DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[4910-13-P][DocketNo.FAA-2015-0277;DirectorateIdentifier2015-NE-05-AD;Amendment39-18262;AD2015-18-04]RIN2120-AA64AirworthinessDirectives;CFMInternationalS.A.TurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Finalrule.SUMMARY:Weareadoptinganewairworthinessdirective(AD)forcertainCFMInternationalS.A.(CFM)CFM56-7BandCFM56-3turbofanengines.ThisADwaspromptedbyareportofanuncommandedin-flightshutdown(IFSD)onaCFMCFM56-7Benginefollowingruptureofthe73-toothgearshaftlocatedintheengineaccessorygearbox(AGB).ThisADrequiresAGE/transfergearbox(TGB)magneticchipdetector(MCD)inspectionoftheaffectedgearshaftsuntilremoval.WeareissuingthisADtopreventfailureofcertainengineAGBgearshafts,whichcouldleadtofailureofoneormoreengines,lossofthrustcontrol,anddamagetotheairplane.DATES:ThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].TheDirectoroftheFederalRegisterapprovedtheincorporationbyreferenceofacertainpublicationlistedinthisADasof[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].ADDRESSES:ForserviceinformationidentifiedinthisAD,contactCFMInternationalInc.,AviationOperationsCenter,1NeumannWay,MIDRoom285,Cincinnati,OH45125;phone:877-432-3272;fax:877-432-3329;email:aviation.fleetsupport@ge.com.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.ItisalsoavailableontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-0277.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-0277;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisAD,theregulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocketOffice(phone:800-647-5527)isDocumentManagementFacility,U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomWI2-140,1200NewJerseyAvenueSE.,Washington,DC20590.FORFURTHERINFORMATIONCONTACT:KyleGustafson,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.SUPPLEMENTARYINFORMATION:DiscussionWeissuedanoticeofproposedrulemaking(NPRM)toamend14CFRpart39byaddinganADthatwouldapplytocertainCFMCFM56-7Bseriesturbofanengines.TheNPRMpublishedintheFederalRegisteronMay1,2015(80FR24856).TheNPRMwaspromptedbyareportofanuncommandedIFSDonaCFMCFM56-7Benginefollowingruptureofthe73-toothgearshaftlocatedintheengineAGB.TheNPRJ\t1proposedtorequireMCDinspectionoftheaffectedgearshaftsuntilremoval.2CommentsWegavethepublictheopportunitytoparticipateindevelopingthisAD.ThefollowingpresentsthecommentsreceivedontheNPRM(80FR24856,MayI,2015)andtheFAA'sresponsetoeachcomment.RequesttoAddCFM56-3EnginestoApplicabilityCFMrequestedthatweaddCFM56-3enginestothisAD,astheCFM56-3enginessharethesame 73-toothand41-toothgearshaftsastheCFM56-7Bengines.Weagree.WerevisedtheapplicabilityofthisADbyaddingCFM56-3engines.RequesttoClarifyDiscussionofIFSDsCFMcommentedthattheNPRM(80FR24856,MayI,2015)incorrectlyindicatedthatmultipleinstancesofuncornrnandedIFSDsoccurredonCFM56-7Benginesfollov..ringruptureofthe73-toothgearsha:ftwhenonlyoneIFSDactuallyoccurred.CFMrequestedthatthisADberevisedtoreflectthatonlyoneIFSDoccurredfollowingruptureofthe73-toothgearsha:ft.Weagree.WerevisedtheSummary,Discussion,andUnsafeConditionsectionsofthisfinalruletoreflecttheoccurrenceofoneIFSDfollowingruptureofthe73-toothgearshaftintheCFM56-7B'sAGB.RequesttoClarifyInspectionRequirementCFMcommentedthattheNPRM(80FR24856,MayI,2015)didnotclearlyspecifythattheMCDinspectionisoftheAGB/TGB.Weagree.WerevisedtheSummaryandtheCompliancesectionsofthisfinalruletoreflectthattherequiredinspectionisan"AGB/TGBMCDinspection."RequesttoClarifyRelevant ServiceInformationCFMrequestedthatwespecifyintheRelevantServiceInformationsectionoftheNPRM(80FR24856,Mayl,2015)thatthereferencedservicebulletins(SBs)describe3the proceduresforremovaloftheaffected73-toothand41-toothgearshaftsandalsolisttheaffectedgearshaftsbyserialnumber(SIN).Wedisagree.ThisADdoesnotincludea"RelevantServiceInformation"section.Weare,however,incorporatingthisSBbyreferenceanditisavailableontheInternetathttp://wv.rw.