<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:5b27509a-9e7e-46dd-98f5-5e547f7ee381,g:9ccc7a1b-b2e5-4aa1-b531-607818e5c4b3-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:utx="http://www.utc.com/20200331" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.utc.com/20200331">
  <xs:import namespace="http://fasb.org/srt/2019-01-31" schemaLocation="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2017-01-31" schemaLocation="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/currency/2019-01-31" schemaLocation="https://xbrl.sec.gov/currency/2019/currency-2019-01-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2019-01-31" schemaLocation="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20200331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20200331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20200331_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="utx-20200331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="DocumentandEntityInformation" roleURI="http://www.utc.com/role/DocumentandEntityInformation">
        <link:definition>0001001 - 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="CondensedConsolidatedStatementofOperationsCondensedConsolidatedStatementofOperations" roleURI="http://www.utc.com/role/CondensedConsolidatedStatementofOperationsCondensedConsolidatedStatementofOperations">
        <link:definition>1001002 - Statement - Condensed Consolidated Statement of Operations Condensed Consolidated Statement of 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="CondensedConsolidatedStatementofComprehensiveLossIncome" roleURI="http://www.utc.com/role/CondensedConsolidatedStatementofComprehensiveLossIncome">
        <link:definition>1002003 - Statement - Condensed Consolidated Statement of Comprehensive (Loss) 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="CondensedConsolidatedBalanceSheet" roleURI="http://www.utc.com/role/CondensedConsolidatedBalanceSheet">
        <link:definition>1003004 - 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>1004005 - 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="CondensedConsolidatedStatementofChangesinEquityStatement" roleURI="http://www.utc.com/role/CondensedConsolidatedStatementofChangesinEquityStatement">
        <link:definition>1005006 - Statement - Condensed Consolidated Statement of Changes in Equity Statement</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="IntroductiontoNotestoCondensedConsolidatedFinancialStatementsUnauditedIntroduction" roleURI="http://www.utc.com/role/IntroductiontoNotestoCondensedConsolidatedFinancialStatementsUnauditedIntroduction">
        <link:definition>2101101 - Disclosure - Introduction to Notes to Condensed Consolidated Financial Statements (Unaudited) Introduction</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>2102102 - 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="AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsBusinessAcquisitionsDispositionsGoodwillandIntangibleAssetsTables" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsBusinessAcquisitionsDispositionsGoodwillandIntangibleAssetsTables">
        <link:definition>2303301 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets Business Acquisitions, Dispositions, Goodwill and 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="AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsGeneralInformationDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsGeneralInformationDetails">
        <link:definition>2404401 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets (General 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="AcquisitionDispositionsGoodwillandOtherIntangibleAssetsGoodwillDetails" roleURI="http://www.utc.com/role/AcquisitionDispositionsGoodwillandOtherIntangibleAssetsGoodwillDetails">
        <link:definition>2405402 - 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="AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsIntangibleAssetsDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsIntangibleAssetsDetails">
        <link:definition>2406403 - 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="AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsAmortizationExpenseDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsAmortizationExpenseDetails">
        <link:definition>2407404 - 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="AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsProFormaDetails" roleURI="http://www.utc.com/role/AcquisitionsDispositionsGoodwillandOtherIntangibleAssetsProFormaDetails">
        <link:definition>2408405 - Disclosure - Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Pro Forma) (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="EarningsPerShare" roleURI="http://www.utc.com/role/EarningsPerShare">
        <link:definition>2109103 - 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="EarningsPerShareTables" roleURI="http://www.utc.com/role/EarningsPerShareTables">
        <link:definition>2310302 - 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="EarningsPerShareDetails" roleURI="http://www.utc.com/role/EarningsPerShareDetails">
        <link:definition>2411406 - 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="ReceivablesLoansNotesReceivableandOthers" roleURI="http://www.utc.com/role/ReceivablesLoansNotesReceivableandOthers">
        <link:definition>2112104 - Disclosure - Receivables, Loans, Notes Receivable, and Others</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="ReceivablesLoansNotesReceivableandOthersTables" roleURI="http://www.utc.com/role/ReceivablesLoansNotesReceivableandOthersTables">
