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      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:href="atu-20121130_pre.xml" xlink:title="Presentation Links, all"/>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <import namespace="http://fasb.org/us-types/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-types-2012-01-31.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/country/2012-01-31" schemaLocation="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd"/>
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  <element name="BaseRateMember" id="atu_BaseRateMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionDeferredPurchasePrice" id="atu_BusinessAcquisitionDeferredPurchasePrice" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionProFormaInformationLineItems" id="atu_BusinessAcquisitionProFormaInformationLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionProFormaInformationTable" id="atu_BusinessAcquisitionProFormaInformationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CommitmentsAndContingenciesDisclosureLineItems" id="atu_CommitmentsAndContingenciesDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentsAndContingenciesDisclosureTable" id="atu_CommitmentsAndContingenciesDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CrossControlMember" id="atu_CrossControlMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtConversionConvertedRemainingInstrumentAmount" id="atu_DebtConversionConvertedRemainingInstrumentAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentInstallmentsPayment" id="atu_DebtInstrumentInstallmentsPayment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentMaturityYear" id="atu_DebtInstrumentMaturityYear" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtRedemptionPriceAsPercentageOfPrincipal" id="atu_DebtRedemptionPriceAsPercentageOfPrincipal" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredCompensationLiability" id="atu_DeferredCompensationLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsAdditionalInformationAbstract" id="atu_DisclosureAcquisitionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureChangesInCarryingValueOfGoodwillAbstract" id="atu_DisclosureChangesInCarryingValueOfGoodwillAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCondensedConsolidatingBalanceSheetsAbstract" id="atu_DisclosureCondensedConsolidatingBalanceSheetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCondensedConsolidatingStatementsOfCashFlowsAbstract" id="atu_DisclosureCondensedConsolidatingStatementsOfCashFlowsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCondensedConsolidatingStatementsOfEarningsAndComprehensiveIncomeAbstract" id="atu_DisclosureCondensedConsolidatingStatementsOfEarningsAndComprehensiveIncomeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureContingenciesAndLitigationAdditionalInformationAbstract" id="atu_DisclosureContingenciesAndLitigationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtAdditionalInformationAbstract" id="atu_DisclosureDebtAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureEarningsPerShareAdditionalInformationAbstract" id="atu_DisclosureEarningsPerShareAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFairValueMeasurementAdditionalInformationAbstract" id="atu_DisclosureFairValueMeasurementAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFairValueOfFinancialAssetsAndLiabilitiesIncludedInCondensedConsolidatedBalanceSheetAbstract" id="atu_DisclosureFairValueOfFinancialAssetsAndLiabilitiesIncludedInCondensedConsolidatedBalanceSheetAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationAbstract" id="atu_DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureGrossCarryingAmountAndAccumulatedAmortizationOfOtherIntangibleAssetsAbstract" id="atu_DisclosureGrossCarryingAmountAndAccumulatedAmortizationOfOtherIntangibleAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureGuarantorSubsidiariesAdditionalInformationAbstract" id="atu_DisclosureGuarantorSubsidiariesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIncomeTaxesAdditionalInformationAbstract" id="atu_DisclosureIncomeTaxesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureLongTermIndebtednessAbstract" id="atu_DisclosureLongTermIndebtednessAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureProductWarrantyCostsAdditionalInformationAbstract" id="atu_DisclosureProductWarrantyCostsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureProformaResultsOfOperationsAbstract" id="atu_DisclosureProformaResultsOfOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureReconciliationsBetweenBasicAndDilutedEarningsPerShareAbstract" id="atu_DisclosureReconciliationsBetweenBasicAndDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureRestructuringAdditionalInformationAbstract" id="atu_DisclosureRestructuringAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureRollforwardOfAccruedProductWarrantyReserveAbstract" id="atu_DisclosureRollforwardOfAccruedProductWarrantyReserveAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentInformationAdditionalInformationAbstract" id="atu_DisclosureSegmentInformationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfFinancialInformationByReportableSegmentAndProductLineAbstract" id="atu_DisclosureSummaryOfFinancialInformationByReportableSegmentAndProductLineAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DiscountedPresentValueOfFutureMinimumLeasePayments" id="atu_DiscountedPresentValueOfFutureMinimumLeasePayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentDocumentandEntityInformationAbstract" id="atu_DocumentDocumentandEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ElectricalMember" id="atu_ElectricalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EliminationsMember" id="atu_EliminationsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EnergyMember" id="atu_EnergyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EngineeredSolutionsMember" id="atu_EngineeredSolutionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityInEarningsOfSubsidiaries" id="atu_EquityInEarningsOfSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FivePointSixTwoFiveSeniorNotesMember" id="atu_FivePointSixTwoFiveSeniorNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FixedChargeCoverageRatio" id="atu_FixedChargeCoverageRatio" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignCurrencyContractsAssetNetOfLiabilitiesFairValueDisclosure" id="atu_ForeignCurrencyContractsAssetNetOfLiabilitiesFairValueDisclosure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GeneralCoporateMember" id="atu_GeneralCoporateMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GuarantorsMember" id="atu_GuarantorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GuarantorSubsidiariesDisclosureTextBlock" id="atu_GuarantorSubsidiariesDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesLineItems" id="atu_IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesTable" id="atu_IncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="IndefiniteAndFiniteLivedIntangibleAssetsLineItems" id="atu_IndefiniteAndFiniteLivedIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IndefiniteAndFiniteLivedIntangibleAssetsTable" id="atu_IndefiniteAndFiniteLivedIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="IndustrialMember" id="atu_IndustrialMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntangibleAssetsGrossExcludingGoodwill" id="atu_IntangibleAssetsGrossExcludingGoodwill" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntercompanyExpenseIncomeNet" id="atu_IntercompanyExpenseIncomeNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntercompanyLoanActivity" id="atu_IntercompanyLoanActivity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntercompanyPayable" id="atu_IntercompanyPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntercompanyReceivable" id="atu_IntercompanyReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="JeycoPtyLtdMember" id="atu_JeycoPtyLtdMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LandBuildingsAndImprovements" id="atu_LandBuildingsAndImprovements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LeverageRatio" id="atu_LeverageRatio" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LiborRateMember" id="atu_LiborRateMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LineOfCreditFacilityAdditionalExpansionOptionAvailable" id="atu_LineOfCreditFacilityAdditionalExpansionOptionAvailable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MastervoltInternationalHoldingMember" id="atu_MastervoltInternationalHoldingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetEarningsLossFromContinuingOperationsBeforeEquityInEarningsOfSubsidiaries" id="atu_NetEarningsLossFromContinuingOperationsBeforeEquityInEarningsOfSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCompeteAgreementsAndOtherMember" id="atu_NonCompeteAgreementsAndOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonGuarantorsMember" id="atu_NonGuarantorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfTuckInAcquisitionsCompleted" id="atu_NumberOfTuckInAcquisitionsCompleted" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostNetOfTax" id="atu_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossRecognizedInNetPeriodicBenefitCostNetOfTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherProductsMember" id="atu_OtherProductsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="PeriodThreeMember" id="atu_PeriodThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepaymentOfTermLoan" id="atu_RepaymentOfTermLoan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCondensedConsolidatingStatementOfOperationsAndComprehensiveIncomeTableTextBlock" id="atu_ScheduleOfCondensedConsolidatingStatementOfOperationsAndComprehensiveIncomeTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="SeniorCreditFacilityRevolverMember" id="atu_SeniorCreditFacilityRevolverMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="SixPointEightSevenFivePercentSeniorNotesMember" id="atu_SixPointEightSevenFivePercentSeniorNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockHeldInTrust" id="atu_StockHeldInTrust" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionExercisesRelatedTaxBenefitsAndOther" id="atu_StockOptionExercisesRelatedTaxBenefitsAndOther" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="TrademarksAndTradenamesMember" id="atu_TrademarksAndTradenamesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TurotestMedidoresLtdaMember" id="atu_TurotestMedidoresLtdaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VehicleSystemsMember" id="atu_VehicleSystemsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantyLiabilityLineItems" id="atu_WarrantyLiabilityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantyLiabilityTable" id="atu_WarrantyLiabilityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="WeightedAverageCommonSharesOutstandingAbstract" id="atu_WeightedAverageCommonSharesOutstandingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
