DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2015-8257;DirectorateIdentifier2015-NE-36-AD]RIN2120-AA64AirworthinessDirectives;TurbomecaS.A.TurboshaftEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Noticeofproposedrulemaking(NPRM).[4910-13-P]SUMMARY:Weproposetoadoptanewairworthinessdirective(AD)forallTurbomecaS.A.MAKILA2AandMAKILA2A1turboshaftengines.ThisproposedADwaspromptedbytwooccurrencesofcrackinitiationonaferruleofthediffuser.ThisproposedADwouldrequirerepetitivediffuserinspectionsandreplacementofthosediffusersthatfailinspection.WeareproposingthisADtopreventruptureoftheferruleofthediffuser,whichcouldresultinenginefireanddamagetothehelicopter.DATES:WemustreceivecommentsonthisproposedADby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].ADDRESSES:Youmaysendcommentsbyanyofthefollowingmethods:•FederaleRulemakingPortal:Gotohttp://www.regulations.gov.Followtheinstructionsforsubmittingcomments.•Mail:DocketManagementFacility,U.S.DepartmentofTransportation,1200NewJerseyAvenueSE.,WestBuildingGroundFloor,RoomW12-140,Washington,DC20590-0001.•HandDelivery:DelivertoMailaddressabovebetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.•Fax:202-493-2251.ForserviceinformationidentifiedinthisproposedAD,contactTurbomecaS.A.,40220Tarnos,France;phone:(33)0559744000;fax:(33)0559744515.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://W\VW.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-8257;orinpersonattheDocketOperationsofficebetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisproposedAD,themandatorycontinuingairworthinessinformation(MCAI),theregulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocketOffice(phone:800-647-5527)isintheADDRESSESsection.CommentswillbeavailableintheADdocketshortlyafterreceipt.FORFURTHERINFORMATIONCONTACT:BrianKierstead,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;email:brian.kierstead@faa.gov;phone:781-238-7772;fax:781-238-7199.2SUPPLEMENTARYINFORMATION:CommentsInvitedWeinviteyoutosendanywrittenrelevantdata,views,orargumentsaboutthisproposedAD.SendyourcommentstoanaddresslistedundertheADDRESSESsection.Include"DocketNo.FAA-2015-8257;DirectorateIdentifier2015-NE-36-AD''atthebeginningofyourcomments.Wespecificallyinvitecommentsontheoverallregulatory,economic,environmental,andenergyaspectsofthisproposedAD.WewillconsiderallcommentsreceivedbytheclosingdateandmayamendthisproposedADbasedonthosecomments.Wewillpostallcommentswereceive,withoutchange,tohttp://www.regulations.gov,includinganypersonalinformationyouprovide.WewillalsopostareportsummarizingeachsubstantiveverbalcontactwithFAApersonnelconcerningthisproposedAD.DiscussionTheEuropeanAviation SafetyAgency(EASA),whichisthe TechnicalAgentfortheMemberStatesoftheEuropeanCommunity,hasissuedEASAAD2015-0209,datedOctober16,2015(referredtohereinafteras"theMCAI"),tocorrectanunsafeconditionforthespecifiedproducts.TheMCAIstates:Twooccurrencesofcrackinitiationwerereportedonaferruleofdiffuserpartnumber(PIN)0298210100,whichpropagatedandledtotheferrulerupture.Theinvestigationshowsinbothcasesthattherupturedferrulecontactedandpuncturedthemainfuelsupplyline,resultinginafuelleak.Thiscondition,ifnotdetectedandcorrected,couldleadtoanenginefire,consequentlytriggeringanuncommandedengineinflightshutdown,possiblyresultinginanemergencylanding.Promptedbytheseoccurrences,Turbomeca3publishedMandatoryServiceBulletin(MSB)No.298722832toproviderepetitiveinspectioninstructions.ThisproposedADwouldrequirerepetitiveinspectionsoftheaffecteddiffuserandremovalofthosediffusersthatfailtherequiredinspection.Youmayobtainfurtherinformationbyexamining-theMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-8257.RelatedServiceInformationunder1CFRPart51TurbomecaS.A.hasissuedAlertMandatoryServiceBulletin(MSB)No.A298722832,VersionB,datedOctober12,2015.TheAlertMSBdescribesproceduresforrepetitiveinspectionsoftheaffecteddiffuseranddependingonfindings,accomplishmentofthecorrectiveaction(s).TurbomecaS.A.hasissuedServiceBulletin(SB)No.298722833,VersionA,datedJuly29,2015.TheSBidentifiespost-TU52HPgasgeneratormodulesthathavebeenreleasedwithanewferruleafterrepairoroverhaulinaRepairCenter.WhenapplyingAlertMandatoryServiceBulletin(MSB)No.A298722832,itisnecessarytoknowifanHPgasgeneratormodulereleasedbyaRepairCenterisequippedwithanewferrule.ThisserviceinformationisreasonablyavailablebecausetheinterestedpartieshaveaccesstoitthroughtheirnormalcourseofbusinessorbythemeansidentifiedintheADDRESSESsectionofthisNPRM.FAA'sDeterminationandRequirementsofThisProposedADThisproducthasbeenapprovedbytheaviationauthorityofFrance,andisapprovedforoperationintheUnitedStates.Pursuanttoourbilateralagreementwiththe4EuropeanCommunity,EASAhasnotifiedusoftheunsafeconditiondescribedintheMCAIandserviceinformation