DEPARTMENTOFTRANSPORTATIONFederalAviationAdministration14CFRPart39[DocketNo.FAA-2015-3732;DirectorateIdentifier2015-NE-25-AD[RIN2120-AA64[4910-13-P[AirworthinessDirectives;Pratt&WhitneyCanadaCorp.TurbopropEnginesAGENCY:FederalAviationAdministration(FAA).DOT.ACTION:Noticeofproposedrnlemaking(NPRM).SUMMARY:Weproposetoadoptanewairworthinessdirective(AD)forcertainPratt&WhitneyCanadaCorp.(PWC)PT6A-60AG,-65AG,-67AF,and-67AGturbopropengines.ThisproposedADwaspromptedbyincidentsofcorrosionandperforationofthetwo-plyCu-BebellowsinWoodwardfuelcontrolunits(FCUs).ThisproposedADwouldrequireremovingtheWoodwardFCUandinstallinganFCUthatiseligibleforinstallation.WeareproposingthisADtopreventfailureoftheWoodwardFCU,whichcouldleadtofailureoftheengine,in-flightshutdown,andlossofcontroloftheairplane.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. For service information

identified

in this proposed

AD, contact

Pratt

& 

# Whitney Canada

Corp.,

1000 Marie-Victorin,

Longueuil,

Quebec,

Canada,

J4G

lAl; phone:

800- 268-8000;

fax: 450-647-2888;

Web

site: www.pwc.ca.

You

may

view

this service information

at the FAA, Engine

& 

# Propeller Directorate,

12 New England Executive Park, Burlington,

MA.

For information

on the availability

of this material

at the FAA, call781-238-7125. 

# Examining

the

AD Docket You

may examine

the

AD docket

on the Internet

at http://wvvw.regulations.gov

by searching

for

and locating

Docket

No.

F AA-2015-3732;

or

in person

at the Docket Operations

office between

9 a.m.

and

5 p.m., Monday

through

Friday,

except Federal holidays.

The

AD docket contains

this proposed

AD,

the mandatory

continuing airworthiness

information

(MCAI),

the regulatory

evaluation,

any comments

received, and other information.

The address

for

the Docket

Office (phone: 800-647-5527)

is

in the ADDRESSES

section. Comments

will

be available

in the

AD docket

shortly

after receipt. FOR FURTHER INFORMATION

CONTACT:

Besian

Luga, Aerospace

Engineer, Engine Certification

Office,

FAA, Engine

& 

# Propeller Directorate,

12 New England Executive

Park, Burlington,

MA 01803;

phone: 781-238-7750;

fax: 781-238-7199;

email: besian.luga@faa.gov. SUPPLEMENTARY

INFORMATION: 

# Comments

Invited We invite

you

to send

any written relevant

data, views,

or arguments

about

this proposed

AD. Send

your comments

to

an address

listed

under

the ADDRESSES

section. Include "Docket

No. FAA-2015-3732;

Directorate

Identifier 2015-NE-25-AD"

at the beginning

of your comments.

We specifically

invite comments

on

the overall regulatory, economic, environmental,

and energy

aspects

of this NPRM.