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-0277.WedidnotchangethisAD.RequesttoClarifyProposedADRequirementsCFMcommentedthattheProposedADRequirementssectionshouldberevisedtobeconsistentwiththecomplianceandmandatoryterminatingactionparagraphsinthisAD.Wedisagree.ThisADincorporateschangesproducedasaresultofthecommentsreceived,aspermittedbytheAdministrativeProceduresAct(APA)(PublicLaw79-404,5U.S.C.§551,et.seq.).TotaketheactionthecomrnentersuggestswouldbecontrarytotheAPA.WedidnotchangethisAD.RequesttoAllowUseofLaterRevisionstoSBsCFMrequestedthatweincludeaprovisioninthisADtoallowforuseoflaterrevisionstoCFMSBNo.CFM56-7BSIB72-0964,RevisionI,datedDecember15,2014,andSBNo.CFM56-7BSIB72-0965,datedDecember16,2014.Wedisagree.WedonotknowthecontentoffuturerevisionsofSBsand,therefore,cannotapprovethembeforepublication.WedidnotchangethisAD.RequesttoReviseDescriptionofLaboratoryAnalysisCFMrequestedwechangethewordingintheCompliancesectionofthisADfrom"particleslabanalysis"to"laboratoryanalysis."Weagree.Theterm"laboratoryanalysis"ismoreaccurate.Werevisedtheterm"particleslabanalysis"toread"laboratoryanalysis"intheCompliancesectionofthisAD.4RequesttoIncludeSerialNumbersofAffectedGearshaftsCFMrequestedthatweincludetheSINsoftheaffected73-toothand41-toothgearshaftsinthisADinsteadofreferencingtheSBs.CFMindicatedthatCFM56-3operatorsmaynothaveaccesstotheCFM56-7BSBs.Wedisagree.OperatorshaveaccesstoCFMSBNo.CFM56-7BSIB72-0964,Revision1,datedDecember15,2014,intheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-0277,orbyrequestingtheSBfromCFM.WedidnotchangethisAD.RequesttoLimitApplicabilitybyEngineSerialNumberSunCountryAirlinesrequestedthattheApplicabilityofthisADbelimitedtoCFM56-7BengineswithengineSINslistedinAppendixAofCFMSBNo.CFM56-7BSIB72-0964andCFM56-7Benginesthathavethe73-toothgearshaftslistedinAppendixBofCFMSBNo.CFM56-7BSIB72-0964installedpost-production.SunCountryAirlinesnotedthattheapplicabilityoftheNPRM(80FR24856,May1,2015)couldbemisconstruedtomeantoincludeallCFM56-7Benginesunlessitisproventhattheydonothavetheaffected73-toothor41-tothgearshafts.Wedisagree.CFMidentifiedtheaffectedpopulationofgearshaftsbygearshaftSINandbytheengineSINonwhichitwasinstalled.However,anaffectedgearshaftmaynowbeinstalledonanenginewithanSINnotlistedinAppendixA.Toaddressthelatterpopulation,thoseengineswithagearshaftthathasbeeninstalledonanunknownengine,weidentifiedtheaffectedpopulationof73-toothand41-toothgearshaftsbygearshaftpartnumberandSIN.WedidnotchangethisAD.RequesttoClarifythatApplicabilityisbyGearshaft SerialNumberDeltaAirLines(Delta)requestedthatweclarifythattheapplicabilityoftheADisbygearshaftS/NratherthanbyengineSIN.5Weagree.WerevisedtheApplicabilityparagraphofthisADtoread:"ThisADappliestoallCFMInternationalS.A.