink:href="utx-20130930.xsd#CreditQualityOfLongTermReceivables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivablesClassAndCreditRiskInformationDetails" xlink:href="utx-20130930.xsd#CreditQualityOfLongTermReceivablesClassAndCreditRiskInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivablesReserveAndAdditionalInformationDetails" xlink:href="utx-20130930.xsd#CreditQualityOfLongTermReceivablesReserveAndAdditionalInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivablesTables" xlink:href="utx-20130930.xsd#CreditQualityOfLongTermReceivablesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/DiscontinuedOperations" xlink:href="utx-20130930.xsd#DiscontinuedOperations" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/DiscontinuedOperationsIncomeStatementInformationDetails" xlink:href="utx-20130930.xsd#DiscontinuedOperationsIncomeStatementInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/DiscontinuedOperationsNarrativeDetails" xlink:href="utx-20130930.xsd#DiscontinuedOperationsNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/DiscontinuedOperationsTables" xlink:href="utx-20130930.xsd#DiscontinuedOperationsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/DocumentAndEntityInformation" xlink:href="utx-20130930.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/EarningsPerShare" xlink:href="utx-20130930.xsd#EarningsPerShare" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/EarningsPerShareDetails" xlink:href="utx-20130930.xsd#EarningsPerShareDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/EarningsPerShareTables" xlink:href="utx-20130930.xsd#EarningsPerShareTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/EmployeeBenefitPlans" xlink:href="utx-20130930.xsd#EmployeeBenefitPlans" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/EmployeeBenefitPlansDetails" xlink:href="utx-20130930.xsd#EmployeeBenefitPlansDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/EmployeeBenefitPlansTables" xlink:href="utx-20130930.xsd#EmployeeBenefitPlansTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstruments" xlink:href="utx-20130930.xsd#FinancialInstruments" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstrumentsCommercialAerospaceFinancingCommitmentsDetails" xlink:href="utx-20130930.xsd#FinancialInstrumentsCommercialAerospaceFinancingCommitmentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstrumentsEffectOfForeignExchangeContractsNotDesignatedDetails" xlink:href="utx-20130930.xsd#FinancialInstrumentsEffectOfForeignExchangeContractsNotDesignatedDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstrumentsFairValueHierarchyClassificationDetails" xlink:href="utx-20130930.xsd#FinancialInstrumentsFairValueHierarchyClassificationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstrumentsFairValueOfDerivativeInstrumentsDetails" xlink:href="utx-20130930.xsd#FinancialInstrumentsFairValueOfDerivativeInstrumentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstrumentsImpactFromForeignExchangeDerivativeInstrumentsDetails" xlink:href="utx-20130930.xsd#FinancialInstrumentsImpactFromForeignExchangeDerivativeInstrumentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstrumentsNarrativeDetails" xlink:href="utx-20130930.xsd#FinancialInstrumentsNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/FinancialInstrumentsTables" xlink:href="utx-20130930.xsd#FinancialInstrumentsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/Guarantees" xlink:href="utx-20130930.xsd#Guarantees" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/GuaranteesDetails" xlink:href="utx-20130930.xsd#GuaranteesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/GuaranteesTables" xlink:href="utx-20130930.xsd#GuaranteesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/IncomeTaxes" xlink:href="utx-20130930.xsd#IncomeTaxes" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/IncomeTaxesDetails" xlink:href="utx-20130930.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/IntroductionOfNotesToCondensedConsolidatedFinancialStatements" xlink:href="utx-20130930.xsd#IntroductionOfNotesToCondensedConsolidatedFinancialStatements" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/InventoriesAndContractsInProgress" xlink:href="utx-20130930.xsd#InventoriesAndContractsInProgress" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/InventoriesAndContractsInProgressDetails" xlink:href="utx-20130930.xsd#InventoriesAndContractsInProgressDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/InventoriesAndContractsInProgressTables" xlink:href="utx-20130930.xsd#InventoriesAndContractsInProgressTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/RestructuringAndOtherCosts" xlink:href="utx-20130930.xsd#RestructuringAndOtherCosts" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/RestructuringAndOtherCostsDetails" xlink:href="utx-20130930.xsd#RestructuringAndOtherCostsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/RestructuringAndOtherCostsTables" xlink:href="utx-20130930.xsd#RestructuringAndOtherCostsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/SegmentFinancialData" xlink:href="utx-20130930.xsd#SegmentFinancialData" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/SegmentFinancialDataNarrativeDetails" xlink:href="utx-20130930.xsd#SegmentFinancialDataNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/SegmentFinancialDataTableDetails" xlink:href="utx-20130930.xsd#SegmentFinancialDataTableDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/SegmentFinancialDataTables" xlink:href="utx-20130930.xsd#SegmentFinancialDataTables" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterest" xlink:href="utx-20130930.xsd#ShareownersEquityAndNoncontrollingInterest" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestReclassAndChangesInAccumulatedOtherComprehensiveIncomeDetails" xlink:href="utx-20130930.xsd#ShareownersEquityAndNoncontrollingInterestReclassAndChangesInAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestSummaryOfChangesInShareownersEquityAndNoncontrollingInterestDetails" xlink:href="utx-20130930.xsd#ShareownersEquityAndNoncontrollingInterestSummaryOfChangesInShareownersEquityAndNoncontrollingInterestDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestTables" xlink:href="utx-20130930.xsd#ShareownersEquityAndNoncontrollingInterestTables" xlink:type="simple" />