We

will consider

all 

# 2commentsreceivedbytheclosingdateandmayamendthisNPRMbasedonthosecomments.Wewillpostallcommentswereceive,withoutchange,tohttp://www.regulations.gov,includinganypersonalinformationyouprovide.WewillalsopostareportsummarizingeachsubstantiveverbalcontactwithFAApersonnelconcerningthisNPRM.DiscussionTheTransportCanadaCivilAviation,whichistheaviationauthorityforCanada,hasissuedCanadaADCF-2015-23,datedJuly23,2015(referredtohereinafteras"theMCAI"),tocorrectanunsafeconditionforthespecifiedproducts.TheMCAIstates:Therehavebeenin-serviceincidentsinvolvingcorrosionandperforationofthetwo-plyCu-BebellowsinWoodwardFuelControlUnits(FCU)fitredtoPT6A-60,-65and-67seriesengines.Incertaininstances,associatedbellowsleakagehasresultedinlossofenginepower,in-flightshutdowns(IFSD)andevenaccidents.Enginesinstalledontheaeroplanesthatareusedforcropdusting,duetotheoperationalenvironment,aremoresusceptibletocorrosiondamagetothesubjectbellows.Lossofenginepowerorshutdowninflightbyitselfusuallyisnotconsideredacatastrophicevent.However,onanaeroplanewithsingleengineinstallation,anenginepowerlossorIFSDatacriticalphaseofflightcouldadverselyaffectthesafeoperationoftheaeroplane.ThisADaffectsthePT6A-60AG,PT6A-65AG,PT6A-67AF,andPT6A-67AGenginemodelsbecausetheyhavetheaffectedWoodwardFCUsinstalled.YoumayobtainfurtherinformationbyexaminingtheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-3732.3RelatedServiceInformationunder1CFRPart51PWChasissuedServiceBulletin(SB)No.PT6A-72-14389,Revision3,datedJanuary27,2011andSBNo.PT6A-72-13473,RevisionI,datedMay26,2015.TheserviceinformationdescribesproceduresforreplacingWoodwardFCUs.ThisserviceinformationisreasonablyavailablebecausetheinterestedpartieshaveaccesstoitthroughtheirnormalcourseofbusinessorbythemeansidentifiedintheADDRESSESsectionofthisNPRM.FAA'sDeterminationandRequirementsofThisProposedADThisproducthasbeenapprovedbytheaviationauthorityofCanada,andisapprovedforoperationintheUnitedStates.PursuanttoourbilateralagreementwithCanada,theyhavenotifiedusoftheunsafeconditiondescribedintheMCAIandserviceinformationreferencedabove.WeareproposingthisADbecauseweevaluatedallinformationprovidedbyTransportCanadaCivilAviationanddeterminedtheunsafeconditionexistsandislikelytoexistordeveloponotherproductsofthesametypedesign.ThisNPRMwouldrequirereplacingtheWoodwardFCU.CostsofComplianceWeestimatethatthisproposedADaffects341enginesinstalledonairplanesofU.S.registry.Wealsoestimatethatitwouldtakeabout1.5hoursperenginetocomplywiththisproposedAD.The averagelaborrateis$85perhour.Requiredpartscostabout$1,000perengine.Basedonthesefigures,weestimatethecostofthisproposedADonU.S.operatorstobe$384,478.AuthorityforThisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator."SubtitleVII:AviationPrograms,"describesinmoredetailthescopeoftheAgency'sauthority.4Weareissuingthisrulemakingundertheauthoritydescribedin"SubtitleVII,PartA,SubpartIII,Section44701:Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsWedetenninedthatthisproposedADwouldnothavefederalismimplicationsunderExecutiveOrder13132.ThisproposedADwouldnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalGovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,Icertifythisproposedregulation:(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantntle"undertheDOTRegulatoryPoliciesandProcedures(44FRII034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnumberofsmallentitiesunderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.TheProposedAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAproposestoamend14CFRpart39asfollows:5PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.§39.13[Amended]2.TheFAAamends§39.13byaddingthefollowingnewairworthinessdirective(AD):Pratt&WhitneyCanadaCorp.(TypeCertificatepreviouslyheldbyPratt&WhitneyCanada,Inc.,Pratt&WhitneyAircraftofCanada,Ltd.,andUnitedAircraftofCanada,Ltd.):DocketNo.FAA-2015-3732;DirectorateIdentifier2015-NE-25-AD.(a)CommentsDueDateWemustreceivecommentsby[INSERTDATE60DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].(b)AffectedADsNone.(c)ApplicabilityThisADappliestoPratt&WhitneyandBS1048withpre-SBNo.PT6A-72-13402,PT6A-65AG,BS708,BS903,BS1101,andBS1!02withpre-SBPT6A-72-13408,I_,·.·::).:·-!:·'·;configuration;PT6A-67AF;andPT6A-67AGturbopropengineswithWoodwardfuelcontrolunits(FCUs)installed.(d)ReasonThisADwaspromptedbyincidentsofcorrosionandperforationofthetwo-plyCu-BebellowsinWoodwardFCUs.WeareissuingthisADtopreventfailureoftheWoodwardFCU,whichcouldleadtofailureoftheengine,in-flightshutdown,andlossofcontroloftheairplane.6(e) Actions

