<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.utc.com/20140331" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:utx="http://www.utc.com/20140331" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:import namespace="http://fasb.org/us-gaap/2013-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2013-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2013/elts/us-roles-2013-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-types/2013-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2013/elts/us-types-2013-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2013-01-31" schemaLocation="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/currency/2012-01-31" schemaLocation="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2013-01-31" schemaLocation="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/exch/2013-01-31" schemaLocation="http://xbrl.sec.gov/exch/2013/exch-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd" />
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20140331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20140331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20140331_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20140331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple" />
      <link:roleType id="AccountingPronouncements" roleURI="http://www.utc.com/role/AccountingPronouncements">
        <link:definition>2117100 - Disclosure - Accounting Pronouncements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountingPronouncementsDetails" roleURI="http://www.utc.com/role/AccountingPronouncementsDetails">
        <link:definition>2417401 - Disclosure - Accounting Pronouncements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionDispositionsGoodwillAndOtherIntangibleAssetsGoodwillDetails" roleURI="http://www.utc.com/role/AcquisitionDispositionsGoodwillAndOtherIntangibleAssetsGoodwillDetails">
        <link:definition>2402405 - Disclosure - Acquisition, Dispositions, Goodwill and Other Intangible Assets (Goodwill) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDispositionsGoodwillAndOtherIntangibleAssets" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssets">
        <link:definition>2102100 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsAmortizationExpenseDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsAmortizationExpenseDetails">
        <link:definition>2402407 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Amortization Expense) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIaeCollaborationDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIaeCollaborationDetails">
        <link:definition>2402403 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets (IAE Collaboration) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIntangibleAssetsDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsIntangibleAssetsDetails">
        <link:definition>2402406 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsTables" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsTables">
        <link:definition>2302301 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsVariableInterestEntityDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsVariableInterestEntityDetails">
        <link:definition>2402404 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Variable Interest Entity) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsdetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillAndOtherIntangibleAssetsdetails">
        <link:definition>2402402 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets(Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingAndLinesOfCreditNarrativeDetails" roleURI="http://www.utc.com/role/BorrowingAndLinesOfCreditNarrativeDetails">
        <link:definition>2406403 - Disclosure - Borrowing and Lines of Credit (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsAndLinesOfCredit" roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCredit">
        <link:definition>2106100 - Disclosure - Borrowings and Lines of Credit</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsAndLinesOfCreditLongTermDebtDetails" roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCreditLongTermDebtDetails">
        <link:definition>2406404 - Disclosure - Borrowings and Lines of Credit (Long-Term Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsAndLinesOfCreditShortTermBorrowingsDetails" roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCreditShortTermBorrowingsDetails">
        <link:definition>2406402 - Disclosure - Borrowings and Lines of Credit (Short-Term Borrowings) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsAndLinesOfCreditTables" roleURI="http://www.utc.com/role/BorrowingsAndLinesOfCreditTables">
        <link:definition>2306301 - Disclosure - Borrowings and Lines of Credit (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheet" roleURI="http://www.utc.com/role/CondensedConsolidatedBalanceSheet">
        <link:definition>1002000 - Statement - Condensed Consolidated Balance Sheet</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementOfCashFlows" roleURI="http://www.utc.com/role/CondensedConsolidatedStatementOfCashFlows">
        <link:definition>1003000 - Statement - Condensed Consolidated Statement of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementOfComprehensiveIncome" roleURI="http://www.utc.com/role/CondensedConsolidatedStatementOfComprehensiveIncome">
