DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2010-0219;DirectorateIdentifier2010-NE-14-AD]RIN2120-AA64AitworthinessDirectives;TurbomecaS.A.,TurboshaftEnginesAGENCY:FederalAviationAdministration(FAA),DOT.ACTION:Noticeofproposedrulemaking(NPRM).[4910-13-P]SUMMARY:Weproposetosupersedeairworthinessdirective(AD)2010-11-10thatappliestoallTurbomecaS.A.,AstazouXIVBandXIVHturboshaftengines.AD2010-11-10requiresinspectionofcertainthirdstageturbinewheelsandremovalofanydamagedwheel.ThisADwaspromptedbyareportofathirdstageturbinewheelcrackdetectedduringengineoverhauLThisproposedADwouldexpandthepopulationandfrequencyofrepetitiveinspections.WeareproposingthisADtopreventuncontainedfailureofthethirdstageturbinewheel,whichcouldresultindamagetotheengineanddamagetothehelicopter.DATES:WemustreceivecommentsonthisproposedADby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].ADDRESSES:Youmaysendcomments,usingtheproceduresfoundin14CFR11.43and11.45,byanyofthefollowingmethods:•FederaleRulemakingPortal:Gotohttp://www.regulations.gov.Followtheinstructionsforsubmittingcomments.•Fax:202-493-2251.•Mail:U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomW12-140,1200NewJerseyAvenueSE.,Washington,DC20590.•HandDelivery:DelivertoMailaddressabovebetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.ForserviceinformationidentifiedinthisproposedAD,contactTurbomecaS.A,40220Tarnos,France;phone:(33)0559744000;fax:(33)0559744515.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,:MA.ForinformationontheavailabilityofthismaterialattheFAA,call 781-238-7125.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2010-0219;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisproposedAD,themandatorycontinuingairworthinessinfonnation,regulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocketOffice{phone:800-647-5527)isintheADDRESSESsection.CommentswillbeavailableintheADdocketshortlyafterreceipt.FORFURTHERINFORMATIONCONTACT:ContactBrianKierstead,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7772,fax:781-238-7199;email:brian.kierstead@faa.gov.2SUPPLEMENTARYINFORMATION:CommentsInvitedWeinviteyoutosendanywrittenrelevantdata,views,orargumentsaboutthisproposedAD.Sendyourcommentstom1addresslistedundertheADDRESSESsection.Include"DocketNo.FAA-2010-0219;DirectorateIdentifier2010-NE-14-AD"atthebeginningofyourcomments.Wespecificallyinvitecommentsontheoverallregulatory,economic,environmental,andenergyaspectsofthisproposedAD.WewillconsiderallcommentsreceivedbytheclosingdateandmayamendthisproposedADbecauseofthosecomments.Wewillpostallcommentswereceive,withoutchange,tohttp://www.regulations.gov,includinganypersonalinformationyouprovide.WewillalsopostareportsummarizingeachsubstantiveverbalcontactwereceiveaboutthisproposedAD.DiscussionOnMay19,2010,weissuedAD2010-11-10,Amendment39-16315(75FR30270,JuneI,2010),("AD2010-11-10"),forallTurbomecaS.A.,AstazouXIVBandXIVHturboshaftengines.AD2010-11-10requiresinspectionofcertainthirdstageturbinewheelsandremovalofanydamagedwheel.AD2010-11-10resultedfromEuropeanAviationSafetyAgency(EASA)issuinganADtoidentifyandcorrectanunsafeconditiononTurbomecaengines.WeareissuingthisADtopreventuncontainedfailuresofthethirdstageturbinewheel,whichcouldresultindamagetotheengineanddamagetothehelicopter.3

# Actions

Since

AD **2010~11**



# 10 Was Issued Since

we issued

AD **2010~11~10,**



# Turbomeca

reported

a cracked

third

stage turbine

wheel discovered

during

engine overhaul.

As

a result

of the crack, Turbomeca S.A., expanded

the population

of affected

wheels

and inspection

frequency.

Turbomeca S.A., Mandatory

Service Bulletin

(MSB)

No.

283

72 0804, Version

D, dated

July

24, 2015 addresses

the increased population

and inspection

frequency.

Also,

since

we issued AD 2010-ll-10,

(EASA)

has issued

AD 2015-0211,

dated October

15, 2015,

which supersedes

EASA

AD 2010-0004,

dated January

5, 2010. Related

Service Information

under

1 CFR

Part

51 Turbomeca

S.A.,

has issued

MSB

No.

283

72 0804, Version

D, dated

July

24, 2015.

That

MSB describes procedures

for expanding

the frequency

of repetitive inspections.

This service information

is reasonably

available

because

the interested parties

have access

to

it through

their normal

course

of business

or

by

the means identified

in the ADDRESSES

section

of this NPRM. Other Related

Service Information Turborneca

S.A.,

has issued Service Bulletin

(SB)

No.

283

72 0805, Version

B, dated December

15, 2010.

That

SB describes terminating

action

for

the inspections.

This service information

is reasonably

available

because

the interested

parties

have access

to

it through

their normal

course

of business

or

by

the means identified

in the ADDRESSES section

of this NPRM.



