DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[4910-13-P][DocketNo.FAA-2015-4076;DirectorateIdentifier2015-NE-30-AD;Amendment39-18483;AD2016-08-07]RlN2120-AA64AirworthinessDirectives;Rolls-RoycepicTurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Finalrule.SUMMARY:Weareadoptinganewairworthinessdirective(AD)forcertainRollsRoyceplc(RR)RB211-22BandRB211-524turbofanengineswithlow-pressureturbine(LPT)supportrollerbearing,partnumber(PIN)LK30313orPINUL29651,installed.ThisADrequiresremovalofcertainLPTsupportrollerbearingsinstalledinRRRB211-22BandRB211-524engines.ThisADwaspromptedbyareportofabreachoftheturbinecasingandreleaseofenginedebristhroughaholeintheenginenacelle.WeareissuingthisADtopreventfailureoftheLPTsupportrollerbearing,lossofradialpositionfollowingLPTbladefailure,tmcontainedpartrelease,damagetotheengine,anddamagetotheairplane.DATES:ThisADbecomeseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].ADDRESSES:SeetheForFurtherInformationContactsection.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-4076;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisAD,themandatorycontinuingairworthinessinformation(MCAI),theregulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocketOffice(phone:800-647-5527)isDocumentManagementFacility,U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomW12-140,1200NewJerseyAvenueSE.,Washington,DC20590.FORFURTHERINFORMATIONCONTACT:BrianKierstead,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7772;fax:781-238-7199;email:brian.kierstead@faa.gov.SUPPLEMENTARYINFORMATION:DiscussionWeissuedanoticeofproposedrulemaking(NPRM)toamend14CFRpart39byaddinganADthatwouldapplytothespecifiedproducts.TheNPRMwaspublishedintheFederalRegisteronDecember9,2015(80FR76402).TheNPRMproposedtocorrectanunsafeconditionforthespecifiedproducts.TheMCAIstates:AnRB211-524G2-Tengineexperiencedanin-serviceeventthatresultedinbreachofaturbinecasingand·somereleaseofcoreengine debristhroughaholeintheenginenacelle.TheinvestigationoftheeventdeterminedtheprimarycausetohavebeenfractureandreleaseofaLowPressure(LP)turbinestage2blade.ThebladereleasecausedsecondarydamagetotheLPturbine,producingsignificantout-of-balanceforces.TheeventenginewasfittedwithanLPturbinesupportbearingwheretherollerretentioncageisconstructedfromtwohalvesthatarerivetedtogether.TheLPturbineimbalanceresultedinanoverloadoftheLPturbinesupportbearingandcausedseparationoftheriveted,two-piecerollerretentioncage.RadiallocationoftheLPturbineshaftwaslost,allowingfurtherprogressionoftheeventthatresultedinabreachoftheIPturbinecasing.2YoumayobtainfurtherinformationbyexaminingtheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-4076.CommentsWegavethepublictheopportunitytoparticipateindevelopingthisAD.Weconsideredthecommentsreceived.SupportfortheNPRM(80FR76402,December9,2015)BoeingconcurredwiththeNPRM.RequesttoChangeComplianceOrbitalATKandLockheedMartinrequestedthatthecompliancetimebebasedonLPTbladecyclesinsteadofcalendartime.OrbitalATKcitescorrespondencewiththeU.S.Rolls-Roycerepresentativewhorecommendsa15,000cycles-since-new(CSN)durationfortheLPTbladedesignlife.Sincethereisnocalendartimedrivingtheunsafecondition,OrbitalATKbelievesthisisagoodmitigationfactorforlowutilizationrateoperators.OrbitalATKbelievesthatroutineborescopeinspectionsoftheLPTbladesandremovaloftheenginepriortoreachinganLPTbladelimitof15,000CSNoffersanequivalentlevelofsafety.Wepartiallyagree.Weagreethatthefailuremodeofthebearingsupportisnotatime-baseddependency.However,acompliancetimeof24monthsisspecifiedtoallowforashopvisitinterval.WehavedeterminedthatremovaloftheLPTsupportrollerbearingaddressestheunsafecondition.OperatorswithuniquecircmnstancesmayapplyforanalternativemethodofcomplianceusingtheprocedureslistedinthisAD.WedidnotchangethisAD.RequesttoChangeCostsofComplianceLockheedMartinrequestedanadjustmenttotheestimatedcostsofcompliance.Thecoststolowutilizationoperatorswouldbesignificantlyincreasedbyimposingan3unscheduledshopvisitand/orunscheduledengineremoval.AnotherpossiblecontributorforincreasedcostsisthelackofanapprovedrepairstationwithintheUnitedStates.Wepartiallyagree.WedisagreethatnorepairstationsexistwithintheU.S.thatmayperformtheworkrequiredbythisAD.WeagreethatthisADmaydrivelowutilizationoperatorstotheshopfaster.Operatorswithuniquecircumstancesmayapplyforanalternativemethodofcomplianceusingthe procedureslistedinthisAD.WedidnotchangethisAD.ConclusionWereviewedtheavailabledata,includingthecommentsreceived,anddeterminedthatairsafetyandthepublicinterestrequireadoptingthisADasproposed.CostsofComplianceWeestimatethatthisADaffects9enginesinstalledonairplanesofU.S.registry.Wealsoestimateitwilltake0hourstocomplywiththisAD.RemovingtheLPTsupportrollerbearingisrequiredduringashopvisit;therefore,noadditionaltimeisneededforremoval.Requiredpartscostabout$8,184perengine.Theaveragelaborrateis$85perhour.Basedonthesefigures,weestimatethecostofthisADonU.S.operatorstobe$73,656.AuthorityforThisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator."SubtitleVII:AviationPrograms,"describesinmoredetailthescopeoftheAgency'sauthority.Weareissuingthisrulemakingundertheauthoritydescribedin"SubtitleVII,PartA,SubpartIII,Section44701:Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfinds4necessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsWedeterminedthatthisADwillnothavefederalismimplicationsunderExecutiveOrder13132.ThisADwillnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalgovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,IcertifythisAD:(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantrule"m1dertheDOTRegulatoryPoliciesandProcedures(44FR11034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnumberofsmallentitiesunderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.AdoptionoftheAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAamends14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.5§39.13 [Amended] 2. The FAA amends§