  <calculationLink xlink:role="http://www.utc.com/role/AccountingPronouncements" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AccountingPronouncementsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionDispositionsGoodwillAndOtherIntangibleAssetsGoodwillDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssets" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsAmortizationExpenseDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsBusinessAcquisitionsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsConsiderationTransferredInformationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_13b6e3b8-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_13b6e3b8-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_10767bb4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_10767bb4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_10224c42-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_10224c42-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_11427534-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_11427534-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent_10259ec4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent_10259ec4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_1010aa46-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_1010aa46-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_12db1734-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_12db1734-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssetsCustomerRelationships" xlink:label="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssetsCustomerRelationships_ebc4d92a-ec54-d5c1-b779-532f912920d3" xlink:type="locator" />
    <calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssetsCustomerRelationships_ebc4d92a-ec54-d5c1-b779-532f912920d3" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssetsTrademarks" xlink:label="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssetsTrademarks_501610dd-bd23-f84b-d285-532f8e2b8d2d" xlink:type="locator" />
    <calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssetsTrademarks_501610dd-bd23-f84b-d285-532f8e2b8d2d" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_10dd47cc-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_10dd47cc-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesShortTermBorrowings" xlink:label="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesShortTermBorrowings_76caeef6-4d2b-ee2e-c99e-532f8e2b8d81" xlink:type="locator" />
    <calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesShortTermBorrowings_76caeef6-4d2b-ee2e-c99e-532f8e2b8d81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_1020bd50-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_1020bd50-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities" xlink:label="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities_4d6527d2-d9bd-11e2-a68d-22000a9d039f" xlink:type="locator" />
    <calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities_4d6527d2-d9bd-11e2-a68d-22000a9d039f" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_10269680-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_10269680-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedprojectedBenefitObligation" xlink:label="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedprojectedBenefitObligation_018d74c6-d9be-11e2-a68d-22000a9d039f" xlink:type="locator" />
    <calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedprojectedBenefitObligation_018d74c6-d9be-11e2-a68d-22000a9d039f" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerContractualObligations" xlink:label="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerContractualObligations_97de8a70-a0d2-9ced-56f7-532fc2985b51" xlink:type="locator" />
    <calculationArc order="15" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerContractualObligations_97de8a70-a0d2-9ced-56f7-532fc2985b51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_106864de-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="16" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_106864de-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_13a27fc2-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="17" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1303979a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_13a27fc2-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_5c519906-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_13b6e3b8-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_Goodwill_5c519906-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIaeCollaborationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIntangibleAssetsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_67013672-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_54b51c2c-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_67013672-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_54b51c2c-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_665b26a6-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_67013672-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_665b26a6-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsProFormaInformationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsVariableInterestEntityDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_b69ddc12-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="utx-20130930.xsd#utx_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets" xlink:label="loc_utx_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets_c4a9c9df-e8b6-bf33-1c52-532fc047308e" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_b69ddc12-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets_c4a9c9df-e8b6-bf33-1c52-532fc047308e" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentAssets" xlink:label="loc_utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentAssets_7505f404-3034-4de4-1035-532f94f12796" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_b69ddc12-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentAssets_7505f404-3034-4de4-1035-532f94f12796" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_b77d35d8-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="utx-20130930.xsd#utx_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities" xlink:label="loc_utx_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities_106f716c-fe00-0902-e33c-532fc03726a8" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_b77d35d8-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities_106f716c-fe00-0902-e33c-532fc03726a8" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentLiabilities" xlink:label="loc_utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentLiabilities_0783f239-94da-5332-34a4-532f9119b4a7" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_b77d35d8-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentLiabilities_0783f239-94da-5332-34a4-532f9119b4a7" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/BorrowingAndLinesOfCreditNarrativeDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/BorrowingsAndLinesOfCredit" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/BorrowingsAndLinesOfCreditLongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_754fc3b0-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="utx-20130930.xsd#utx_PrincipalLongTermDebt" xlink:label="loc_utx_PrincipalLongTermDebt_33ab1698-cec5-1e5d-a0ac-532f8e1b0c04" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_754fc3b0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_PrincipalLongTermDebt_33ab1698-cec5-1e5d-a0ac-532f8e1b0c04" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_OtherLongTermDebtFairMarketValueAdjustments" xlink:label="loc_utx_OtherLongTermDebtFairMarketValueAdjustments_582c6f5a-8aee-f710-ec41-532fa8d7a8f3" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_754fc3b0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_OtherLongTermDebtFairMarketValueAdjustments_582c6f5a-8aee-f710-ec41-532fa8d7a8f3" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/BorrowingsAndLinesOfCreditShortTermBorrowingsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_ac47dff6-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommercialPaper" xlink:label="loc_us-gaap_CommercialPaper_1e0c6126-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ShortTermBorrowings_ac47dff6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CommercialPaper_1e0c6126-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherShortTermBorrowings" xlink:label="loc_us-gaap_OtherShortTermBorrowings_85880d50-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ShortTermBorrowings_ac47dff6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_OtherShortTermBorrowings_85880d50-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/BorrowingsAndLinesOfCreditTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/CondensedConsolidatedBalanceSheet" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_6e1ed1d0-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_6e59ec02-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6e1ed1d0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_Liabilities_6e59ec02-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_6e17fb62-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6e59ec02-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_LiabilitiesCurrent_6e17fb62-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_ac47dff6-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6e17fb62-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ShortTermBorrowings_ac47dff6-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_05630b34-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6e17fb62-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_AccountsPayableCurrent_05630b34-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_0607a31a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6e17fb62-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_0607a31a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_6e5e900e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6e17fb62-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_6e5e900e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_75d8c84a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6e17fb62-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_75d8c84a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_758ffbec-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6e59ec02-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_758ffbec-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_8bcadcec-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6e59ec02-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_8bcadcec-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_85390368-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6e59ec02-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_85390368-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_adca42f6-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6e1ed1d0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_adca42f6-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_adc32df4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_adca42f6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_StockholdersEquity_adc32df4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStocksIncludingAdditionalPaidInCapital" xlink:label="loc_us-gaap_CommonStocksIncludingAdditionalPaidInCapital_1ecf0bb8-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_adc32df4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CommonStocksIncludingAdditionalPaidInCapital_1ecf0bb8-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_b2297f42-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_adc32df4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_TreasuryStockValue_b2297f42-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a33a731a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_adc32df4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a33a731a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnearnedESOPShares" xlink:label="loc_us-gaap_UnearnedESOPShares_b2dd657a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_adc32df4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_UnearnedESOPShares_b2dd657a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_062fd1c8-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_adc32df4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_062fd1c8-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_7a4f00ec-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_adca42f6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_MinorityInterest_7a4f00ec-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TemporaryEquityRedemptionValue" xlink:label="loc_us-gaap_TemporaryEquityRedemptionValue_b0529096-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6e1ed1d0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_TemporaryEquityRedemptionValue_b0529096-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashCashEquivalentsAndShortTermInvestments" xlink:label="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_18944d80-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_18944d80-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="loc_us-gaap_ReceivablesNetCurrent_98905b14-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ReceivablesNetCurrent_98905b14-