# 4FAA'sDeterminationWeareproposingthisADbecauseweevaluatedalltherelevantinformationanddeterminedtheunsafeconditiondescribedpreviouslyislikelytoexistordevelopinotherproductsofthesametypedesign.ProposedADRequirementsThisproposedADwouldrequireexpandingthefrequencyofrepetitiveinspections.WeareproposingthisADtopreventtmcontainedfailureofthethirdstageturbinewheel,whichcouldresultindamagetotheengine,anddamagetothehelicopter.CostsofComplianceWeestimatethatthisproposedADaffectssevenenginesinstalledonhelicoptersofU.S.registry.Wealsoestimate thatitwouldtakeabout5hoursperenginetocomplywiththisproposedAD.Theaveragelaborrateis$85perhour.Basedonthesefigures,weestimatethecostofthisproposedADonU.S.operatorstobe$2,975.AuthorityforthisRulemaldngTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,Section106,describestheauthorityoftheFAAAdministrator.SubtitleVII,AviationPrograms,describesinmoredetailthescopeoftheAgency'sauthority.WeareissuingthismlemakingundertheauthoritydescribedinSubtitleVII,PartA,SubpartIII,Section44701,"Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthority5becauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsWehavedeterminedthatthisproposedADwouldnothavefederalismimplicationsunderExecutiveOrder13132.ThisproposedADwouldnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalGovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,Icertifythattheproposedregulation:(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:6Authority:49U.S.C.106(g),40113,44701.§39.13[Amended]2.TheFAAamends§39.13byremovingairworthinessdirective(AD)2010-11-10,Amendment39-16315(75FR30270,June1,2010),("AD2010-11-10"),andaddingthefollowingnewAD:TurbomecaS.A.,DocketNo.FAA-20I0-0219DirectorateIdentifier2010-NE-14-AD.(a)CommentsDueDateWemustreceivecommentsby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsThisADsupersedesAD2010-11-10.(c)ApplicabilityThisADappliestoTurbomecaS.A.,AstazouXIVBandXIVHturboshaftengineswiththefollowingpartnumber(PIN)andserialnumber(SIN)thirdstageturbinewheelsthatincorporatemodificationAB173(TurbomecaS.A.,ServiceBulletin(SB)No.283720091)ormodificationAB208(TurbomecaS.A.,SBNo.283720117).ThisADdoesnotapplytothirdstageturbinewheelsthatincorporateTurbornecaSBNo.28372805.(1)Thirdstageturbinewheels,PIN0265257000,allSINs;(2)Thirdstageturbinewheels,PIN0265257020,allSINs;(3)Thirdstageturbinewheels,PIN0265257060,allSINs;7(4)Thirdstageturbinewheels,PIN0265257050,withm1SINlistedinAppendix2.1ofTurbomecaS.A.,MandatoryServiceBulletin(MSB)No.283720804,VersionD,datedJuly24,2015.(d)UnsafeConditionThisADwaspromptedbyareportofathirdstageturbinewheelcrackdetectedduringengineoverhaul.WeareissuingthisADtopreventuncontainedfailureofthethirdstageturbinewheel,whichcouldresultindamagetotheengineanddamagetothehelicopter.(e)ComplianceComplywiththisADwithinthecompliancetimesspecified,unlessalreadydone.(1)PerformadyepenetrantinspectionofthethirdstageturbinewheeLUseparagraph2.4.2.2ofTurbomecaS.A.,MSBNo.283720804,VersionD,datedJuly24,2015,todotheinspection,asfollows:(i)Inspectthirdstageturbinewheelswith300enginecycles(EC)ormoreaccumulatedsincelastinspection,orsincenew,orsincelastoverhaul,orsincerepair,within100ECaftertheeffectivedateofthisAD.(ii)Inspectthirdstageturbinewheelswithlessthan300ECaccumulatedsincelastinspection,orsincenew,orsincelastoverhaul,orsincerepair,within400ECsincelastinspection,orsincenew,orsincelastoverhaul,orsincerepair.(2)RepeattheinspectionrequiredbythisADwithin400ECsincelastinspection.(3)RemovefromserviceanythirdstageturbinewheelsthatfailtheinspectionrequiredbythisAD.8(f)OptionalTerminatingActionApplicationofTurbomecaS.A,SBNo.283720805,VersionB,datedDecember15,2010isterminatingactionfortheinspectionsrequiredbyparagraphs(e)(l)and(e)(2)ofthisAD.(g)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,mayapproveAMOCsforthisAD.Usetheproceduresfmmdin14CFR39.19tomakeyourrequest.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)RefertoMCAIEASAAD2015-0211,datedOctober15,2015,forrelatedinformation.YoumayexaminetheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingitinDocketNo.FAA-2010-0219.(3)TurbomecaS.A.,MSBNo.283720804,VersionD,datedJuly24,2015andTurbomecaS.A,SBNo.283720805,VersionB,datedDecember15,2010,canbeobtainedfromTurbomeca,usingthecontactinformationinparagraph(h)(4)ofthisAD.(4)Forserviceinformationidentifiedinthisproposed AD,contactTurbomecaS.A.,40220Tamas,France;phone:(33)0559744000;fax:(33)0559744515.9(5)YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call 781-238-7125.IssuedinBurlington,Massachusetts,onFebruary26,2016.ColleenM.D'Alessandro,Manager,Engine&PropellerDirectorate,AircraftCertificationService.10