        <link:definition>1001000 - Statement - Condensed Consolidated Statement of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilities" roleURI="http://www.utc.com/role/ContingentLiabilities">
        <link:definition>2115100 - Disclosure - Contingent Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesDetails" roleURI="http://www.utc.com/role/ContingentLiabilitiesDetails">
        <link:definition>2415401 - Disclosure - Contingent Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CreditQualityOfLongTermReceivables" roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivables">
        <link:definition>2112100 - Disclosure - Credit Quality of Long-term Receivables</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CreditQualityOfLongTermReceivablesClassAndCreditRiskInformationDetails" roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivablesClassAndCreditRiskInformationDetails">
        <link:definition>2412403 - Disclosure - Credit Quality of Long-term Receivables (Class and Credit Risk Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CreditQualityOfLongTermReceivablesReserveAndAdditionalInformationDetails" roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivablesReserveAndAdditionalInformationDetails">
        <link:definition>2412402 - Disclosure - Credit Quality of Long-term Receivables (Reserve and Additional Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CreditQualityOfLongTermReceivablesTables" roleURI="http://www.utc.com/role/CreditQualityOfLongTermReceivablesTables">
        <link:definition>2312301 - Disclosure - Credit Quality of Long-term Receivables (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DiscontinuedOperations" roleURI="http://www.utc.com/role/DiscontinuedOperations">
        <link:definition>2103100 - Disclosure - Discontinued Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DiscontinuedOperationsIncomeStatementInformationDetails" roleURI="http://www.utc.com/role/DiscontinuedOperationsIncomeStatementInformationDetails">
        <link:definition>2403403 - Disclosure - Discontinued Operations (Income Statement Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DiscontinuedOperationsNarrativeDetails" roleURI="http://www.utc.com/role/DiscontinuedOperationsNarrativeDetails">
        <link:definition>2403402 - Disclosure - Discontinued Operations (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DiscontinuedOperationsTables" roleURI="http://www.utc.com/role/DiscontinuedOperationsTables">
        <link:definition>2303301 - Disclosure - Discontinued Operations (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DocumentAndEntityInformation" roleURI="http://www.utc.com/role/DocumentAndEntityInformation">
        <link:definition>0001000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShare" roleURI="http://www.utc.com/role/EarningsPerShare">
        <link:definition>2104100 - Disclosure - Earnings Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareDetails" roleURI="http://www.utc.com/role/EarningsPerShareDetails">
        <link:definition>2404402 - Disclosure - Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareTables" roleURI="http://www.utc.com/role/EarningsPerShareTables">
        <link:definition>2304301 - Disclosure - Earnings Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlans" roleURI="http://www.utc.com/role/EmployeeBenefitPlans">
        <link:definition>2108100 - Disclosure - Employee Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansDetails" roleURI="http://www.utc.com/role/EmployeeBenefitPlansDetails">
        <link:definition>2408402 - Disclosure - Employee Benefit Plans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansTables" roleURI="http://www.utc.com/role/EmployeeBenefitPlansTables">
        <link:definition>2308301 - Disclosure - Employee Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.utc.com/role/FairValueMeasurements">
        <link:definition>2111100 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsCommercialAerospaceFinancingCommitmentsDetails" roleURI="http://www.utc.com/role/FairValueMeasurementsCommercialAerospaceFinancingCommitmentsDetails">
        <link:definition>2411403 - Disclosure - Fair Value Measurements (Commercial Aerospace Financing Commitments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsFairValueHierarchyClassificationDetails" roleURI="http://www.utc.com/role/FairValueMeasurementsFairValueHierarchyClassificationDetails">
        <link:definition>2411402 - Disclosure - Fair Value Measurements (Fair Value Hierarchy Classification) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.utc.com/role/FairValueMeasurementsTables">
        <link:definition>2311301 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstruments" roleURI="http://www.utc.com/role/FinancialInstruments">
        <link:definition>2110100 - Disclosure - Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsEffectOfForeignExchangeContractsNotDesignatedDetails" roleURI="http://www.utc.com/role/FinancialInstrumentsEffectOfForeignExchangeContractsNotDesignatedDetails">
        <link:definition>2410405 - Disclosure - Financial Instruments (Effect of Foreign Exchange Contracts Not Designated) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsFairValueOfDerivativeInstrumentsDetails" roleURI="http://www.utc.com/role/FinancialInstrumentsFairValueOfDerivativeInstrumentsDetails">
        <link:definition>2410403 - Disclosure - Financial Instruments (Fair Value of Derivative Instruments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsImpactFromForeignExchangeDerivativeInstrumentsDetails" roleURI="http://www.utc.com/role/FinancialInstrumentsImpactFromForeignExchangeDerivativeInstrumentsDetails">