(CFM)CFM56-7BandCFM56-3engineswitha73-toothor41-toothgearshaftinstalledintheaccessorygearbox(AGB),thathasagearshaftserialnumberinAppendixAorAppendixBofCFMServiceBulletin(SB)No.CFM56-7BS/B72-0964,RevisionI,datedDecember15,2014."RequesttoVerifyAffectedGearshaftsHaveBeenRemovedFromServiceandReducetheScopeofApplicabilityDeltarequestedthatweverifywhichgearshaftshavebeenremovedfromservicepertheproposedrequirementsoftheNPRM(80FR24856,MayI,2015).Deltafurtheraskedthatwereducetheapplicabilitytoonlythoseaffectedgearshaftsthatremaininservice.Wedisagree.ThisADwillensurethatallaffectedgearshaftsareremovedfromserviceandthatgearshaftsalreadyremovedfromservicearenotreturnedtoservice.WedidnotchangethisAD.SupportfortheNPRMTheBoeingCompanyandananonymouscommenterexpressedsupportfortheNPRM(80FR24856,May1,2015)asproposed.ConclusionWereviewedtherelevantdata,consideredthecommentsreceived,anddeterminedthatairsafetyandthepublicinterestrequireadoptingthisADwiththechangesdescribedpreviously.WealsodeterminedthatthesechangeswillnotincreasetheeconomicburdenonanyoperatororincreasethescopeofthisAD.RelatedServiceInformationunder1CFRPart51WereviewedCFMSBNo.CFM56-7BSIB72-0964,RevisionI,datedDecember15,2014.Theserviceinformationdescribesproceduresforremovalofaffected73-tooth6and41-toothgearshafts.ThisserviceinformationisreasonablyavailablebecausetheinterestedpartieshaveaccesstoitthroughtheirnormalcourseofbusinessorbythemeansidentifiedintheADDRESSESsectionofthisAD.CostsofComplianceWeestimatethatthisADwillaffectabout67enginesinstalledonairplanesofU.S.registry.Wealsoestimatethatitwilltakeabout1hourperenginetodotheinspectionand8hoursperenginetoreplaceeachaffectedgearshaft.Weestimatethirtysix73-toothgearshaftsandforty41-toothgearshaftswillneedreplacementatacostof$12,480and$7,680perpart,respectively.Theaveragelaborrateis$85perhour.Basedonthesefigures,weestimatethecostofthisADonU.S.operatorstobe$813,855.AuthorityforthisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator.SubtitleVII:AviationPrograms,describesinmoredetailthescopeoftheAgency'sauthority.WeareissuingthisrulemakingundertheauthoritydescribedinSubtitleVII,PartA,SubpartIII,Section44701:"Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsThisADwillnothavefederalismimplicationsWlderExecutiveOrder13132.ThisADwillnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthe7nationalgovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,IcertifythatthisAD:(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantrule"underDOTRegulatoryPoliciesandProcedures(44FR11034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnumberofsmallentitiestmderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.AdoptionoftheAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAamends14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.§39.13[Amended]2.TheFAAamends§39.13byaddingthefollowingnewairworthinessdirective(AD):2015-18-04CFMInternationalS.A.:Amendment39-18262;DocketNo.FAA-2015-0277;DirectorateIdentifier2015-NE-05-AD.(a)EffectiveDateThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].8(b)AffectedADsNone.(c)Applicabili1yThisADappliestoCFMInternationalS.A.(CFM)CFM56-7BandCFM56-3engineswitha73-toothor41-toothgearshaftinstalledintheaccessorygearbox(AGB),thathasagearshaftserialnumberinAppendixAorAppendixBofCFMServiceBulletin(SB)No.CFM56-7BSIB72-0964,RevisionI,datedDecember15,2014.(d)UnsafeConditionThisADwaspromptedbyareportofanuncommandedin-flightshutdownonaCFMCFM56-7Benginefollowingruptureofthe73-toothgearshaftlocatedintheengineAGE.WeareissuingthisADtopreventfailureofcertainAGBgearshafts,whichcouldleadtofailureofoneormoreengines,lossofthrustcontrol,anddamagetotheairplane.