DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2015-4076;DirectorateIdentifier2015-NE-30-AD]RIN2120-AA64AirworthinessDirectives;Rolls-RoycepicTurbofanEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Noticeofproposedrulemaking(NPRM).[4910-13-P]SUMMARY:Weproposetoadoptanewairworthinessdirective(AD)forcertainRollsRoycepic(RR)RB211-22BandRB211-524turbofanengineswithlow-pressureturbine(LPT)supportrollerbearing,partnumber(PIN)LK30313orPINUL29651,installed.ThisproposedADwaspromptedbyareportofabreachoftheturbinecasingandreleaseofenginedebris.ThisproposedADwouldrequireremovalofcertainLPTsupportrollerbearingsinstalledinRRRB211-22BandRB211-524engines.WeareproposingthisADtopreventfailureoftheLPTsupportrollerbearing,lossofradialpositionfollowingLPTbladefailure,uncontainedpartrelease,damagetotheengine,anddamagetotheairplane.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.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://WW\V.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-4076;orinpersonattheDocketOperationsofficebetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisproposed AD,themandatorycontinuingairworthinessinfonnation(MCAI),theregulatoryevaluation,anycommentsreceived,andotherinfmmation.TheaddressfortheDocketOffice(phone:800-647-5527)isintheADDRESSESsection.CommentswillbeavailableintheADdocketshortlyafterreceipt.FORFURTHERINFORMATIONCONTACT:BrianKierstead,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7772;fax:781-238-7199;email:brian.kierstead@faa.gov.SUPPLEMENTARYINFORMATION:CommentsInvitedWeinviteyoutosendanywrittenrelevantdata,views,orargumentsaboutthisproposedAD.SendyourcommentstoanaddresslistedundertheADDRESSESsection.Include"DocketNo.FAA-2015-4076;DirectorateIdentifier2015-NE-30-AD"atthe2beginningofyourcomments.Wespecificallyinvitecommentsontheoverallregulatory,economic,environmental,andenergyaspectsofthisproposedAD.WewillconsiderallcommentsreceivedbytheclosingdateandmayamendthisproposedADbasedonthosecomments.Wewillpostallcommentswereceive,withoutchange,tohttp://www.regulations.gov,includinganypersonalinformationyouprovide.WewillalsopostareportsummarizingeachsubstantiveverbalcontactwithFAApersmmelconcerningthisproposedAD.DiscussionTheEuropeanAviationSafetyAgency(EASA),whichistheTeclmicalAgentfortheMemberStatesoftheEuropeanCommunity,hasissuedEASAAD2015-0187,datedSeptember9,2015(referredtohereinafteras"theMCAI"),tocorrectanw1safeconditionforthespecifiedproducts.TheMCAIstates:AnRB211-524G2-Tengineexperiencedanin-serviceeventthatresultedinbreachofaturbinecasingandsomereleaseofcoreengine debristhroughaholeintheenginenacelle.TheinvestigationoftheeventdetenninedtheprimarycausetohavebeenfractureandreleaseofaLowPressure(LP)turbinestage2blade.ThebladereleasecausedsecondarydamagetotheLPturbine,producingsignificantout-of-balanceforces.TheeventenginewasfittedwithanLPturbinesupportbearingwheretherollerretentioncageisconstructedfromtwohalvesthatarerivetedtogether.TheLPturbineimbalanceresultedinanoverloadoftheLPturbinesupportbearingandcausedseparationoftheriveted,two-piecerollerretentioncage.RadiallocationoftheLPturbineshaftwaslost,allowingfurtherprogressionoftheeventthatresultedinabreachoftheIPturbinecasing.RRintroducedamodifiedLPTsupportrollerbearingthatcanwithstandgreaterloadswhenanLPTturbinebladereleaseoccurs,therebypreventingLPTrotor3movement.YoumayobtainfurtherinformationbyexaminingtheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-4076.FAA'sDeterminationandRequirementsofThisProposedADThisproducthasbeenapprovedbytheaviationauthorityoftheUnitedKingdom,andisapprovedforoperationintheUnitedStates.PursuanttoourbilateralagreementwiththeEuropeanCommunity,EASAhasnotifiedusoftheunsafeconditiondescribedintheMCAI.Weare proposingthisADbecauseweevaluatedallinformationprovidedbyEASAanddeterminedthetmsafeconditionexistsandislikelytoexistordeveloponotherproductsofthesametypedesign.ThisproposedADwouldrequireremovalfromserviceoftheaffectedLPTsupportbearings.CostsofComplianceWeestimatethatthisproposedADaffects9enginesinstalledonairplanesofU.S.registry.Wealsoestimateitwouldtake0hourstocomplywiththisproposedADsincetheproposedactionsrequiredbytheADwouldbeperformedduringashopvisit,whenmajorengineflangesareseparated,whichrequirestheremovaloftheLPTsuppol,irollerbearing.Therefore,noadditionaltimeisneededtoremoveit.Partswouldcostabout$8,184perengine.Theaveragelaborrateis$85perhour.Basedonthesefigures,weestimatethecostofthisproposedADonU.S.operatorstobe$73,656.AuthorityforThisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator.4"Subtitle

