[4910-13-P]DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2015-0095;DirectorateIdentifier2015-NE-01-AD;Amendment39-18228;AD2015-16-03)RIN2120-AA64AirworthinessDirectives;Rolls-RoycepicTurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Finalrule.SUMMARY:Weareadoptinganewairworthinessdirective(AD)forcertainRollsRoycepic (RR)RB211-524B-02,RB211-524B2-19,RB211-524B3-02,RB211-524B4-02,RB211-524B4-D-02,RB211-524C2-19,RB211-524D4-19,RB211-524D4-39,andRB211-524D4X-19turbofanengines.ThisADrequiresremovingaffectedhigh-pressureturbine (HPT)blades.ThisADwaspromptedbyseveralfailuresofaffectedHPTblades.WeareissuingthisADtopreventfailureoftheHPTblade,whichcouldleadtofailureofoneormoreengines,lossofthrustcontrol,anddamagetotheairplane.DATES:ThisADbecomeseffective[fNSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER).Examining theADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-0095;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisAD,themandatory continuingairworthinessinformation(MCAI),theregulatoryevaluation,anycommentsreceived,andotherinfom1ation.TheaddressfortheDocketOffice(phone:800-647-5527)isDocumentManagementFacility,U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomW12-140,1200NewJerseyAvenueSE.,Washington,DC20590.FORFURTHERINFORMATIONCONTACT:KatherynMalatek,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7747;fax:781-238-7199;email:katheryn.malatek@faa.gov.SUPPLEMENTARYINFORMATION:DiscussionWeissuedanoticeofproposedrulemaking(NPRM)toamend14CFRpart39byaddinganADthatwouldapplytothespecifiedproducts.TheNPRMwaspublishedintheFederalRegisteronApril29,2015(80FR23741).TheNPRMproposedtocorrectanunsafeconditionforthespecifiedproducts.TheMCAIstates:Therewereanumberofpre-MOD/SB72-7730HighPressureTurbine(HPT)bladefailures,withsomeoccurringwithinarelativelyshorttime.EngineeringanalysiscarriedoutbyRRonthoseoccurrencesindicatesthatcertainpre-MOD/SB72-7730blades,PartNumber(PIN)UL32958andPINUL21691(hereafterreferredtoas'affectedHPTblade'),withanaccumulatedlifeof6500flighthours(FH)sincenewormore,haveanincreasedriskofin-servicefailure.Thiscondition,ifnotcorrected,couldleadtoHPTbladefailure,releaseofdebrisandconsequent(partialorcomplete)lossofenginepower,possiblyresultinginreducedcontroloftheaeroplane.2CommentsWegavethepublictheopportunitytoparticipateindevelopingthisAD.WereceivednocommentsontheNPRM(80FR23741,April29,2015).ConclusionWereviewedtheavailabledataanddeterminedthatairsafetyandthepublicinterestrequireadoptingthisADasproposed.CostsofComplianceWeestimatethatthisADaffects6enginesinstalledonairplanesofU.S.registry.Wealsoestimatethatitwilltakeabout4hoursperenginetocomplywiththisAD.Theaveragelaborrateis$85perhour.Pro-ratedcostofrequiredpartsisabout$250,000perengine.Basedonthesefigures,weestimatethecostofthisADonU.S.operatorstobe$1,502,040.AuthorityforThis RulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator."SubtitleVII:AviationPrograms,"describesinmoredetailthescopeoftheAgency'sauthority.Weareissuingthisrulemakingundertheauthoritydescribedin"SubtitleVII,PartA,SubpartIII,Section44701:Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthority3becauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsWedeterminedthatthisADwillnothavefederalismimplicationsunderExecutiveOrder13132.ThisADwillnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalgovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,IcertifythisAD:(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantrule"undertheDOTRegulatoryPoliciesandProcedures(44FR11034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnumberofsmallentitiesunderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.AdoptionoftheAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAamends14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVESl.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.4§39.13[Amended)2.TheFAAamends§ 39.13byaddingthefollowingnewairworthinessdirective(AD):2015-16-03Rolls-Roycepic:Amendment39-18228;DocketNo.FAA-2015-0095;DirectorateIdentifier2015-NE-0l-AD.(a)EffectiveDateThisADbecomeseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsNone.(c)ApplicabilityThisADappliestoallRolls-Royceplc(RR)RB211-524B-02,RB211-524B2-19,RB211-524B3-02,RB211-524B4-02,RB211-524B4-D-02,RB211-524C2-19,RB211-524D4-19,RB211-524D4-39,andRB211-524D4X-19turbofanengineswithhighpressureturbine(HPT)blades,partnumbers(PINs)UL32958andUL21691,installed.(d)ReasonThisADwaspromptedbyseveralfailuresofaffectedHPTblades.WeareissuingthisADtopreventfailureoftheHPTblade,whichcouldleadtofailureofoneormoreengines,lossofthrustcontrol,anddamagetotheairplane.(e)ActionsandComplianceComplywiththisADwithinthecompliancetimesspecified,unlessalreadydone.5AftertheeffectivedateofthisAD,within2monthsorbeforeexceeding6,500flighthourssincefirstinstallationofHPTblades,PINsUL32958andUL21691,onanengine,whicheveroccurslater,removeallaffectedHPTbladesfromservice.(f)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(g)RelatedInformation(1)FormoreinformationaboutthisAD,contactKatherynMalatek,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7747;fax:781-238-7199;email:katheryn.malatek@faa.gov.(2)RefertoMCAIEuropeanAviationSafetyAgencyAD2014-0250,datedNovember19,2014,formoreinformation.YoumayexaminetheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingitinDocketNo.FAA-2015-0095.(h)MaterialIncorporatedbyReferenceNone.[ssuedinBurlington,Massachusetts,onJuly30,2015.AnnC.Mollica,ActingAssistantDirectorateManager,Engine&PropellerDirectorate,AircraftCertificationService.6