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_6952f2e4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_InventoryNet_6952f2e4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_2af7d532-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_DeferredTaxAssetsNetCurrent_2af7d532-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_0d19f2ac-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_0d19f2ac-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_83b7103e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0d216a96-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_OtherAssetsCurrent_83b7103e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_CustomerFinancingAssets" xlink:label="loc_utx_CustomerFinancingAssets_6379c522-a39d-50c4-e41d-532f8e2b3b4b" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_CustomerFinancingAssets_6379c522-a39d-50c4-e41d-532f8e2b3b4b" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsNetNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_2b1f2682-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_2b1f2682-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_940b342e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_940b342e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_9406abd4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_940b342e-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_9406abd4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_061c48ec-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_940b342e-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_061c48ec-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_5c519906-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_Goodwill_5c519906-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_6701f814-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_6701f814-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_837d6190-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_0ce13e30-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_837d6190-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/CondensedConsolidatedStatementOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_181e990a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_181e990a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_6155c1d4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_6155c1d4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_328af0ea-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_328af0ea-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_2a198e26-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_2a198e26-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_ab78f61e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ShareBasedCompensation_ab78f61e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_63aa6f5c-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_63aa6f5c-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_63654850-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_63654850-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_63a56200-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_63a56200-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_63119b74-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_63119b74-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionContributions" xlink:label="loc_us-gaap_PensionContributions_8bcb7a44-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PensionContributions_8bcb7a44-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_83825128-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_7bb4725a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_83825128-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_181e990a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_8abc6b7c-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_8abc6b7c-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_8ab7510a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_8ab7510a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates_92cfa4b4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates_92cfa4b4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_IncreaseDecreaseInCustomerFinancingAssets" xlink:label="loc_utx_IncreaseDecreaseInCustomerFinancingAssets_6b51fb37-f39e-d614-4a3f-532f8e2bfeee" xlink:type="locator" />
    <calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_IncreaseDecreaseInCustomerFinancingAssets_6b51fb37-f39e-d614-4a3f-532f8e2bfeee" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_IncreasedDecreaseInCollaborationIntangibles" xlink:label="loc_utx_IncreasedDecreaseInCollaborationIntangibles_1023969d-6098-56d0-7741-532f8e2b3b86" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_IncreasedDecreaseInCollaborationIntangibles_1023969d-6098-56d0-7741-532f8e2b3b86" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_8aadd2ce-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_8aadd2ce-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInRestrictedCash" xlink:label="loc_us-gaap_IncreaseDecreaseInRestrictedCash_63cd9f36-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_7c98dde6-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncreaseDecreaseInRestrictedCash_63cd9f36-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_181e990a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities_9282a9fc-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities_9282a9fc-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_92a6a5dc-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_92a6a5dc-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromStockPlans" xlink:label="loc_us-gaap_ProceedsFromStockPlans_93419ee8-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ProceedsFromStockPlans_93419ee8-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_8ad803f0-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_8ad803f0-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_8932a1c2-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_8932a1c2-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_92652922-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_7c8adca0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_92652922-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInDiscontinuedOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_7ba3d6fc-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_181e990a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_7ba3d6fc-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_18aaf9ae-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_7ba3d6fc-