        <link:definition>2313303 - Disclosure - Receivables, Loans, Notes Receivable, and Others (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="ReceivablesLoansNotesReceivableandOthersDetails" roleURI="http://www.utc.com/role/ReceivablesLoansNotesReceivableandOthersDetails">
        <link:definition>2414407 - Disclosure - Receivables, Loans, Notes Receivable, and Others (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="AccountsReceivableNetScheduleofReceivablesNet" roleURI="http://www.utc.com/role/AccountsReceivableNetScheduleofReceivablesNet">
        <link:definition>2415408 - Disclosure - Accounts Receivable, Net (Schedule of Receivables, Net)</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="AccountsReceivableNetAllowanceforCreditLoss" roleURI="http://www.utc.com/role/AccountsReceivableNetAllowanceforCreditLoss">
        <link:definition>2416409 - Disclosure - Accounts Receivable, Net (Allowance for Credit Loss)</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="ContractAssetsandLiabilitiesNotes" roleURI="http://www.utc.com/role/ContractAssetsandLiabilitiesNotes">
        <link:definition>2117105 - Disclosure - Contract Assets and Liabilities (Notes)</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="RevenueRecognitionContractAssetLiabilityTables" roleURI="http://www.utc.com/role/RevenueRecognitionContractAssetLiabilityTables">
        <link:definition>2318304 - Disclosure - Revenue Recognition Contract Asset &amp; Liability (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="ContractAssetandLiabilityDetails" roleURI="http://www.utc.com/role/ContractAssetandLiabilityDetails">
        <link:definition>2419410 - Disclosure - Contract Asset and Liability (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="Inventory" roleURI="http://www.utc.com/role/Inventory">
        <link:definition>2120106 - Disclosure - Inventory</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="InventoryTables" roleURI="http://www.utc.com/role/InventoryTables">
        <link:definition>2321305 - Disclosure - Inventory (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="InventoryDetails" roleURI="http://www.utc.com/role/InventoryDetails">
        <link:definition>2422411 - Disclosure - Inventory (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>2123107 - 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="BorrowingsandLinesofCreditTables" roleURI="http://www.utc.com/role/BorrowingsandLinesofCreditTables">
        <link:definition>2324306 - 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="BorrowingsandLinesofCreditShortTermBorrowingsDetails" roleURI="http://www.utc.com/role/BorrowingsandLinesofCreditShortTermBorrowingsDetails">
        <link:definition>2425412 - 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="BorrowingandLinesofCreditNarrativeDetails" roleURI="http://www.utc.com/role/BorrowingandLinesofCreditNarrativeDetails">
        <link:definition>2426413 - 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="BorrowingsandLinesofCreditLongTermDebtDetails" roleURI="http://www.utc.com/role/BorrowingsandLinesofCreditLongTermDebtDetails">
        <link:definition>2427414 - 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="BorrowingsandLinesofCreditBorrowingsandlinesofCreditCurrentYearActionsDetails" roleURI="http://www.utc.com/role/BorrowingsandLinesofCreditBorrowingsandlinesofCreditCurrentYearActionsDetails">
        <link:definition>2428415 - Disclosure - Borrowings and Lines of Credit Borrowings and lines of Credit (Current Year Actions) (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="IncomeTaxes" roleURI="http://www.utc.com/role/IncomeTaxes">
        <link:definition>0102108 - Document - 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="IncomeTaxesUnrecognizedTaxBenefitChangesDetails" roleURI="http://www.utc.com/role/IncomeTaxesUnrecognizedTaxBenefitChangesDetails">
        <link:definition>2429416 - Disclosure - Income Taxes (Unrecognized Tax Benefit Changes) (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="IncomeTaxesIncomeTaxExaminationDetails" roleURI="http://www.utc.com/role/IncomeTaxesIncomeTaxExaminationDetails">
        <link:definition>2430417 - Disclosure - Income Taxes Income Tax Examination (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="EmployeeBenefitPlans" roleURI="http://www.utc.com/role/EmployeeBenefitPlans">
        <link:definition>2131109 - 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="EmployeeBenefitPlansTables" roleURI="http://www.utc.com/role/EmployeeBenefitPlansTables">
        <link:definition>2332307 - 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="EmployeeBenefitPlansDetails" roleURI="http://www.utc.com/role/EmployeeBenefitPlansDetails">
        <link:definition>2433418 - 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="RestructuringandOtherCosts" roleURI="http://www.utc.com/role/RestructuringandOtherCosts">
        <link:definition>2134110 - 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="RestructuringandOtherCostsTables" roleURI="http://www.utc.com/role/RestructuringandOtherCostsTables">
        <link:definition>2335308 - 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="RestructuringandOtherCostsDetails" roleURI="http://www.utc.com/role/RestructuringandOtherCostsDetails">
        <link:definition>2436419 - 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="FinancialInstruments" roleURI="http://www.utc.com/role/FinancialInstruments">
        <link:definition>2137111 - 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="FinancialInstrumentsTables" roleURI="http://www.utc.com/role/FinancialInstrumentsTables">
