DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[4910-13-P](DocketNo.FAA-2015-3713;DirectorateIdentifier2015-NE-23-AD;Amendment39-18425;AD2016-05-07]R1N2120-AA64AirworthinessDirectives;EngineAllianceTurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Finalrule.SUMMARY:Weareadoptinganewairworthinessdirective(AD)forcertainEngineAlliance(EA)GP7270turbofanengines.ThisADwaspromptedbyreportsoftheinstallationofnon-conforminghoneycombcartridgesinthehigh-pressurecompressor(HPC)adjacenttotheHPCrotorstage2to5spoolandstage7to9spool.ThisADrequiresremovalandreplacementoftheaffectedHPCrotorstage2to5andstage7to9spoolsandadjacenthoneycombcartridges.WeareissuingthisADtopreventfailureoftheHPCrotorstage2to5andstage7to9spools,whichcouldleadtoWlcontainedenginefailureanddamagetotheairplane.DATES:ThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].ADDRESSES:ForserviceinformationidentifiedinthisAD,contactEngineAlliance,400MainSt.,EastHartford,CT06108,MIS169-10,phone:800-565-0140;email:help24@pw.utc.com;website:www.engineallianceportal.com.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA.ForinfonnationontheavailabilityofthismaterialattheFAA,call781-238-7125.ItisalsoavailableontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-3713.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://WVofW.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-3713;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisAD,theregulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocketOffice(phone:800-647-5527)isDocumentManagementFacility,U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomW12-140,1200NewJerseyAvenueSE.,Washington,DC20590.FORFURTHERINFORMATIONCONTACT:KyleGustafson,AerospaceEngineer,Engine&PropellerDirectorate,FAA,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.SUPPLEMENTARYINFORMATION:DiscussionWeissuedanoticeofproposedrulemaking(NPRM)toamend14CFRpart39byaddinganADthatwouldapplytocertainEAGP7270turbofanengines.TheNPRMpublishedintheFederalRegisteronOctober23,2015(80FR64373).TheNPRMwaspromptedbyreportsoftheinstallationofnon-conforminghoneycombcartridgesinthe1-IPCadjacenttothe1-IPCrotor stage2to5spoolandstage7to9spool.TheNPRMproposedtorequireremovalandreplacementoftheaffected1-IPCrotorstage2to5andstage7to9spoolsandadjacenthoneycombcartridges.WeareissuingthisADtocorrecttheunsafeconditionontheseproducts.RelatedServiceInformationunder1CFRpart51WereviewedEAServiceBulletin(SB)No.EAGP7-72-327,datedJuly21,2015;andSBNo.EAGP7-72-328,datedJuly21,2015.TheSBsdescribeproceduresforremovalandreplacementoftheaffectedHPCrotorstage2to5spoolsand1-IPCrotor2stage7to9spoolsandadjacenthoneycombcartridges.ThisserviceinformationisreasonablyavailablebecausetheinterestedpartieshaveaccesstoitthroughtheirnormalcourseofbusinessorbythemeansidentifiedintheADDRESSESsectionofthisAD.CommentsWegavethepublictheopportunitytoparticipateindevelopingthisAD.ThefollowingpresentsthecommentsreceivedontheNPRMandtheFAA'sresponsetoeachcomment.SupportfortheNPRM(80FR64373,October23,2015)AcommentersupportstheNPRM(80FR64373,October23,2015).RequesttoChangeApplicabilityEArequestedthatweexpandtheapplicabilitytoincludeGP7272andGP7277turbofanenginesmodels.EAstatedthattheADappliestoGP7272andGP7277turbofanenginesratingsinadditiontoGP7270.Wedisagree.NoGP7272orGP7277turbofanengineshavebeendelivered.NewengineswouldbedeliveredinthecorrectedconfigurationandwouldnotbeimpactedbythisAD.WedidnotchangethisAD.RequesttoChangetheUnsafeConditionStatementEArequestedthatwechangetheunsafeconditionstatementto"WeareissuingthisADtopreventahazardousenginecondition."becausenoenginefailureshaveoccurredinthefieldduetonon-conforminghoneycombcartridges.Wedisagree.TheunsafeconditiondescribestheconditionwearetryingtopreventandisthejustificationforthisAD.Itdoesnotdescribewhathasoccurredinthepast.WedidnotchangethisAD.3RequesttoChangetheSummaryandRelevantServiceInformationParagraphsEArequestedthatweinclude"honeycombcartridges"intheSummaryandRelevantServiceInformationparagraphstoindicatethatthehoneycombcartridgesrequirereplacement.WeagreebecausetheproposedchangemorecompletelydescribestherequirementsofthisAD.WechangedtheSummaryandRelevantServiceInformationparagraphsofthisAD.RequesttoChangetheRelevant