(e)ComplianceComplywiththisADwithinthecompliancetimesspecified,unlessalreadydone.(1)InitialAGE/TransferGearbox(TGB)/MagneticChipDetector(MCD)InspectionandAnalysis(i)Foraffected73-toothgearshafts,performanAGB/TGBMCDinspectionwithin250flighthours(FHs)sincelastinspection,within25FHsfromtheeffectivedateofthisAD,orwhenthegearshaftaccumulates3,000FI-lssincenew,whichevercomeslater.(ii)Foraffected41-toothgearshafts,performanAGB/TGBMCDinspectionwithin250FHssincelastinspection,within25FHsfromtheeffectivedateofthisAD,orwhenthegearshaftaccumulates6,000FHssincenew,whichevercomeslater.(iii)Ifanymagneticparticles,includingfuzz,areseen,determinewithlaboratoryanalysisiftheparticlesare73-toothor41-toothgearshaftmaterial.9(iv)Iftheparticlesare73-toothor41-toothgearshaftmaterial,removetheaffectedgearshaft(s)within75FHssincetheAGB/TGBMCDinspection.(2)RepetitiveAGBITGBMCDInspectionandAnalysis(i)Foraffected73-toothgearshafts,performanAGB/TGBMCDinspectionandlaboratoryanalysiswithinevery500FHssincethelastAGB/TGBMCDinspectionuntilaffectedgearshaftisremoved.(ii)Foraffected41-toothgearshafts,performanAGB/TGBMCDinspectionandlaboratoryanalysiswithinevery500FHssincethelastAGB/TGBMCDinspectionuntilaffectedgearshaftisremoved.(iii)Ifanymagneticparticles,includingfuzz,areseen,determinewithlaboratoryanalysisiftheparticlesare73-toothor41-toothgearshaftmateriaL(iv)Iftheparticlesare73-toothor41-toothgearshaftmaterial,removetheaffectedgearshaft(s)within75FHssincetheAGB/TGBMCDinspection.(f)MandatoryTerminatingAction(1)Removetheaffected73-toothgearshaftpriortothegearshaftaccumulating6,000FHssinceneworwithin50FHsaftertheeffectivedateofthisAD,whichevercomeslater.(2)Removetheaffected41-toothgearshaftpriortothegearshaftaccumulating9,000FHssinceneworwithin50FHsaftertheeffectivedateofthisAD,whichevercomeslater.(g)InstallationProhibitionAftertheeffectivedateofthisAD,donotinstallanaffectedgearshaftintoanAGB,10(h)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfonndin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(i)RelatedInformationFormoreinformationaboutthisAD,contactKyleGustafson,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.(j)MaterialIncorporatedbyReference(1)TheDirectoroftheFederalRegisterapprovedtheincorporationbyreference(IBR)oftheserviceinformationlistedinthisparagraphunder5U.S.C.552(a)and1CFRpart51.(2)YoumustusethisserviceinformationasapplicabletodotheactionsrequiredbythisAD,tmlesstheADspecifiesotherwise.(3)ThefollowingserviceinformationwasapprovedforIBRon[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(i)CFMInternationalServiceBulletinNo.CFM56-7BS/B72-0964,Revision1,datedDecember15,2014.(ii)Reserved.(4)ForCFMserviceinformationidentifiedinthisAD,contactCFMInternationalInc.,AviationOperationsCenter,1NeumannWay,MIDRoom285,Cincinnati,OH45125;phone:877-432-3272;fax:877-432-3329;email:aviation.fleetsupport@ge.com.(5)YoumayviewthisserviceinformationatFAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call 781-238-7125.11(6)YoumayviewthisserviceinformationattheNationalArchivesandRecordsAdministration(NARA).ForinformationontheavailabilityofthismaterialatNARA,call202w741w6030,orgoto:http://www.archives.gov/federalwregister/cfr/ibrlocations.htrnl.IssuedinBurlington,Massachusetts,onAugust28,2015.AnnC.Mollica,ActingDirectorateManager,Engine&PropellerDirectorate,AircraftCertificationService.12