VII: Aviation Programs,"

describes

in more

detail

the scope

of the Agency's authority.

We

are issuing

this rulemaking

under

the authority

described

in "Subtitle

VII, Part

A, Subpart

III, Section

44701: General requirements."

Under

that section, Congress charges

the FAA

with promoting

safe flight

of civil aircraft

in

air commerce

by prescribing

regulations

for practices,

methods,

and procedures

the Administrator

finds necessary

for safety

in

air commerce.

This regulation

is within

the scope

of that authority because

it addresses

an unsafe condition

that

is likely

to exist

or develop

on products identified

in this rulemaking

action. Regulatory

Findings We determined

that

this proposed

AD would

not have federalism implications under Executive

Order

13132.

This proposed

AD would

not have

a substantial

direct effect

on

the States,

on

the relationship

between

the national Govemment

and

the States, or

on

the distribution

of power

and responsibilities

among

the various

levels

of government.

For

the reasons discussed

above,

I certify

this proposed regulation: (1)

Is not

a "significant

regulatory

action"

under Executive

Order

12866, (2)

Is not

a "significant

rule" under

the DOT Regulatory

Policies

and Procedures (44

FR 11034, February

26, 1979), (3) Will

not affect intrastate

aviation

in Alaska

to the extent

that

it justifies making

a regulatory distinction,

and (4) Will

not have

a significant

economic

impact, positive

or negative,

on

a substantial

number

of small entities

under

the criteria

of the Regulatory

Flexibility

Act. 5ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.TheProposedAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAproposestoamend14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.§39.13[Amended]2.TheFAAamends§39.13byaddingthefollowingnewairworthinessdirective(AD):Rolls-Royceplc:DocketNo.FAA-2015-4076;DirectorateIdentifier2015-NE-30-AD.(a)CommentsDueDateWemustreceivecommentsby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsNone.(c)ApplicabilityThisADappliestoRolls-RoycepicRB211-22B-02,RB211-22B(MOD72-8700),RB211-524B-02,RB211-524B-B-02,RB211-524B2-19,RB211-524B2-B-19,RB211-524B3-02,RB211-524B4-02,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,RB211-524G2-19,RB211-6524G3-19, RB211-524-G2-T-19,

RB211-524G3-

T-19, RB211-524H-36,

RB21!-524H2- 19, RB211-524H-T-36,

and RB211-524H2-T-19

turbofan

engines,

all serial numbers, with low-pressure

turbine

(LPT) support

roller bearing,

part nwnber

(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. (e) Actions

and Compliance Comply

with

this

AD within

the compliance

times specified,

unless already

done. At

the next

shop

visit

or within

24 months

after

the effective

date

of this

AD, whichever occurs

first, remove

from service

LPT support

roller bearing,

PIN LK30313

or PIN UL29651,

and replace

with

a part eligible

for installation. (f) Installation

Prohibition After

the effective

date

of this

AD,

do not install

an LPT support

roller bearing, PIN LK30313

or PIN UL29651,

onto

any engine. (g) Definition

For

the purpose

of this

AD,

a "shop

visit"

is defined

as induction

of

an engine

into the shop

for maintenance

involving

the separation

of pairs

of major mating

engine flanges,

except

that

the separation

of engine

flanges

solely

for

the purposes

of transportation

without subsequent

engine maintenance

does

not constitute

an engine

shop visit.

7(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,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7772;fax:781-238-7199;email:brian.kierstead@faa.gov.(2)RefertoMCAIEuropeanAviationSafetyAgencyAD2015-0187,datedSeptember9,2015,formoreinformation.YoumayexaminetheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingitinDocketNo.FAA-2015-4076.IssuedinBurlington,Massachusetts,onDecember2,2015.ColleenM.D'Alessandro,DirectorateManager,Engine&PropellerDirectorate,AircraftCertificationService.8