        <link:definition>2338309 - 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="FinancialInstrumentsDetails" roleURI="http://www.utc.com/role/FinancialInstrumentsDetails">
        <link:definition>2439420 - Disclosure - Financial 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="FairValueMeasurements" roleURI="http://www.utc.com/role/FairValueMeasurements">
        <link:definition>2140112 - 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="FairValueMeasurementsTables" roleURI="http://www.utc.com/role/FairValueMeasurementsTables">
        <link:definition>2341310 - 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="FairValueMeasurementsFairValueHierarchyClassificationDetails" roleURI="http://www.utc.com/role/FairValueMeasurementsFairValueHierarchyClassificationDetails">
        <link:definition>2442421 - 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="FairValueMeasurementsCommercialAerospaceFinancingCommitmentsDetails" roleURI="http://www.utc.com/role/FairValueMeasurementsCommercialAerospaceFinancingCommitmentsDetails">
        <link:definition>2443422 - 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="LongTermFinancingReceivables" roleURI="http://www.utc.com/role/LongTermFinancingReceivables">
        <link:definition>2144113 - Disclosure - Long-Term Financing 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="LongTermFinancingReceivablesTables" roleURI="http://www.utc.com/role/LongTermFinancingReceivablesTables">
        <link:definition>2345311 - Disclosure - Long-Term Financing 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="LongTermFinancingReceivablesClassandCreditRiskInformationDetails" roleURI="http://www.utc.com/role/LongTermFinancingReceivablesClassandCreditRiskInformationDetails">
        <link:definition>2446423 - Disclosure - Long-Term Financing 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="LongTermFinancingReceivablesReserveandAdditionalInformationDetails" roleURI="http://www.utc.com/role/LongTermFinancingReceivablesReserveandAdditionalInformationDetails">
        <link:definition>2447424 - Disclosure - Long-Term Financing 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="AccumulatedOtherComprehensiveLoss" roleURI="http://www.utc.com/role/AccumulatedOtherComprehensiveLoss">
        <link:definition>2148114 - Disclosure - Accumulated Other Comprehensive Loss</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="AccumulatedOtherComprehensiveLossTables" roleURI="http://www.utc.com/role/AccumulatedOtherComprehensiveLossTables">
        <link:definition>2349312 - Disclosure - Accumulated Other Comprehensive Loss (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="AccumulatedOtherComprehensiveLossSummaryofChangesinAOCIDetails" roleURI="http://www.utc.com/role/AccumulatedOtherComprehensiveLossSummaryofChangesinAOCIDetails">
        <link:definition>2450425 - Disclosure - Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (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="VariableInterestEntities" roleURI="http://www.utc.com/role/VariableInterestEntities">
        <link:definition>2151115 - Disclosure - Variable Interest Entities</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="VariableInterestEntitiesTables" roleURI="http://www.utc.com/role/VariableInterestEntitiesTables">
        <link:definition>1306313 - Statement - Variable Interest Entities (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="VariableInterestEntitiesDetails" roleURI="http://www.utc.com/role/VariableInterestEntitiesDetails">
        <link:definition>2452426 - Disclosure - Variable Interest Entities (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="Guarantees" roleURI="http://www.utc.com/role/Guarantees">
        <link:definition>2153116 - 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="GuaranteesTables" roleURI="http://www.utc.com/role/GuaranteesTables">
        <link:definition>2354314 - 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="GuaranteesDetails" roleURI="http://www.utc.com/role/GuaranteesDetails">
        <link:definition>2455427 - 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="ContingentLiabilities" roleURI="http://www.utc.com/role/ContingentLiabilities">
        <link:definition>2156117 - 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>2457428 - 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="LeasesNotes" roleURI="http://www.utc.com/role/LeasesNotes">
        <link:definition>2158118 - Disclosure - Leases (Notes)</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="LeasesTables" roleURI="http://www.utc.com/role/LeasesTables">
        <link:definition>2359315 - Disclosure - Leases (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="LeasesDetails" roleURI="http://www.utc.com/role/LeasesDetails">
        <link:definition>2460429 - Disclosure - Leases (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="SegmentFinancialData" roleURI="http://www.utc.com/role/SegmentFinancialData">
        <link:definition>2161119 - 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="SegmentFinancialDataTables" roleURI="http://www.utc.com/role/SegmentFinancialDataTables">
        <link:definition>2362316 - 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="SegmentFinancialDataDetails" roleURI="http://www.utc.com/role/SegmentFinancialDataDetails">
        <link:definition>2463430 - Disclosure - Segment Financial Data (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="RemainingPerformanceObligations" roleURI="http://www.utc.com/role/RemainingPerformanceObligations">