referencedabove.WeareproposingthisADbecauseweevaluatedallinformationprovidedbyEASAanddeterminedtheunsafeconditionexistsandislikelytoexistordeveloponotherproductsofthesametypedesign.ThisproposedADwouldrequirerepetitiveinspectionsoftheaffecteddiffuseranddependingonfindings,accomplishmentofthecorrectiveaction(s).CostsofComplianceWeestimate thatthisproposedADaffects10enginesinstalledonhelicoptersofU.S.registry.Wealsoestimatethatitwouldtakeabout2hoursperenginetocomplywiththisproposedAD.Theaveragelaborrateis$85perhour.Basedonthesefigures,weestimatethecostofthisproposedADonU.S.operatorstobe$1,700.AuthorityforThisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator."SubtitleVII:AviationPrograms,"describesinmoredetailthescopeoftheAgency'sauthority.Weareissuingthisrulernakingundertheauthoritydescribedin"SubtitleVII,PartA,SubpartIII,Section44701:Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.5RegulatoryFindingsWedeterminedthatthisproposedADwouldnothavefederalismimplicationsunderExecutiveOrder13132.ThisproposedADwouldnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalGovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,Icertifythisproposedregulation:(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantrule"undertheDOTRegulatoryPoliciesandProcedures(44FR11034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnumberofsmallentitiesunderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.TheProposedAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAproposestoamend14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.6§39.13[Amended]2.TheFAAamends§39.13byaddingthefollowingnewairworthinessdirective(AD):TurbomecaS.A.:DocketNo.FAA·2015-8257;DirectorateIdentifier2015-NE-36-AD.(a)CommentsDueDateWemustreceivecommentsby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsNone.(c)ApplicabilityThisADappliestoTurbomecaS.A.MAKILA2AaodMAKILA2Alturboshaftenginemodelswithahigh-pressure(HP)gasgeneratormodule(M03)thathasmodification(mod)TU52installed.(d)ReasonThisADwaspromptedbytwooccurrencesofcrackinitiationonafenuleofthediffuser,whichpropagatedandledtotheferrulerupture.WeareissuingthisADtopreventruptureoftheferruleofthediffuser,whichcouldresultinenginefireanddamagetothehelicopter.(e)ActionsandComplianceComplywiththisADwithinthecompliance timesspecified,unlessalreadydone.(1)Borescopeinspectthecentrifugaldiffuserferrule,partnumber(PIN)0298210100,priortothefemlleaccumulating700hours,timesincenewortimesincereplacementorwithin30hoursfromtheeffectivedateofthisAD,whicheverislater.Use7AccomplishmentInstructions,paragraphs2.4.1through2.4.2.2.1,ofTurbomecaS.A.AlertMandatoryServiceBulletin(MSB)No.298722832,VersionB,datedOctober12,2015,todotheborescopeinspectionsrequiredbythisAD.(2)RepeattheborescopeinspectionrequiredbythisADevery50hourssincelastinspection.(3)Ifanycrack,lossofcontactbetweentheferruleanddiffuseraxialvane,oranycontactbetweentheinjectionmanifoldsupplypipeandthediffuserferruleisfound,removethediffusercaseandreplacetheferrulewithaparteligibleforinstallation.(f)CreditforPreviousActionsYoumaytakecreditfortheactionsrequiredbyparagraph(e)ofthisADifyouperformedTurbomecaS.A.MSBNo.298722832,VersionA,datedSeptember3,2015beforetheeffectivedateofthisAD.(g)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(h)RelatedInformation(1)FormoreinformationaboutthisAD,contactBrianKierstead,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7772;fax:781-238-7199;email:brian.kierstead@faa.gov;.(2)RefertoMCAIEuropeanAviationSafetyAgencyAD2015-0209,datedOctober16,2015,formoreinfonnation.YoumayexaminetheMCAIintheADdocket8ontheInternetathttp://www.regulations.govbysearchingforandlocatingitinDocketNo.FAA-2015-8257.(3)TurbomecaS.A.AlertMSBNo.A298722832,VersionB,datedOctober12,2015,canbeobtainedfromTurbomecaS.A.,usingthecontactinformationinparagraph(h)(5)ofthisproposedAD.(4)TurbomecaS.A.ServiceBulletin(SB)No.298722833,VersionA,datedJuly29,2015,canbeobtainedfmmTurbomecaS.A.,usingthecontactinformationinparagraph(h)(5)ofthisproposedAD.(5)ForserviceinformationidentifiedinthisproposedAD,contactTurbomecaS.A.,40220Tarnos,France;phone:(33)0559744000;fax:(33)0559744515.(6)YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.IssuedinBurlington,Massachusetts,onFebruary29,2016.ColleenM.D'Alessandro,Manager,Engine&PropellerDirectorate,AircraftCertificationService.9