        <link:definition>2410404 - Disclosure - Financial Instruments (Impact From Foreign Exchange Derivative Instruments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsNarrativeDetails" roleURI="http://www.utc.com/role/FinancialInstrumentsNarrativeDetails">
        <link:definition>2410402 - Disclosure - Financial Instruments (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsTables" roleURI="http://www.utc.com/role/FinancialInstrumentsTables">
        <link:definition>2310301 - Disclosure - Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Guarantees" roleURI="http://www.utc.com/role/Guarantees">
        <link:definition>2114100 - Disclosure - Guarantees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GuaranteesDetails" roleURI="http://www.utc.com/role/GuaranteesDetails">
        <link:definition>2414402 - Disclosure - Guarantees (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GuaranteesTables" roleURI="http://www.utc.com/role/GuaranteesTables">
        <link:definition>2314301 - Disclosure - Guarantees (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.utc.com/role/IncomeTaxes">
        <link:definition>2107100 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesDetails" roleURI="http://www.utc.com/role/IncomeTaxesDetails">
        <link:definition>2407401 - Disclosure - Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IntroductionOfNotesToCondensedConsolidatedFinancialStatements" roleURI="http://www.utc.com/role/IntroductionOfNotesToCondensedConsolidatedFinancialStatements">
        <link:definition>2101100 - Disclosure - Introduction of Notes to Condensed Consolidated Financial Statements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesAndContractsInProgress" roleURI="http://www.utc.com/role/InventoriesAndContractsInProgress">
        <link:definition>2105100 - Disclosure - Inventories and Contracts in Progress</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesAndContractsInProgressDetails" roleURI="http://www.utc.com/role/InventoriesAndContractsInProgressDetails">
        <link:definition>2405402 - Disclosure - Inventories and Contracts in Progress (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesAndContractsInProgressTables" roleURI="http://www.utc.com/role/InventoriesAndContractsInProgressTables">
        <link:definition>2305301 - Disclosure - Inventories and Contracts in Progress (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RestructuringAndOtherCosts" roleURI="http://www.utc.com/role/RestructuringAndOtherCosts">
        <link:definition>2109100 - Disclosure - Restructuring and Other Costs</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RestructuringAndOtherCostsDetails" roleURI="http://www.utc.com/role/RestructuringAndOtherCostsDetails">
        <link:definition>2409402 - Disclosure - Restructuring and Other Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RestructuringAndOtherCostsTables" roleURI="http://www.utc.com/role/RestructuringAndOtherCostsTables">
        <link:definition>2309301 - Disclosure - Restructuring and Other Costs (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentFinancialData" roleURI="http://www.utc.com/role/SegmentFinancialData">
        <link:definition>2116100 - Disclosure - Segment Financial Data</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentFinancialDataNarrativeDetails" roleURI="http://www.utc.com/role/SegmentFinancialDataNarrativeDetails">
        <link:definition>2416402 - Disclosure - Segment Financial Data (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentFinancialDataTableDetails" roleURI="http://www.utc.com/role/SegmentFinancialDataTableDetails">
        <link:definition>2416403 - Disclosure - Segment Financial Data (Table) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentFinancialDataTables" roleURI="http://www.utc.com/role/SegmentFinancialDataTables">
        <link:definition>2316301 - Disclosure - Segment Financial Data (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareownersEquityAndNoncontrollingInterest" roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterest">
        <link:definition>2113100 - Disclosure - Shareowners' Equity and Noncontrolling Interest</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareownersEquityAndNoncontrollingInterestReclassAndChangesInAccumulatedOtherComprehensiveIncomeDetails" roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestReclassAndChangesInAccumulatedOtherComprehensiveIncomeDetails">
        <link:definition>2413403 - Disclosure - Shareowners' Equity and Noncontrolling Interest (Reclass and Changes in Accumulated Other Comprehensive Income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareownersEquityAndNoncontrollingInterestSummaryOfChangesInShareownersEquityAndNoncontrollingInterestDetails" roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestSummaryOfChangesInShareownersEquityAndNoncontrollingInterestDetails">
        <link:definition>2413402 - Disclosure - Shareowners' Equity and Noncontrolling Interest (Summary of Changes in Shareowners' Equity and Noncontrolling Interest) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareownersEquityAndNoncontrollingInterestTables" roleURI="http://www.utc.com/role/ShareownersEquityAndNoncontrollingInterestTables">