39.13

by adding

the following

new airworthiness

directive (AD): 2016-XX-XX

Rolls-Royce

p1c: Amendment

39-18XXX:

Docket

No. FAA-2015-4076; Directorate

Identifier 2015-NE-30-AD. (a) Effective

Date This

AD becomes

effective

[INSERT

DATE

35 DAYS AFTER

DATE

OF PUBLICATION

IN THE FEDERAL REGISTER]. (b) Affected

ADs None. (c) Applicability This

AD applies

to Rolls-Royce

plc RB211-22B-02,

RB211-22B

(MOD

72- 8700), RB211-524B-02, RB211-524B-B-02,

RB211-524B2-19, RB211-524B2-B-l9, Rli211-524B3-02,

RB2ll-524B4-02, RB211-524B4-D-02,

RB211-524C2-19,

RB211- 524C2-B-19, RB211-524D4-19, RB211-524D4-B-19,

RB211-524D4X-19,

RB211- 524D4X-B-19, RB211-524D4-39, RB211-524D4-B-39,

RB211-524G2-l9,

RB211- 524G3-19, RB2ll-524-G2-T-l9,

RB211-524G3-T-19,

RB211-524H-36,

RB211-524H2- 19, RB211-524H-T-36,

and RB211-524H2-T-19

turbofan

engines,

all serial nmnbers, with low-pressure

turbine

(LPT) support

roller bearing,

part number

(PIN) LK30313

or PIN UL29651,

installed. (d) Reason This

AD

was prompted

by

a report

of

a breach

of the turbine

casing

and release

of engine

debris through

a hole

in the engine nacelle.

We

are issuing

this

AD

to prevent failure

of the LPT support

roller bearing,

loss

of radial position following

LPT blade failure, uncontained

part release,

damage

to the engine,

and damage

to the airplane. 6(e)ActionsandComplianceComplywiththisADwithinthecompliancetimesspecified,unlessalreadydone.Atthenextshopvisitorwithin24monthsaftertheeffectivedateofthisAD,whicheveroccursfirst,removefromserviceLPTsupportrollerbearing,PINLK30313orPINUL29651,andreplacewithaparteligibleforinstallation.(f)InstallationProhibitionAftertheeffectivedateofthisAD,donotinstallanLPTsupportrollerbearing,PINLK30313orPINUL29651,ontoanyengine.(g)DefinitionForthepurposeofthisAD,a"shopvisit"isdefinedasinductionofanengineintotheshopformaintenanceinvolvingtheseparationofpairsofmajormatingengineflanges,exceptthattheseparationofengineflangessolelyforthepurposesoftransportationwithoutsubsequentenginemaintenancedoesnotconstituteanengineshopvisit.(h)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(i)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)RefertoMCAIEuropeanAviationSaletyAgencyAD2015-0187,datedSeptember9,2015,formoreinfonnation.YoumayexaminetheMCAIintheADdocket7on

the Internet

at http://www.regulations.gov

by searching

for and locating

it

in Docket No. FAA-2015-4076. (j) Material Incorporated

by Reference None. Issued

in Burlington, Massachusetts,

on April4,

2016. Colleen

M.

D' Alessandro, Manager,

Engine

& Propeller Directorate, Aircraft Certification

Service.

8