DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2015-5539;DirectorateIdentifier2015-NE-37-AD]RIN2120-AA64AirworthinessDirectives;TurbomecaS.A.TurboshaftEnginesAGENCY:FederalAviationAdministration(FAA).DOT.ACTION:Noticeofproposedrnlemaking(NPRM).[4910-13-P]SUMMARY:Weproposetoadoptanewairworthinessdirective(AD)forallTurbomecaS.A.Arriel2Eturboshaftengines.ThisproposedADwaspromptedbyreportsoffuelflownon-conformitiesfoundduringacceptancetestsofArriel2Ehydro-mechanicalmeteringunits(HMUs).ThisproposedADwouldrequireremovingthepre-TU193adjustedhigh-pressure/low-pressure(HP/LP)pumpandmeteringvalveassemblyandreplacingitwithapartthatiseligibleforinstallation.ThisproposedADwouldalsorequirereplacingtheconstantdelta-pressure(delta-P)diaphragmofthefuelmeteringvalve.WeareproposingthisADtopreventfailureofthedelta-Pdiaphragm,whichcouldresultinanuncommandedin-flightshutdownanddamagetothehelicopter.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.,40220Tamos,France;phone:33(0)559744000;fax:33(0)559744515.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-5539orinpersonattheDocketOperationsofficebetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisproposedAD,themandatorycontinuingairworthinessinformation(MCAI),theregulatoryevaluation,anycommentsreceived,andotherinfonnation.TheaddressfortheDocketOffice(phone:800-647-5527)isintheADDRESSESsection.CommentswillbeavailableintheADdocketshortlyafterreceipt.FORFURTHERINFORMATIONCONTACT:KyleGustafson,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.SUPPLEMENTARYINFORMATION:CommentsInvitedWeinviteyoutosendanywrittenrelevantdata,views,orargumentsaboutthisNPRM.SendyourcommentstoanaddresslistedundertheADDRESSESsection.Include"DocketNo.FAA-2015-5539;DirectorateIdentifier2015-NE-37-AD"atthebeginningofyourcomments.Wespecificallyinvitecommentsontheoverallregulatory,2economic,envirorunental,andenergyaspectsofthisNPRM.WewillconsiderallcommentsreceivedbytheclosingdateandmayamendthisNPRlvfbasedonthosecomments.Wewillpostallcommentswereceive,withoutchange,tohttp://wWw.regulations.gov,includinganypersonalinformationyouprovide.WewillalsopostareportsummarizingeachsubstantiveverbalcontactwereceiveaboutthisNPRM.DiscussionTheEuropeanAviationSafetyAgency(EASA),whichistheTechnicalAgentfortheMemberStatesoftheEuropeanCommunity,hasissuedEASAAD2015-0213,datedOctober16,2015(referredtohereinafteras"theMCAI"),tocorrectanunsafeconditionforthespecifiedproducts.TheMCAIstates:Fuelflownon-conformitieswerefoundduringreceptiontestsofARRIEL2EHydraulicMechanicalMeteringUnit(1-lMU).Investigationandinstrumentedtestsrevealedinstabilitiesontheadditionalcheckvalve.Theseinstabilitiesleadtohydraulicpulses.AllHMUinstalledonARRlEL2Eand2Nenginescouldpresenttheseinstabilities.Thiscondition,ifnotcorrected,couldleadtolifereductionofthedeltapressurevalvediaphragm,andconsequently,anuncommandedenginepowerincrease,oranuncommimdedinflightshutdown,possiblyresultinginanemergencylanding.ThisproposedADappliestoArriel2Eenginesonly.TherearenoArriel2NenginesinstalledonaircraftofU.S.registry.YoumayobtainfurtherinfonnationbyexaminingtheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-5539.3RelatedServiceInformationTurbomecaS.A.hasissuedMandatoryServiceBulletin(MSB)No.292732193,VersionA,datedJuly16,2015.TheMSBdescribesproceduresforincorporatingmodificationTU193andreplacingtheconstantdelta-Pdiaphragmofthefuelmeteringvalve.ThisserviceinformationisreasonablyavailablebecausetheinterestedpartieshaveaccesstoitthroughtheirnormalcourseofbusinessorbythemeansidentifiedintheADDRESSESsectionofthisNPRM.FAA'sDeterminationandRequirementsofThisProposedADThisproducthasbeenapprovedbytheaviationauthorityofFrance,andisapprovedforoperationintheUnitedStates.PursuanttoourbilateralagreementwiththeEuropeanCommunity,EASAhasnotifiedusoftheunsafeconditiondescribedintheMCAIreferencedabove.WeareproposingthisNPRMbecauseweevaluatedallinformationprovidedbyEASAanddeterminedtheunsafeconditionexistsandislikelytoexistordeveloponotherproductsofthesametypedesign.ThisNPRMwouldrequireremovingthepre-TU193adjustedHP/LPpumpandmeteringvalveassemblyandreplacingitwithapartthatiseligibleforinstallation.ThisNPRMwouldalsorequirereplacingtheconstantdelta-Pdiaphragmofthefuelmeteringvalve.CostsofComplianceWeestimatethatthisproposedADaffects12enginesinstalledonhelicoptersofU.S.registry.Wealsoestimatethatitwouldtakeabout2hoursperenginetocomplywiththisproposedAD.Theaveragelaborrateis$85perhour.Requiredpartscostabout$13,400perengine.Basedonthesefigures,weestimatethecostofthisproposedADonU.S.operatorstobe$162,840.AuthorityforThisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuemlesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator.4"SubtitleVII:AviationPrograms,"describesinmoredetailthescopeoftheAgency'sauthority.Weareissuingthisrulemakingundertheauthoritydescribedin"SubtitleVII,PartA,SubpartIII,Section44701:Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulernakingaction.RegulatoryFindingsWedetermined thatthisproposedADwouldnothavefederalismimplicationsunderExecutiveOrder13132.ThisproposedADwouldnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalGovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgoverrunent.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.5TheProposedAmendmentAccordingly,tmdertheauthoritydelegatedtomebytheAdministrator,theFAAproposestoamend14CFRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g).40113.44701.§39.13[Amended]2.TheFAAamends§39.13byaddingthefollmvingnewairworthinessdirective(AD):TurbomecaS.A.:DocketNo.FAA-2015-5539;DirectorateIdentifier2015-NE-37-AD.(a)CommentsDueDateWemustreceivecommentsby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsNone.(c)ApplicabilityThisADappliestoallTurbomecaS.A.Arriel2Eturboshaftenginesthathaveapre-TU193adjustedhigh-pressure/low-pressure(HP/LP)pumpandmeteringvalveassembly,installed.(d)ReasonThisADwaspromptedbyreportsoffue1flownon-conformitiesfoundduringacceptancetestsofArriel2Ehydro-mechanicalmeteringunits.WeareissuingthisADtopreventfailureoftheconstantdelta-pressure(delta-P)diaphragmofthefuelmeteringvalve,whichcouldresultinanru1commandedin-flightshutdownanddamagetothehelicopter.6(e)ActionsandComplianceComplywiththisADwithinthecompliancetimesspecified,unlessalreadydone.(1)Priortoexceeding880operatinghourssincenewontheadjustedHP/LPpmnpandmeteringvalveassemblyorwithin50operatinghoursaftertheeffectivedateofthisAD,whicheveroccurslater:(i)removefromservicetheadjustedHP/LPpumpandmeteringvalveassemblyandreplacewithapartthatiseligibleforinstallation,and(ii)replace theconstantdiaphragmofthefuelmeteringvalve.(2)Reserved.(f)InstallationProhibitionAftertheeffectivedateofthisAD,donotinstallintoanyengineanyTU193adjustedHP/LPpumpandmeteringvalveassembly,norinstallontoanyhelicopteranyenginethathasapre-TU193adjustedHP/LPpumpandmeteringvalveassembly.(g)AlternativeMethodsofCompliance(AMOCs)TheManager,EngineCertificationOffice,FAA,mayapproveAMOCsforthisAD.Usetheproceduresfoundin14CFR39.19tomakeyourrequest.Youmayemailyourrequestto:ANE-AD-AMOC@faa.gov.(h)RelatedInformation(1)FormoreinformationaboutthisAD,contactKyleGustafson,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7183;fax:781-238-7199;email:kyle.gustafson@faa.gov.(2)RefertoMCAIEuropeanAviationSafetyAgencyAD2015-0213,datedOctober16,2015,formoreinfommtion.YoumayexaminetheMCAIintheADdocketontheInternetathttp://WW\V.regulations.govbysearchingforandlocatingitinDocketNo.FAA-2015-5539.7(3) Turbomeca

S.A. Mandatory

Service Bulletin

No.

292

73 2193, Version

A, dated

July

16, 2015,

can

be obtained

from Turbomeca

S.A.,

using

the contact infom1ation in paragraph

(h)(4)

of this proposed

AD. (4) For service infonnation

identified

in this proposed

AD, contact Turbomeca S.A., 40220 Tamos,

France;

phone:

33 (0)5

59

74

40

00;

fax:

33 (0)5

59

74

45

15. (5) You

may

view

this service information

at the FAA, Engine

& Propeller Directorate,

12 New England Executive

Park, Burlington,

J\.1A.

For information

on

the availability

of this material

at the FAA, call781-238-7125. Issued

in Burlington, Massachusetts,

on December

18,2015. Atm

C. Mollica, Acting Directorate

Manager,

Engine

& Propeller Directorate, Aircraft Certification

Service.

8