        <link:definition>2313301 - Disclosure - Shareowners' Equity and Noncontrolling Interest (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element abstract="true" id="utx_ASUNo.201408Member" name="ASUNo.201408Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_AcquisitionCostOfAcquiredEntitiesAndInterestInAffiliates" name="AcquisitionCostOfAcquiredEntitiesAndInterestInAffiliates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="utx_AcqusitionsDispositionsGoodwillAndOtherIntangibleAssetsTextBlock" name="AcqusitionsDispositionsGoodwillAndOtherIntangibleAssetsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_AggregateLineOfCreditFacilityMaximumBorrowingCapacity" name="AggregateLineOfCreditFacilityMaximumBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="utx_AmountOfRedeemableNoncontrollingInterestReclassified" name="AmountOfRedeemableNoncontrollingInterestReclassified" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_April2014RedemptionCallMemberDomain" name="April2014RedemptionCallMemberDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_AssetWriteDownsMember" name="AssetWriteDownsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_BusinessDispositionsFairValueDisclosure" name="BusinessDispositionsFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="utx_CashAndCashEquivalentsAndShortTermInvestmentsTotalOperations" name="CashAndCashEquivalentsAndShortTermInvestmentsTotalOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="utx_CashCashEquivalentsAndShortTermInvestmentsTotalOperations" name="CashCashEquivalentsAndShortTermInvestmentsTotalOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_CollaborationMember" name="CollaborationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_CommercialAerospaceMember" name="CommercialAerospaceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_CurrentYearActionsMember" name="CurrentYearActionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_CustomerFinancingAssets" name="CustomerFinancingAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="utx_CustomerFinancingNotesReceivableFairValueDisclosure" name="CustomerFinancingNotesReceivableFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="utx_DebtInstrumentLondonInterbankOfferedRate" name="DebtInstrumentLondonInterbankOfferedRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_DefinedBenefitPlanAmortizationOfTransitionObligationsAssetsAndPriorServiceCostCredit" name="DefinedBenefitPlanAmortizationOfTransitionObligationsAssetsAndPriorServiceCostCredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_DepartmentOfDefenseContractClaimAgainstSikorskyMember" name="DepartmentOfDefenseContractClaimAgainstSikorskyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_DepartmentOfJusticeLawsuitAgainstPrattAndWhitneyMember" name="DepartmentOfJusticeLawsuitAgainstPrattAndWhitneyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_DiscontinuedOperationCashPayment" name="DiscontinuedOperationCashPayment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments" name="DiscontinuedOperationsDefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_EliminationsAndOtherMember" name="EliminationsAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_EquityAndRedeemableNoncontrollingInterestComponentDomain" name="EquityAndRedeemableNoncontrollingInterestComponentDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_EstimatedTaxSettlementGainLossNoncashRangeLowerLimit" name="EstimatedTaxSettlementGainLossNoncashRangeLowerLimit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_EstimatedTaxSettlementGainLossNoncashRangeUpperLimit" name="EstimatedTaxSettlementGainLossNoncashRangeUpperLimit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_EstimatedTaxSettlementInterestGainLossNoncashRangeLowerLimit" name="EstimatedTaxSettlementInterestGainLossNoncashRangeLowerLimit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_EstimatedTaxSettlementInterestGainLossNoncashRangeUpperLimit" name="EstimatedTaxSettlementInterestGainLossNoncashRangeUpperLimit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_ExtinguishmentOfDebtActionsDomain" name="ExtinguishmentOfDebtActionsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_ExtinguishmentofDebtActionsAxis" name="ExtinguishmentofDebtActionsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_FacilityExitMember" name="FacilityExitMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_FinancingReceivableReserveForCreditLossesAndExposure" name="FinancingReceivableReserveForCreditLossesAndExposure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="utx_FourQuarterRollingAverageOfNotionalAmountOfForeignExchangeContractsHedgingForeignCurrencyTransactions" name="FourQuarterRollingAverageOfNotionalAmountOfForeignExchangeContractsHedgingForeignCurrencyTransactions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_GeneralCorporateExpensesMember" name="GeneralCorporateExpensesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_GermanTaxOfficeAgainstOtisMember" name="GermanTaxOfficeAgainstOtisMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_GoodwillTranslationAndOther" name="GoodwillTranslationAndOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_IAECollaborationMember" name="IAECollaborationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_IncreaseDecreaseInCustomerFinancingAssets" name="IncreaseDecreaseInCustomerFinancingAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_IncreasedDecreaseInCollaborationIntangibles" name="IncreasedDecreaseInCollaborationIntangibles" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_InternationalAeroEnginesAGMember" name="InternationalAeroEnginesAGMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_InventoryBeforePaymentsAndBillings" name="InventoryBeforePaymentsAndBillings" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="utx_InventoryTextBlock" name="InventoryTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_JuniorSubordinatedNotes1550Due2022Member" name="JuniorSubordinatedNotes1550Due2022Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_LIBORPlus0500FloatingRateNotesDue2015Member" name="LIBORPlus0500FloatingRateNotesDue2015Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure" name="LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="utx_LongTermReceivablesFairValueDisclosure" name="LongTermReceivablesFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_LongTermTradeAccountsReceivableFinancingReceivableMember" name="LongTermTradeAccountsReceivableFinancingReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_LossContingenciesByPartyAxis" name="LossContingenciesByPartyAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_LossContingencyActionsTakenByPlaintiffAndDefendant" name="LossContingencyActionsTakenByPlaintiffAndDefendant" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_LossContingencyDamagesAwardedValueNotIncludingInterest" name="LossContingencyDamagesAwardedValueNotIncludingInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_LossContingencyPartyDomain" name="LossContingencyPartyDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_MaximumCommercialPaperBorrowingAuthority" name="MaximumCommercialPaperBorrowingAuthority" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_MultiCurrencyRevolvingCreditAgreementMember" name="MultiCurrencyRevolvingCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_NewAccountingPronouncementsAxis" name="NewAccountingPronouncementsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_NewAccountingPronouncementsDomain" name="NewAccountingPronouncementsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_NotedToCondensedConsolidatedFinancialStatementsAbstract" name="NotedToCondensedConsolidatedFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes1800Due2017Member" name="Notes1800Due2017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes3100Due2022Member" name="Notes3100Due2022Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes4500Due2020Member" name="Notes4500Due2020Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes4500Due2042Member" name="Notes4500Due2042Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes4875Due2015Member" name="Notes4875Due2015Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes4875Due2020Member" name="Notes4875Due2020Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes5375Due2017Member" name="Notes5375Due2017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes5400Due2035Member" name="Notes5400Due2035Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes5700Due2040Member" name="Notes5700Due2040Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes6050Due2036Member" name="Notes6050Due2036Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes6125Due2019Member" name="Notes6125Due2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes6125Due2038Member" name="Notes6125Due2038Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes6290Due2016Member" name="Notes6290Due2016Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes6700Due2028Member" name="Notes6700Due2028Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes6800Due2018Member" name="Notes6800Due2018Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes6800Due2036Member" name="Notes6800Due2036Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes7000Due2038Member" name="Notes7000Due2038Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes7100Due2027Member" name="Notes7100Due2027Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes7500Due2029Member" name="Notes7500Due2029Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes8750Due2021Member" name="Notes8750Due2021Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_Notes8875Due2019Member" name="Notes8875Due2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_NotesAndLeasesReceivableFinancingReceivableMember" name="NotesAndLeasesReceivableFinancingReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_NotesToCondensedConsolidatedFinancialStatementsAbstract" name="NotesToCondensedConsolidatedFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_OperatingProfitMargin" name="OperatingProfitMargin" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditAndNetTransitionAssetObligationBeforeTax" name="OtherComprehensiveIncomeLossAmortizationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditAndNetTransitionAssetObligationBeforeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_OtherLongTermDebtFairMarketValueAdjustments" name="OtherLongTermDebtFairMarketValueAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="utx_OtherLongTermLiabilitiesFairValueDisclosure" name="OtherLongTermLiabilitiesFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_OtisMember" name="OtisMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_PatentsAndTrademarksMember" name="PatentsAndTrademarksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_PercentageLongTermReceivablesHighCreditRisk" name="PercentageLongTermReceivablesHighCreditRisk" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_PrattAndWhitneyMember" name="PrattAndWhitneyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_PrattandWhitneyRocketdyneMember" name="PrattandWhitneyRocketdyneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_PrincipalLongTermDebt" name="PrincipalLongTermDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_PriorYearActionsMember" name="PriorYearActionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_ProductWarrantyAccrualOther" name="ProductWarrantyAccrualOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrProgramsExcludingGovernment" name="ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrProgramsExcludingGovernment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="utx_ProgressPaymentsNettedAgainstInventoryForLongTermUSGovernmentContractsOrPrograms" name="ProgressPaymentsNettedAgainstInventoryForLongTermUSGovernmentContractsOrPrograms" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAbstract" name="ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeLineItems" name="ReclassificationOutOfAccumulatedOtherComprehensiveIncomeLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_RedeemableNoncontrollingInterestInOtherComprehensiveIncomeLoss" name="RedeemableNoncontrollingInterestInOtherComprehensiveIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_RedeemableNoncontrollingInterestMember" name="RedeemableNoncontrollingInterestMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_RedeemableNoncontrollingInterestinSubsidiariesEarning" name="RedeemableNoncontrollingInterestinSubsidiariesEarning" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_RestructuringAndOtherCostsByLocationInStatementOfOperationsAxis" name="RestructuringAndOtherCostsByLocationInStatementOfOperationsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_RestructuringAndOtherCostsByStatementOfOperationsLocationsDomain" name="RestructuringAndOtherCostsByStatementOfOperationsLocationsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_RestructuringAndRelatedCostExpectedRemaining" name="RestructuringAndRelatedCostExpectedRemaining" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_RestructuringAndRelatedCostsActionsByYearAxis" name="RestructuringAndRelatedCostsActionsByYearAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_RestructuringAndRelatedCostsActionsByYearDomain" name="RestructuringAndRelatedCostsActionsByYearDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_RestructuringReserveSettled" name="RestructuringReserveSettled" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="utx_RestructuringReserveTwoYearsPriorActions" name="RestructuringReserveTwoYearsPriorActions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_RevolvingCreditAgreementMember" name="RevolvingCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_ScheduleOfGuaranteesTextBlock" name="ScheduleOfGuaranteesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_SellingGeneralAndAdministrativeMember" name="SellingGeneralAndAdministrativeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_ShortTermBorrowingsFairValueDisclosure" name="ShortTermBorrowingsFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="utx_SikorskyMember" name="SikorskyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_StatementEquityAndRedeemableNoncontrollingInterestComponentsAxis" name="StatementEquityAndRedeemableNoncontrollingInterestComponentsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_StockholdersEquityAndNoncontrollingInterestDisclosureTextBlock" name="StockholdersEquityAndNoncontrollingInterestDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_TaxDeductionsClaimedInFranceForTaxYears2008Through2010ThatDisallowedByFrenchRevenueAuthority" name="TaxDeductionsClaimedInFranceForTaxYears2008Through2010ThatDisallowedByFrenchRevenueAuthority" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="utx_TemporaryEquityTextBlock" name="TemporaryEquityTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_TopElement00001StatementCondensedConsolidatedStatementOfOperations" name="TopElement00001StatementCondensedConsolidatedStatementOfOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_TopElement00002StatementCondensedConsolidatedBalanceSheet" name="TopElement00002StatementCondensedConsolidatedBalanceSheet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_TopElement00003StatementCondensedConsolidatedStatementOfCashFlows" name="TopElement00003StatementCondensedConsolidatedStatementOfCashFlows" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_TotalSegmentsMember" name="TotalSegmentsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneyMember" name="U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_USAirForceClaimAgainstPrattAndWhitneyrMember" name="USAirForceClaimAgainstPrattAndWhitneyrMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_UTCAerospaceSystemsMember" name="UTCAerospaceSystemsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_UTCClimateControlsAndSecurityMember" name="UTCClimateControlsAndSecurityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="utx_UTCPowerMember" name="UTCPowerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="utx_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets" name="VariableInterestEntityConsolidatedCarryingAmountCurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="utx_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities" name="VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentAssets" name="VariableInterestEntityConsolidatedCarryingAmountNoncurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="utx_VariableInterestEntityConsolidatedCarryingAmountNoncurrentLiabilities" name="VariableInterestEntityConsolidatedCarryingAmountNoncurrentLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
</xsd:schema>