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_18aaf9ae-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_188f4506-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_7ba3d6fc-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_188f4506-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_3fcc8200-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_181e990a-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_3fcc8200-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/CondensedConsolidatedStatementOfComprehensiveIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_60d6cab4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_3af02dcc-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_60d6cab4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_3af02dcc-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_3ae5c058-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_60d6cab4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_3ae5c058-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_3ae2ac88-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_60d6cab4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_3ae2ac88-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_6155c1d4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6058d0a0-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_6155c1d4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6058d0a0-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_8028df7e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6058d0a0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_OperatingIncomeLoss_8028df7e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_a7332b38-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8028df7e-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_SalesRevenueNet_a7332b38-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalesRevenueGoodsNet" xlink:label="loc_us-gaap_SalesRevenueGoodsNet_a73282be-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesRevenueNet_a7332b38-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_SalesRevenueGoodsNet_a73282be-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_a73bc11c-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesRevenueNet_a7332b38-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_SalesRevenueServicesNet_a73bc11c-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_23967884-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8028df7e-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CostsAndExpenses_23967884-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfGoodsSold" xlink:label="loc_us-gaap_CostOfGoodsSold_22d5e98e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_23967884-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CostOfGoodsSold_22d5e98e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfServices" xlink:label="loc_us-gaap_CostOfServices_236e061a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_23967884-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_CostOfServices_236e061a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_a17a5cf2-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_23967884-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_a17a5cf2-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_aace0d80-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_23967884-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_aace0d80-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherIncome" xlink:label="loc_us-gaap_OtherIncome_84e6f4c4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8028df7e-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_OtherIncome_84e6f4c4-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_67eab6b2-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_6058d0a0-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_67eab6b2-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_610ca94a-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_6155c1d4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_610ca94a-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_7cc2c354-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_602091c2-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_7cc2c354-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_602091c2-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_617d425e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_7cc2c354-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_617d425e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/ContingentLiabilities" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/ContingentLiabilitiesDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/CreditQualityOfLongTermReceivables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/CreditQualityOfLongTermReceivablesClassAndCreditRiskInformationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/CreditQualityOfLongTermReceivablesReserveAndAdditionalInformationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/CreditQualityOfLongTermReceivablesTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/DiscontinuedOperations" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/DiscontinuedOperationsIncomeStatementInformationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/DiscontinuedOperationsNarrativeDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/DiscontinuedOperationsTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/EarningsPerShare" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/EarningsPerShareDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_b93d27d4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_b91dcd62-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_b93d27d4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_b91dcd62-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_6554f444-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_b93d27d4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_6554f444-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/EarningsPerShareTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/EmployeeBenefitPlans" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/EmployeeBenefitPlansDetails" xlink:type="extended">