        <link:definition>2164120 - Disclosure - Remaining Performance Obligations</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="RemainingPerformanceObligationsDetails" roleURI="http://www.utc.com/role/RemainingPerformanceObligationsDetails">
        <link:definition>2465431 - Disclosure - Remaining Performance Obligations (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="AccountingPronouncements" roleURI="http://www.utc.com/role/AccountingPronouncements">
        <link:definition>2166121 - 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>2467432 - 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>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="utx_ContractwithCustomerNet" abstract="false" name="ContractwithCustomerNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes7100Due2027Member" abstract="true" name="Notes7100Due2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LineOfCreditOtisMember" abstract="true" name="LineOfCreditOtisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ActuarialGainLossDomain" abstract="true" name="ActuarialGainLossDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Carrier3YearTermLoanDue2023Member" abstract="true" name="Carrier3YearTermLoanDue2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_OtisAndCarrierMember" abstract="true" name="OtisAndCarrierMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_PrattAndWhitneyMember" abstract="true" name="PrattAndWhitneyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CustomerFinancingNotesReceivableFairValueDisclosure" abstract="false" name="CustomerFinancingNotesReceivableFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_DebtExtinguishmentCostsMember" abstract="true" name="DebtExtinguishmentCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3577Due2050Member" abstract="true" name="Notes3577Due2050Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ContractAssetandLiabilityAbstract" abstract="true" name="ContractAssetandLiabilityAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_BusinessSeparationEffectiveDateOfSeparation" abstract="false" name="BusinessSeparationEffectiveDateOfSeparation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:dateItemType"/>
  <xs:element id="utx_Notes2.650Due2026Member" abstract="true" name="Notes2.650Due2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_A175BCreditAgreementCarrierMember" abstract="true" name="A175BCreditAgreementCarrierMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_OtherLongTermLiabilitiesFairValueDisclosure" abstract="false" name="OtherLongTermLiabilitiesFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes2.150Due2030Member" abstract="true" name="Notes2.150Due2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_UTCAerospaceSystemsMember" abstract="true" name="UTCAerospaceSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Goodwilltranslationandotherincreasedecrease" abstract="false" name="Goodwilltranslationandotherincreasedecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_CarrierSeparationMember" abstract="true" name="CarrierSeparationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_RevenueRemainingPerformanceObligationstoberecognizedwithin24months" abstract="false" name="RevenueRemainingPerformanceObligationstoberecognizedwithin24months" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="utx_LiborPlus045FloatingRatesDue2023Member" abstract="true" name="LiborPlus045FloatingRatesDue2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3.950Due2025Member" abstract="true" name="Notes3.950Due2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3362Due2050Member" abstract="true" name="Notes3362Due2050Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes2242Due2025Member" abstract="true" name="Notes2242Due2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ContractwithCustomerLiabilityChange" abstract="false" name="ContractwithCustomerLiabilityChange" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_MaximumCommercialPaperBorrowingAuthority" abstract="false" name="MaximumCommercialPaperBorrowingAuthority" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes1.875Due2026Member" abstract="true" name="Notes1.875Due2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3.700Due2023Member" abstract="true" name="Notes3.700Due2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes4500Due2042Member" abstract="true" name="Notes4500Due2042Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentRTCRaytheonFeesForAdvisoryLegalAccountingServices" abstract="false" name="ProFormaNonrecurringAdjustmentRTCRaytheonFeesForAdvisoryLegalAccountingServices" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_LongTermReceivablesFairValueDisclosure" abstract="false" name="LongTermReceivablesFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes2493Due2027Member" abstract="true" name="Notes2493Due2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3.650Due2023Member" abstract="true" name="Notes3.650Due2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_VariousfederalstateandnonUSstatuteoflimitationsexpirationsandsettlementsMember" abstract="true" name="VariousfederalstateandnonUSstatuteoflimitationsexpirationsandsettlementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes1.250due2023Member" abstract="true" name="Notes1.250due2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_PrincipalLongTermDebt" abstract="false" name="PrincipalLongTermDebt" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes6050Due2036Member" abstract="true" name="Notes6050Due2036Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes1.500