ServiceInformation,Applicability,andComplianceParagraphsEArequestedthatwerevisetheRelevantServiceInformation,Applicability,andComplianceparagraphsofthisADtoallowfuturerevisionsoftheapplicableServiceBulletins(SBs).Wedisagree.WeareonlyauthorizedtomandateuseofSBsthatwehavereviewedandwhicharepublished.SincefuturerevisionsofSBsarenotyetpublished,wearenotauthorizedtomandatetheiruse.WedidnotchangethisAD.RequesttoChangetheComplianceParagraphEArequestedthatwereviseComplianceparagraph(e)(l)(ii)ofthisADto"RemoveandreplacethehoneycombcartridgesontheHPCstage5vaneswithaparteligibleforinstallation."EAalsorequestedthatwereviseComplianceparagraph(e)(2)(ii)to"RemoveandreplacethehoneycombcartridgesontheHPCstage6,stage7,andstage8vaneswithaparteligibleforinstallation."Weagree.Wechanged"remove"to"removefromservice"and"seal"to"cartridges"andadded"...withaparteligibleforinstallation"incomplianceparagraphs(e)(l)(ii)and(e)(2)(ii)ofthisAD.4ConclusionWereviewedtherelevantdata,consideredthecommentsreceived,anddeterminedthatairsafetyandthepublicinterestrequireadoptingthisADwiththechangesdescribedpreviously:•AreconsistentwiththeintentthatwasproposedintheNPRM(80FR64373)forcorrectingtheunsafecondition;and•DonotaddanyadditionalburdenuponthepublicthanwasalreadyproposedintheNPRM(80FR64373).WealsodeterminedthatthesechangeswillnotincreasetheeconomicburdenonanyoperatororincreasethescopeofthisAD.CostsofComplianceWeestimatethatthisADaffectszeroenginesinstalledonairplanesofU.S.registry.Theaveragelaborrateis$85perhour.Basedonthesefigures,weestimatethecostofthisADonU.S.operatorstobe$0.AuthorityforthisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator.SubtitleVII:AviationPrograms,describesinmoredetailthescopeoftheAgency'sauthority.WeareissuingthisrulemakingtmdertheauthoritydescribedinSubtitleVII,PartA,SubpartIII,Section44701:"Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.5RegulatoryFindingsThisADwillnothavefederalismimplicationsunderExecutiveOrder13132.ThisADwillnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalgovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,IcertifythatthisAD:(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantrule"underDOTRegulatoryPoliciesandProcedures(44FR11034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnwnberofsmallentitiestmderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.AdoptionoftheAmendmentAccordingly,tmdertheauthoritydelegatedtomebytheAdministrator,theFAAamends14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.§39.13[Amended]2.TheFAAamends§39.13byaddingthefollowingnewairworthinessdirective(AD):2016-05-07EngineAlliance:Amendment39-18425;DocketNo.FAA-2015-3713;DirectorateIdentifier6(a)EffectiveDateThisADiseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsNone.(c)ApplicabilityThisADappliestoEngineAlliance(EA)GP7270turbofanengineswithoneorbothofthefollowinginstalled:(1)Ahigh-pressurecompressor(HPC)rotorstage2to5spool,partnumber(PIN)382-104-807-0,withaserialnumber(SIN)listedinEAServiceBulletin(SB)No.EAGP7-72-327,datedJuly21,2015;or(2)AnHPCrotorstage7to9spool,PIN2031M90G04,203!M90G05,or2031M90G07,withanSINlistedinEASBNo.EAGP7-72-328,datedJuly21,2015.(d)UnsafeConditionThisADwaspromptedbyreportsoftheinstallationofnon-confom1inghoneycombcartridgesintheHPCadjacenttotheHPCrotorstage2to5spoolandstage7to9spool.WeareissuingthisADtopreventfailureoftheHPCrotorstage2to5spoolsandstage7to9spools,whichcouldleadtouncontainedenginefailureanddamagetotheairplane.(e)ComplianceComplywiththisADwithinthecompliancetimesspecified,unlessalreadydone.Within30daysaftertheeffectivedateofthisADorbeforeaccumulating2,100enginecyclessincethelastdisassemblyofthecompressormoduleoftheengine,whicheveroccurslater:7(1)Forengineswithan1-IPCrotorstage2to5spool,PIN382-104-807-0,installedwithanSINlistedinEASBNo.EAGP7-72-327,datedJuly21,2015,dothefollowing:(i)RemovefromservicetheHPCrotorstage2to5spoolandreplacewithaparteligibleforinstallation.(ii)RemovefromservicethehoneycombcartridgesontheHPCstage5vanesandreplacewithpartseligibleforinstallation.(2)ForengineswithanHPCrotorstage7to9spool,PIN2031M90G04,2031M90G05,or2031M90G07installedwithanSINlistedinEASBNo.EAGP7-72-328,datedJuly21,2015,dothefollowing:(i)RemovefromservicetheHPCrotorstage7to9spoolandreplacewithaparteligibleforinstallation.(ii)RemovefromservicethehoneycombcartridgesontheHPCstage6,stage7,andstage8vanesandreplacewithpartseligibleforinstallation.(I)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(g)RelatedInformationFormoreinformationaboutthisAD,contactKyleGustafson,AerospaceEngineer,Engine&PropellerDirectorate,FAA,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.(h)MaterialIncorporatedbyReference(1)TheDirectoroftheFederalRegister approvedtheincorporationbyreference(IBR)oftheserviceinformationlistedinthisparagraphunder5U.S.C.552(a)and1CFRpart5l.8(2)YoumustusethisserviceinformationasapplicabletodotheactionsrequiredbythisAD,unlesstheADspecifiesotherwise.(i)EngineAllianceSBNo.EAGP?-72-327,datedJuly21,2015;andNo.EAGP?-72-328,datedJuly21,2015.(ii)Reserved.(3)ForEngine AllianceserviceinformationidentifiedinthisAD,contactEngineAlliance,400MainSt.,EastHartford,CT06108,MIS169-10,phone:800-565-0140;email:help24@pw.utc.com;website:www.engineallianceportal.com.(4)YoumayviewthisserviceinformationatFAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.(5)YoumayviewthisserviceinformationattheNationalArchivesandRecordsAdministration(NARA).ForinformationontheavailabilityofthismaterialatNARA,call202-741-6030,orgoto:http://vvww.archives.gov/federal-register/cfr/ibrlocations.html.IssuedinBurlington,Massachusetts,onFebruary26,2016ColleenM.D'Alessandro,Manager,Engine&PropellerDirectorate,AircraftCertificationService.9