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  <xs:import namespace="http://fasb.org/us-types/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-types-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://fasb.org/srt-types/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-types-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/sic/2026" schemaLocation="https://xbrl.sec.gov/sic/2026/sic-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cyd-af/2026" schemaLocation="https://xbrl.sec.gov/cyd/2026/cyd-af-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd-sub/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-sub-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei-sub/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-sub-2026.xsd"/>
  <xs:element name="ScheduleOfDisaggregatedRevenueByGeographicalLocationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfDisaggregatedRevenueByGeographicalLocationAbstract"/>
  <xs:element name="ScheduleOfDisaggregatedRevenueByIndustryAsAPercentageOfTotalRevenueAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfDisaggregatedRevenueByIndustryAsAPercentageOfTotalRevenueAbstract"/>
  <xs:element name="ScheduleOfPropertyPlantAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfPropertyPlantAndEquipmentAbstract"/>
  <xs:element name="ScheduleOfOtherCurrentLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfOtherCurrentLiabilitiesAbstract"/>
  <xs:element name="ScheduleOfProvisionBenefitForIncomeTaxesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfProvisionBenefitForIncomeTaxesAbstract"/>
  <xs:element name="ScheduleOfChangeInTheCompanySValuationAllowanceAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfChangeInTheCompanySValuationAllowanceAbstract"/>
  <xs:element name="ScheduleOfIncomeTaxesPaidNetAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfIncomeTaxesPaidNetAbstract"/>
  <xs:element name="ScheduleOfUnrecognizedTaxBenefitsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfUnrecognizedTaxBenefitsAbstract"/>
  <xs:element name="ScheduleOfStockOptionActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfStockOptionActivityAbstract"/>
  <xs:element name="SupplementalDisclosuresOfCashFlowInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_SupplementalDisclosuresOfCashFlowInformationAbstract"/>
  <xs:element name="CurrentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_CurrentAbstract"/>
  <xs:element name="DeferredAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_DeferredAbstract"/>
  <xs:element name="NontaxableOrNondeductibleItemsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_NontaxableOrNondeductibleItemsAbstract"/>
  <xs:element name="OtherAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_OtherAbstract"/>
  <xs:element name="RevolvingLineOfCreditTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_RevolvingLineOfCreditTextBlock"/>
  <xs:element name="RecentAccountingStandardNotYetAdoptedPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_RecentAccountingStandardNotYetAdoptedPolicyTextBlock"/>
  <xs:element name="ScheduleOfReconciliationOfTheProvisionForIncomeTaxesTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfReconciliationOfTheProvisionForIncomeTaxesTableTextBlock"/>
  <xs:element name="ScheduleOfIncomeTaxesPaidNetTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_ScheduleOfIncomeTaxesPaidNetTableTextBlock"/>
  <xs:element name="DisaggregateOfRevenuePercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_DisaggregateOfRevenuePercentage"/>
  <xs:element name="DilutiveEffectOfOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_DilutiveEffectOfOptions"/>
  <xs:element name="DeferredTaxAssetsStockOptions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_DeferredTaxAssetsStockOptions"/>
  <xs:element name="DeferredTaxAssetsOperatingLossOperatingRightofuseLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_DeferredTaxAssetsOperatingLossOperatingRightofuseLiability"/>
  <xs:element name="ResearchAndDevelopmentTaxCredits" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_ResearchAndDevelopmentTaxCredits"/>
  <xs:element name="ResearchAndDevelopmentTaxCredit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_ResearchAndDevelopmentTaxCredit"/>
  <xs:element name="HomeOfficeAndEmployeeReimbursements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_HomeOfficeAndEmployeeReimbursements"/>
  <xs:element name="HomeOfficeAndEmployeeReimbursement" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_HomeOfficeAndEmployeeReimbursement"/>
  <xs:element name="IncomeTaxReconciliationNondeductibleExpenseTrueUpOfTaxProvision" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_IncomeTaxReconciliationNondeductibleExpenseTrueUpOfTaxProvision"/>
  <xs:element name="EffectiveIncomeTaxRateReconciliationTrueupOfTaxProvision" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_EffectiveIncomeTaxRateReconciliationTrueupOfTaxProvision"/>