Due2019Member" abstract="true" name="Notes1.500Due2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3112Due2040Member" abstract="true" name="Notes3112Due2040Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_AsbestosMatterOtisMember" abstract="true" name="AsbestosMatterOtisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes4.050Due2047Member" abstract="true" name="Notes4.050Due2047Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_FloatingRateNotesDue2020Member" abstract="true" name="FloatingRateNotesDue2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_EURIBORplus0.20floatingratenotesdue2020Member" abstract="true" name="EURIBORplus0.20floatingratenotesdue2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes5700Due2040Member" abstract="true" name="Notes5700Due2040Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LIBORplus0.350floatingratenotesdue2019Member" abstract="true" name="LIBORplus0.350floatingratenotesdue2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_DocumentAndEntityInformationAbstract" abstract="true" name="DocumentAndEntityInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_EliminationsAndOtherMember" abstract="true" name="EliminationsAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_GeneralCorporateExpensesMember" abstract="true" name="GeneralCorporateExpensesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes4500Due2020Member" abstract="true" name="Notes4500Due2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_SalesTypeDomain" abstract="true" name="SalesTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneysecondclaimMember" abstract="true" name="U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneysecondclaimMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentsNet" abstract="false" name="ProFormaNonrecurringAdjustmentsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes8750Due2021Member" abstract="true" name="Notes8750Due2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_A500MTermCreditAgreementMember" abstract="true" name="A500MTermCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CommercialAerospaceMember" abstract="true" name="CommercialAerospaceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3.125Due2027Member" abstract="true" name="Notes3.125Due2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CarrierMember" abstract="true" name="CarrierMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ContractAssetAndLiabilityTable" abstract="true" name="ContractAssetAndLiabilityTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_LongTermReceivablesHighCreditRisk" abstract="false" name="LongTermReceivablesHighCreditRisk" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_A20BRevolvingCreditAgreementMember" abstract="true" name="A20BRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_MilitaryaerospaceMember" abstract="true" name="MilitaryaerospaceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes4.150Due2045MemberMember" abstract="true" name="Notes4.150Due2045MemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3.500Due2027Member" abstract="true" name="Notes3.500Due2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_A2019U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneyDomain" abstract="true" name="A2019U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneyDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3377Due2040Member" abstract="true" name="Notes3377Due2040Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_RemainingPerformanceObligationsAbstract" abstract="true" name="RemainingPerformanceObligationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_Notes3.100Due2021Member" abstract="true" name="Notes3.100Due2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_PriorYearActionsMember" abstract="true" name="PriorYearActionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes5.250Due2019Member" abstract="true" name="Notes5.250Due2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_GermanTaxOfficeAgainstOtiscashpaymentsinprioryearMember" abstract="true" name="GermanTaxOfficeAgainstOtiscashpaymentsinprioryearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_TerminationDate" abstract="false" name="TerminationDate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:dateItemType"/>
  <xs:element id="utx_FourQuarterRollingAverageOfNotionalAmountOfForeignExchangeContractsHedgingForeignCurrencyTransactions" abstract="false" name="FourQuarterRollingAverageOfNotionalAmountOfForeignExchangeContractsHedgingForeignCurrencyTransactions" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes4.350Due2047Member" abstract="true" name="Notes4.350Due2047Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CurrentYearActionsMember" abstract="true" name="CurrentYearActionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_PrimaryGeographicalMarketsDomain" abstract="true" name="PrimaryGeographicalMarketsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_OtisMember" abstract="true" name="OtisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Otis3YearTermLoanDue2023Member" abstract="true" name="Otis3YearTermLoanDue2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_BalanceSheetLocationOperatingLeasesTableTextBlock" abstract="false" name="BalanceSheetLocationOperatingLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_ReclassificationfromOCIcurrentperiodASU201802adoptionimpact" abstract="false" name="ReclassificationfromOCIcurrentperiodASU201802adoptionimpact" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_RestructuringAndRelatedCostsActionsByYearAxis" abstract="true" name="RestructuringAndRelatedCostsActionsByYearAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_TaxSettlementPotentialGainLossNoncash" abstract="false" name="TaxSettlementPotentialGainLossNoncash" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes2056Due2025Member" abstract="true" name="Notes2056Due2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes3.350due2021Member" abstract="true" name="Notes3.350due2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes2293Due2027Member" abstract="true" name="Notes2293Due2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_PatentsAndTrademarksMember" abstract="true" name="PatentsAndTrademarksMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ProductTypeDomain" abstract="true" name="ProductTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes1.950Due2019Member" abstract="true" name="Notes1.950Due2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure" abstract="false" name="LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_RestructuringAndRelatedCostsActionsByYearDomain" abstract="true" name="RestructuringAndRelatedCostsActionsByYearDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_BusinessDispositionAxis" abstract="true" name="BusinessDispositionAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_RevolvingCreditAgreementMember" abstract="true" name="RevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneyMember" abstract="true" name="U.S.DefenseContractManagementAgencyClaimAgainstPrattWhitneyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentAmortizationofacquiredRockwellCollinsintangibleassetsnet" abstract="false" name="ProFormaNonrecurringAdjustmentAmortizationofacquiredRockwellCollinsintangibleassetsnet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_TotalSegmentsMember" abstract="true" name="TotalSegmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CollaborationMember" abstract="true" name="CollaborationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_MultiCurrencyRevolvingCreditAgreementMember" abstract="true" name="MultiCurrencyRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_RemeasurementlossMember" abstract="true" name="RemeasurementlossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_OtisRevolvingCreditAgreementMember" abstract="true" name="OtisRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes2.800Due2022Member" abstract="true" name="Notes2.800Due2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_TwoYearsPriorActionsMember" abstract="true" name="TwoYearsPriorActionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_SegmentReportingDisclosureSalesTypeTextBlockTextBlock" abstract="false" name="SegmentReportingDisclosureSalesTypeTextBlockTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_OtherLongTermDebtFairMarketValueAdjustments" abstract="false" name="OtherLongTermDebtFairMarketValueAdjustments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes2565Due2030Member" abstract="true" name="Notes2565Due2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_OtherComprehensiveIncomeLossASU201802adoptionimpactonDerivativesArisingDuringPeriod" abstract="false" name="OtherComprehensiveIncomeLossASU201802adoptionimpactonDerivativesArisingDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_SharesOfCommonStockDistributedInTheDistribution" abstract="false" name="SharesOfCommonStockDistributedInTheDistribution" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentDeferredRevenueFairValueAdjustment" abstract="false" name="ProFormaNonrecurringAdjustmentDeferredRevenueFairValueAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_EURIBORplus0.15floatingratenotesdue2019Member" abstract="true" name="EURIBORplus0.15floatingratenotesdue2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LineOfCreditCarrierMember" abstract="true" name="LineOfCreditCarrierMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_IncometaxexpenseDomain" abstract="true" name="IncometaxexpenseDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_A10BCreditAgreementMember" abstract="true" name="A10BCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Averageinterestexpenserate" abstract="false" name="Averageinterestexpenserate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentAmortizationofinventoryandfixedassetfairvalueadjustment" abstract="false" name="ProFormaNonrecurringAdjustmentAmortizationofinventoryandfixedassetfairvalueadjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentEliminationOfDeferredCommissionAmortization" abstract="false" name="ProFormaNonrecurringAdjustmentEliminationOfDeferredCommissionAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_ProductTypeAxis" abstract="true" name="ProductTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_OtherComprehensiveIncomeLossASU201802adoptionimpactonforeigncurrencytranslationArisingDuringPeriod" abstract="false" name="OtherComprehensiveIncomeLossASU201802adoptionimpactonforeigncurrencytranslationArisingDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_RaytheonCompanyMember" abstract="true" name="RaytheonCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_GermanTaxOfficeAgainstOtisMember" abstract="true" name="GermanTaxOfficeAgainstOtisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LeasearrangementtypeASC842Axis" abstract="true" name="LeasearrangementtypeASC842Axis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_OperatingProfitMargin" abstract="false" name="OperatingProfitMargin" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="utx_Notes3100Due2022Member" abstract="true" name="Notes3100Due2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_OtherComprehensiveIncomeLossASU201802adoptionimpactonDefinedBenefitPlanArisingDuringPeriod" abstract="false" name="OtherComprehensiveIncomeLossASU201802adoptionimpactonDefinedBenefitPlanArisingDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_PrimaryGeographicalMarketsAxis" abstract="true" name="PrimaryGeographicalMarketsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_A50BRevolvingCreditAgreementMember" abstract="true" name="A50BRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LeasearrangementtypeASC842Domain" abstract="true" name="LeasearrangementtypeASC842Domain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CondensedConsolidatedStatementofEquityAbstract" abstract="true" name="CondensedConsolidatedStatementofEquityAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_Notes4.800Due2043Member" abstract="true" name="Notes4.800Due2043Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CommercialandindustrialnonaerospaceMember" abstract="true" name="CommercialandindustrialnonaerospaceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes6125Due2038Member" abstract="true" name="Notes6125Due2038Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_SupplementalBalanceSheetInformationOperatingLeasesTableTextBlock" abstract="false" name="SupplementalBalanceSheetInformationOperatingLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_Notes4.450Due2038Member" abstract="true" name="Notes4.450Due2038Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ASU201912Member" abstract="true" name="ASU201912Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_UTCClimateControlsAndSecurityMember" abstract="true" name="UTCClimateControlsAndSecurityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_A10BCreditAgreementOtisMember" abstract="true" name="A10BCreditAgreementOtisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes2722Due2030Member" abstract="true" name="Notes2722Due2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes7500Due2029Member" abstract="true" name="Notes7500Due2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_BusinessDispositionDomain" abstract="true" name="BusinessDispositionDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_FactoredReceivablesMember" abstract="true" name="FactoredReceivablesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes2.300Due2022Member" abstract="true" name="Notes2.300Due2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CollinsAerospaceSystemsMember" abstract="true" name="CollinsAerospaceSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentRelatedToOtisAndCarrierSeparation" abstract="false" name="ProFormaNonrecurringAdjustmentRelatedToOtisAndCarrierSeparation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_ContractwithCustomerAssetChange" abstract="false" name="ContractwithCustomerAssetChange" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes5400Due2035Member" abstract="true" name="Notes5400Due2035Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_RevenueFromContractWithCustomerLineItems" abstract="true" name="RevenueFromContractWithCustomerLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_Notes1.150Due2024Member" abstract="true" name="Notes1.150Due2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes4875Due2020Member" abstract="true" name="Notes4875Due2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CarrierRevolvingCreditAgreementMember" abstract="true" name="CarrierRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_COVID19Member" abstract="true" name="COVID19Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes2195UnsecuredUnsubordinated3YearTermLoanDue2023Member" abstract="true" name="Notes2195UnsecuredUnsubordinated3YearTermLoanDue2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ServiceandProductWarrantiesandProductPerformanceGuaranteesAbstract" abstract="true" name="ServiceandProductWarrantiesandProductPerformanceGuaranteesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_FactoredReceivables" abstract="false" name="FactoredReceivables" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_YTDCurrentandPriorYearActionsMember" abstract="true" name="YTDCurrentandPriorYearActionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes7000Due2038Member" abstract="true" name="Notes7000Due2038Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_CarrierOtisSeparationMember" abstract="true" name="CarrierOtisSeparationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LongTermDebtEuroDenominated" abstract="false" name="LongTermDebtEuroDenominated" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentInterestExpenseRelatedToDebtDistributionsAndRaytheonMergerNet" abstract="false" name="ProFormaNonrecurringAdjustmentInterestExpenseRelatedToDebtDistributionsAndRaytheonMergerNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes3.200Due2024Member" abstract="true" name="Notes3.200Due2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LossContingencyInterest" abstract="false" name="LossContingencyInterest" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_Notes8875Due2019Member" abstract="true" name="Notes8875Due2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes6800Due2036Member" abstract="true" name="Notes6800Due2036Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes4.125Due2028Member" abstract="true" name="Notes4.125Due2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Note1.125Due2021Member" abstract="true" name="Note1.125Due2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_OtherMember" abstract="true" name="OtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_RepaymentofDebtDate" abstract="false" name="