and Compliance Comply

with

this

AD within

the compliance

times specified,

unless already

done. (!) For PWC PT6A-67

AF

and PT6A-67

AG engines,

within

500 flight

hours (FHs)

or one

year

after

the effective

date

of this

AD, whichever

occurs

first, replace

the Woodward

FCU.

Use paragraphs

3.A.

and

3.C. ofPWC

Service Bulletin

(SB)

No. PT6A72-14389,

Revision

3, dated January

27, 2011

to replace

the FCU. (2) For PWC PT6A-60AG

BS919

and BS1048

engines

with pre-SB

No. PT6A72-13402 configuration,

within

36 months

after

the effective

date

of this

AD, replace

the Woodward

FCU.

Use paragraph

3.C.(l)

and 3.C.(3) ofPWC

SB No. PT6A-72-13473, Revision

1, dated

May 26,2015

to replace

the FCU. (3) For PWC PT6A-65AG

BS708,

BS903, BSllOl,

and BS1102

engines

with pre-SB PT6A-72-13408

configuration,

within

36 months

after

the effective

date

of this AD, replace

the Woodward

FCU.

Use paragraphs

3.A.(l)

and 3.A.(3) ofPWC

SB

No. PT6A-72-13473,

Revision

1, dated

May 26,2015

to replace

the FCU. (f) Credit

for Previous

Actions You

may

take credit

for

the actions required

by paragraph

(e)

of this

AD

if you performed

the actions

before

the effective

date

of this

AD

in accordance

with PWC

SB No. PT6A-72-14389,

Revision

2, dated April23,

2009;

or SB

No. PT6A-72-13473,

dated March

12, 2015;

or SB No. PT6A-72-13408,

Revision

1, dated March

12, 2015;

or earlier versions. (g) Alternative

Methods

of Compliance

(AMOCs) The Manager,

Engine Certification

Office,

FAA,

may approve

AMOCs

for

this AD.

Use

the procedures

found

in

14 CFR 39.19

to make

your request.

You

may email your request

to: ANE-AD-AMOC@faa.gov.

7(h)RelatedInformation(1)FormoreinformationaboutthisAD,contactBesianLuga,AerospaceEngineer,EngineCertificationOffice,FAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA01803;phone:781-238-7750;fax:781-238-7199;email:besian.luga@faa.gov.(2)RefertoMCAITransportCanadaADCF-2015-23,datedJuly23,2015,formoreinformation.YoumayexaminetheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingitinDocketNo.FAAw2015-3732.(3)PWCSBNo.PT6A-72-14389,Revision3,datedJanuary27,2011andSBNo.13473,Revision1,datedMay26,2015,canbeobtainedfromPWC,usingthecontactinformationinparagraph(h)(4)ofthisproposedAD.(4)ForserviceinformationidentifiedinthisproposedAD,contactPratt&WhitneyCorp.,1000Marie-Victorin,Longueuil,Quebec,Canada,J4G!AI;phone:800-268-8000;fax:450-647-2888;Website:www.pwc.ca.(5)YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,12NewEnglandExecutivePark,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.IssuedinBurlington,Massachusetts,onNovember4,2015.ColleenM.D'Alessandro,DirectorateManager,Engine&PropellerDirectorate,AircraftCertificationService.8