    <loc xlink:href="utx-20130930.xsd#utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments" xlink:label="loc_utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments_0aa5aa61-4cfc-87a0-42c9-532fc056a5a1" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_2ed07830-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments_0aa5aa61-4cfc-87a0-42c9-532fc056a5a1" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_2ed07830-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_2ef72430-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments_0aa5aa61-4cfc-87a0-42c9-532fc056a5a1" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_2ef72430-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_2f0f96fa-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments_0aa5aa61-4cfc-87a0-42c9-532fc056a5a1" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_2f0f96fa-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_DefinedBenefitPlanAmortizationOfTransitionObligationsAssetsAndPriorServiceCostCredit" xlink:label="loc_utx_DefinedBenefitPlanAmortizationOfTransitionObligationsAssetsAndPriorServiceCostCredit_260b8d84-7053-f89a-8e3e-532f864c2f3f" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments_0aa5aa61-4cfc-87a0-42c9-532fc056a5a1" xlink:to="loc_utx_DefinedBenefitPlanAmortizationOfTransitionObligationsAssetsAndPriorServiceCostCredit_260b8d84-7053-f89a-8e3e-532f864c2f3f" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_2d092682-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments_0aa5aa61-4cfc-87a0-42c9-532fc056a5a1" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_2d092682-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_2d2778b2-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments_0aa5aa61-4cfc-87a0-42c9-532fc056a5a1" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_2d2778b2-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/EmployeeBenefitPlansTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstruments" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstrumentsCommercialAerospaceFinancingCommitmentsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstrumentsEffectOfForeignExchangeContractsNotDesignatedDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstrumentsFairValueHierarchyClassificationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstrumentsFairValueOfDerivativeInstrumentsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstrumentsImpactFromForeignExchangeDerivativeInstrumentsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstrumentsNarrativeDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/FinancialInstrumentsTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/Guarantees" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/GuaranteesDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/GuaranteesTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/IncomeTaxes" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/IncomeTaxesDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/IntroductionOfNotesToCondensedConsolidatedFinancialStatements" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/InventoriesAndContractsInProgress" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/InventoriesAndContractsInProgressDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_6952f2e4-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <loc xlink:href="utx-20130930.xsd#utx_InventoryBeforePaymentsAndBillings" xlink:label="loc_utx_InventoryBeforePaymentsAndBillings_b0dfc7ce-66a0-78d3-6f98-532f9e38900e" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_6952f2e4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_InventoryBeforePaymentsAndBillings_b0dfc7ce-66a0-78d3-6f98-532f9e38900e" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_698b130e-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_InventoryBeforePaymentsAndBillings_b0dfc7ce-66a0-78d3-6f98-532f9e38900e" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_698b130e-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_69eed312-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_InventoryBeforePaymentsAndBillings_b0dfc7ce-66a0-78d3-6f98-532f9e38900e" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_69eed312-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_69867b82-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_InventoryBeforePaymentsAndBillings_b0dfc7ce-66a0-78d3-6f98-532f9e38900e" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_69867b82-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryForLongTermContractsOrPrograms" xlink:label="loc_us-gaap_InventoryForLongTermContractsOrPrograms_696a3cce-9656-11e2-88e7-12313d1a0274" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_utx_InventoryBeforePaymentsAndBillings_b0dfc7ce-66a0-78d3-6f98-532f9e38900e" xlink:to="loc_us-gaap_InventoryForLongTermContractsOrPrograms_696a3cce-9656-11e2-88e7-12313d1a0274" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_ProgressPaymentsNettedAgainstInventoryForLongTermUSGovernmentContractsOrPrograms" xlink:label="loc_utx_ProgressPaymentsNettedAgainstInventoryForLongTermUSGovernmentContractsOrPrograms_cf616573-e956-6f2e-f500-532f95014105" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_6952f2e4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_ProgressPaymentsNettedAgainstInventoryForLongTermUSGovernmentContractsOrPrograms_cf616573-e956-6f2e-f500-532f95014105" xlink:type="arc" />
    <loc xlink:href="utx-20130930.xsd#utx_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrProgramsExcludingGovernment" xlink:label="loc_utx_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrProgramsExcludingGovernment_33a7661e-51c8-c30b-744d-532f94f1d04d" xlink:type="locator" />
    <calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_6952f2e4-9656-11e2-88e7-12313d1a0274" xlink:to="loc_utx_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrProgramsExcludingGovernment_33a7661e-51c8-c30b-744d-532f94f1d04d" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.utc.com/role/InventoriesAndContractsInProgressTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/RestructuringAndOtherCosts" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/RestructuringAndOtherCostsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/RestructuringAndOtherCostsTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/SegmentFinancialData" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/SegmentFinancialDataNarrativeDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/SegmentFinancialDataTableDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/SegmentFinancialDataTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterest" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestReclassAndChangesInAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestSummaryOfChangesInShareownersEquityAndNoncontrollingInterestDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestTables" xlink:type="extended" />
</linkbase>