RepaymentofDebtDate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:dateItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentUtilizationofcontractualcustomerobligation" abstract="false" name="ProFormaNonrecurringAdjustmentUtilizationofcontractualcustomerobligation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_AggregateLineOfCreditFacilityMaximumBorrowingCapacity" abstract="false" name="AggregateLineOfCreditFacilityMaximumBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_CustomerBillingsInExcessOfRevenueRecognized" abstract="false" name="CustomerBillingsInExcessOfRevenueRecognized" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_UnitedStatesMember" abstract="true" name="UnitedStatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_SalesTypeAxis" abstract="true" name="SalesTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_LongTermTradeAccountsReceivableFinancingReceivableMember" abstract="true" name="LongTermTradeAccountsReceivableFinancingReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_AsbestosMatterCarrierMember" abstract="true" name="AsbestosMatterCarrierMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_AsbestosMatterMember" abstract="true" name="AsbestosMatterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_InternationalAeroEnginesAGMember" abstract="true" name="InternationalAeroEnginesAGMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Portfolioseparationcosts" abstract="false" name="Portfolioseparationcosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes1923Due2023Member" abstract="true" name="Notes1923Due2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ScheduleofWeightedaverageinterestratesTableTextBlock" abstract="false" name="ScheduleofWeightedaverageinterestratesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_ReclassificationtoRetainedEarningscurrentperiodASU201802adoptionimpact" abstract="false" name="ReclassificationtoRetainedEarningscurrentperiodASU201802adoptionimpact" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_ProFormaNonrecurringAdjustmentAdjustmenttonetperiodicpensioncost" abstract="false" name="ProFormaNonrecurringAdjustmentAdjustmenttonetperiodicpensioncost" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_AverageYearsofMaturityofLongTermDebt" abstract="false" name="AverageYearsofMaturityofLongTermDebt" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="utx_BusinessAcquisitionUTCstockpayableshares" abstract="false" name="BusinessAcquisitionUTCstockpayableshares" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="utx_Notes3.750Due2046Member" abstract="true" name="Notes3.750Due2046Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_ActuarialGainLossAxis" abstract="true" name="ActuarialGainLossAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="utx_InternationalAeroEnginesLLCMember" abstract="true" name="InternationalAeroEnginesLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_TaxSettlementGainLossNoncash" abstract="false" name="TaxSettlementGainLossNoncash" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_RemainingPerformanceObligationTextBlock" abstract="false" name="RemainingPerformanceObligationTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_ScheduleofSegmentReportingInformationbyGeographicMarketsTableTextBlock" abstract="false" name="ScheduleofSegmentReportingInformationbyGeographicMarketsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_Commercialpapereurodenominated" abstract="false" name="Commercialpapereurodenominated" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes4.625Due2048Member" abstract="true" name="Notes4.625Due2048Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_AcquisitionCostOfAcquiredEntitiesAndInterestInAffiliates" abstract="false" name="AcquisitionCostOfAcquiredEntitiesAndInterestInAffiliates" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_Notes1.500notes2019Member" abstract="true" name="Notes1.500notes2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_SupplementaloperatingleasecashflowinformationTableTextBlock" abstract="false" name="SupplementaloperatingleasecashflowinformationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_Notes2.800Due2024Member" abstract="true" name="Notes2.800Due2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes1.900Due2020Member" abstract="true" name="Notes1.900Due2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LIBORplus0.650floatingratenotesdue2021Member" abstract="true" name="LIBORplus0.650floatingratenotesdue2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes1.950Due2021Member" abstract="true" name="Notes1.950Due2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_NoncontrollingInterestIncreasefromCapitalContributions" abstract="false" name="NoncontrollingInterestIncreasefromCapitalContributions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="utx_NotesAndLeasesReceivableFinancingReceivableMember" abstract="true" name="NotesAndLeasesReceivableFinancingReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_Notes6700Due2028Member" abstract="true" name="Notes6700Due2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_SegmentReportingDisclosureProductTypeTextBlock" abstract="false" name="SegmentReportingDisclosureProductTypeTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="utx_LIBORPlus1125BpsFloatingRateTermLoanDue2023Member" abstract="true" name="LIBORPlus1125BpsFloatingRateTermLoanDue2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="utx_LossContingencyInterestPaid" abstract="false" name="LossContingencyInterestPaid" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
</xs:schema>
