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  <xs:element id="sif_ShareTransactionsUnderCompanyStockPlan" abstract="false" name="ShareTransactionsUnderCompanyStockPlan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_IncreaseDecreaseInInterestIncurredButNotYetPaid" abstract="false" name="IncreaseDecreaseInInterestIncurredButNotYetPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_NetCashProvidedByUsedInDiscontinuedOperationsIncludingEffectOfExchangeRateChanges" abstract="false" name="NetCashProvidedByUsedInDiscontinuedOperationsIncludingEffectOfExchangeRateChanges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_SharesIssuedSharesShareBasedPaymentArrangementAfterForfeitureNet" abstract="false" name="SharesIssuedSharesShareBasedPaymentArrangementAfterForfeitureNet" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sif_SharesIssuedValueShareBasedPaymentArrangementAfterForfeitureNet" abstract="false" name="SharesIssuedValueShareBasedPaymentArrangementAfterForfeitureNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_EmployeeRetentionCreditProgramMember" abstract="true" name="EmployeeRetentionCreditProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_ProceedsFromEmployeeRetentionCreditRefund" abstract="false" name="ProceedsFromEmployeeRetentionCreditRefund" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_GovernmentAssistanceInterestIncomeIncreaseDecrease" abstract="false" name="GovernmentAssistanceInterestIncomeIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_GovernmentAssistanceCostOfGoodsSoldIncreaseDecrease" abstract="false" name="GovernmentAssistanceCostOfGoodsSoldIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_GovernmentAssistanceSellingGeneralAndAdministrativeExpenseIncreaseDecrease" abstract="false" name="GovernmentAssistanceSellingGeneralAndAdministrativeExpenseIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_GovernmentAssistanceOtherIncomeExpenseIncreaseDecrease" abstract="false" name="GovernmentAssistanceOtherIncomeExpenseIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_GovernmentAssistanceProfessionalFeesExpenseIncreaseDecrease" abstract="false" name="GovernmentAssistanceProfessionalFeesExpenseIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_CBladeMember" abstract="true" name="CBladeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_DisposalGroupIncludingDiscontinuedOperationPercentageDivested" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationPercentageDivested" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sif_DisposalGroupIncludingDiscontinuedOperationEnterpriseValue" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationEnterpriseValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_DisposalGroupIncludingDiscontinuedOperationTransactionExpense" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationTransactionExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_TranslationAdjustmentFunctionalToReportingCurrencyPercentageOfExcessAssets" abstract="false" name="TranslationAdjustmentFunctionalToReportingCurrencyPercentageOfExcessAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sif_OtherTermLoanMember" abstract="true" name="OtherTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_LoanAgreementMember" abstract="true" name="LoanAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_CreditAgreementMember" abstract="true" name="CreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_EDLoanMember" abstract="true" name="EDLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_DebtCovenantPeriodAxis" abstract="true" name="DebtCovenantPeriodAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="sif_DebtCovenantPeriodDomain" abstract="true" name="DebtCovenantPeriodDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_DebtCovenantPeriodOneMember" abstract="true" name="DebtCovenantPeriodOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_DebtCovenantPeriodTwoMember" abstract="true" name="DebtCovenantPeriodTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_DebtInstrumentFeePaid" abstract="false" name="DebtInstrumentFeePaid" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_DebtInstrumentFeePayable" abstract="false" name="DebtInstrumentFeePayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_DebtInstrumentCollateralFeeInstallmentAmount" abstract="false" name="DebtInstrumentCollateralFeeInstallmentAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_DebtInstrumentCovenantFixedChargeCoverageRatio" abstract="false" name="DebtInstrumentCovenantFixedChargeCoverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sif_DebtInstrumentCovenantAvailabilityBlock" abstract="false" name="DebtInstrumentCovenantAvailabilityBlock" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_DefinedBenefitPlanPlanAssetsCashContribution" abstract="false" name="DefinedBenefitPlanPlanAssetsCashContribution" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_TwoThousandAndSixteenLongTermIncentivePlanMember" abstract="true" name="TwoThousandAndSixteenLongTermIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_NumberOfAwardsGranted" abstract="false" name="NumberOfAwardsGranted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sif_CommercialRevenueMember" abstract="true" name="CommercialRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_MilitaryRevenueMember" abstract="true" name="MilitaryRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_FixedWingAircraftRevenueMember" abstract="true" name="FixedWingAircraftRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_RotocraftRevenueMember" abstract="true" name="RotocraftRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_CommercialSpaceMember" abstract="true" name="CommercialSpaceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_EnergyComponentsForPowerGenerationUnitsMember" abstract="true" name="EnergyComponentsForPowerGenerationUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_CommercialProductAndOtherRevenueMember" abstract="true" name="CommercialProductAndOtherRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sif_ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance" abstract="false" name="ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_ChangeInContractWithCustomerAssetsRollForward" abstract="true" name="ChangeInContractWithCustomerAssetsRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sif_ContractWithCustomerAssetAdditionalRevenueRecognized" abstract="false" name="ContractWithCustomerAssetAdditionalRevenueRecognized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_ContractWithCustomerAssetAmountsBilledToCustomers" abstract="false" name="ContractWithCustomerAssetAmountsBilledToCustomers" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_ChangeInContractWithCustomerLiabilityRollForward" abstract="true" name="ChangeInContractWithCustomerLiabilityRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sif_ContractWithCustomerLiabilityPaymentsReceivedInAdvanceOfPerformanceObligations" abstract="false" name="ContractWithCustomerLiabilityPaymentsReceivedInAdvanceOfPerformanceObligations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized" abstract="false" name="ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sif_NumberOfReportableSegmentsNotDisclosedFlag" abstract="false" name="NumberOfReportableSegmentsNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sif_ReportableSegmentMember" abstract="true" name="ReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