  <xs:element name="IncomeTaxesPaidNetOfRefunds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="iehc_IncomeTaxesPaidNetOfRefunds"/>
  <xs:element name="EquityIncentivePlansScheduleofStockOptionActivityDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_EquityIncentivePlansScheduleofStockOptionActivityDetailsTable"/>
  <xs:element name="SummaryofSignificantAccountingPoliciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_SummaryofSignificantAccountingPoliciesDetailsTable"/>
  <xs:element name="RevolvingLineofCreditDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_RevolvingLineofCreditDetailsTable"/>
  <xs:element name="EquipmentFinancingLineofCreditDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_EquipmentFinancingLineofCreditDetailsTable"/>
  <xs:element name="IncomeTaxesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_IncomeTaxesDetailsTable"/>
  <xs:element name="EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentTaxCredit" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentTaxCredit"/>
  <xs:element name="EquityIncentivePlansDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_EquityIncentivePlansDetailsTable"/>
  <xs:element name="IncentiveStockOptionPercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_IncentiveStockOptionPercentage"/>
  <xs:element name="CommonStockFairMarketValuePercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_CommonStockFairMarketValuePercentage"/>
  <xs:element name="AggregateFairMarketValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_AggregateFairMarketValue"/>
  <xs:element name="CommitmentsandContingenciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_CommitmentsandContingenciesDetailsTable"/>
  <xs:element name="NYLeaseExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_NYLeaseExpirationDate"/>
  <xs:element name="MonthlyInceptionRent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_MonthlyInceptionRent"/>
  <xs:element name="EscalatedMonthlyRent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="iehc_EscalatedMonthlyRent"/>
  <xs:element name="PALeasesExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_PALeasesExpirationDate"/>
  <xs:element name="ConcentrationsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="iehc_ConcentrationsDetailsTable"/>
  <xs:element name="CommercialAerospaceMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_CommercialAerospaceMember"/>
  <xs:element name="CustomerOneMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_CustomerOneMember"/>
  <xs:element name="CustomersMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_CustomersMember"/>
  <xs:element name="CustomersTwoMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_CustomersTwoMember"/>
  <xs:element name="DefenseMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_DefenseMember"/>
  <xs:element name="EquipmentFinancingLineOfCreditMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_EquipmentFinancingLineOfCreditMember"/>
  <xs:element name="FederalAndStateJurisdictionMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_FederalAndStateJurisdictionMember"/>
  <xs:element name="JPMorganChaseBankNAMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_JPMorganChaseBankNAMember"/>
  <xs:element name="OtherMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_OtherMember"/>
  <xs:element name="PurchaseBenchmarkMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_PurchaseBenchmarkMember"/>
  <xs:element name="SpaceMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_SpaceMember"/>
  <xs:element name="TwoZeroOneOneEquityIncentivePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_TwoZeroOneOneEquityIncentivePlanMember"/>
  <xs:element name="TwoZeroTwoZeroEquityIncentivePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_TwoZeroTwoZeroEquityIncentivePlanMember"/>
  <xs:element name="VendorConcentrationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_VendorConcentrationRiskMember"/>
  <xs:element name="VendorsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_VendorsMember"/>
  <xs:element name="VendorsOneMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_VendorsOneMember"/>
  <xs:element name="VendorsThreeMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_VendorsThreeMember"/>
  <xs:element name="VendorsTwoMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_VendorsTwoMember"/>
  <xs:element name="WebsiteDevelopmentCostMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_WebsiteDevelopmentCostMember"/>
  <xs:element name="CashBonusPlanAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_CashBonusPlanAbstract"/>
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  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="iehc_DocumentAndEntityInformationAbstract"/>
</xs:schema>
