# [4910-13-P[ DEPARTMENT

OF TRANSPORTATION Federal Aviation Administration 

# 14 CFR Part

39 [Docket

No. FAA-2015-3661;

Directorate
Identifier 2015-NE-24-AD;

Amendment 

# 39-18422;

AD 2016-05-04[ RIN 2120-AA64 Airworthiness

Directives;

Dowty Propellers Constant

Speed Propellers AGENCY:



# Federal Aviation Administration

(FAA),

DOT. ACTION:

Final
rule. SUMMARY:



# We

are adopting

a new airworthiness

directive

(AD)

for certain Dowty Propellers R352/6-123-F/l, R352/6-123-F/2,

and R410/6-123-F/35

model propellers. This

AD was prompted

by 

# reports

of dowel

hole cracks

in the face

of the rear
hub half. This

AD requires installing

dowel

hole liners

as necessary.

We

are issuing

this AD

to prevent

loss

of structural integrity

of the propeller

hub, which could result

in damage

to the propeller

and damage

to the airplane. DATES:

This

AD becomes effective [INSERT

DATE

35 DAYS AFTER

DATE

OF PUBLICATION

IN THE FEDERAL REGISTER]. The Director

of the Federal Register approved

the incorporation

by reference

of

a certain publication

listed

in this AD

as of [INSERT

DATE

35 DAYS AFTER

DATE

OF PUBLICATION

IN THE FEDERAL REGISTER]. ADDRESSES:



# For service information
identified

in this final rule, contact Do\Vty Propellers,

114 Powers

Court, Sterling,

VA 20166; phone: 703-421-4434;

fax: 703-450-0087;email:technicalsupport@dowty.com;Internet:http://dowty.com/services/repairand-overhaul.YoumayviewthisserviceinformationattheFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.ItisalsoavailableontheInternetathttp://www.regulations.govby searchingforandlocatingDocketNo.FAA2015-3661.ExaminingtheADDocketYoumayexaminetheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-3661;orinpersonattheDocketManagementFacilitybetween9a.m.and5p.m.,MondaythroughFriday,exceptFederalholidays.TheADdocketcontainsthisAD,themandatorycontinuingairworthinessinformation(MCAI),theregulatoryevaluation,anycommentsreceived,andotherinformation.TheaddressfortheDocket Office(phone:800-647-5527)isDocumentManagementFacility,U.S.DepartmentofTransportation,DocketOperations,M-30,WestBuildingGroundFloor,RoomW12-140,1200NewJerseyAvenueSE.,Washington,DC20590.FORFURTHERINFORMATIONCONTACT:MichaelSchwetz,AerospaceEngineer,BostonAircraftCertificationOffice,FAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA01803;phone:781-238-7761;fax:781-238-7898;email:michael.schwetz@faa.gov.2SUPPLEMENTARYINFORMATION:DiscussionWeissuedanoticeofproposedrulernaking(NPRM)toamend14CFRpart39byaddinganADthatwouldapplytothespecifiedproducts.TheNPRMwaspublishedintheFederalRegisteronOctober13,2015(80FR61330).TheNPRMproposedtocorrectanunsafeconditionforthespecifiedproducts.TheMCAIstates:Crackingaroundthehublocationdowelholesinthefaceoftherearhubhalfhasoccurredsporadically.Previousinvestigationsfoundnomanufacturingdefectsincrackedhubsandconcludedthatthehubcrackingwascausedbydamagetothedowelholesduringpropellerinstallation.SincethatoriginalSBwasissued,threehubshavebeenfoundtoshowcrackingaroundthelocationdowelholes.Thehubswereallfoundcrackedwithinashortperiodoftimeandallhadlowtimesincenew.Thiscondition,ifnotdetected,canadverselyaffectthestructuralintegrityofthepropellerhub,withpossibledamagetothepropellerandtotheaeroplane.YoumayobtainfurtherinformationbyexaminingtheMCAIintheADdocketontheInternetathttp://www.regulations.govbysearchingforandlocatingDocketNo.FAA-2015-3661.CommentsWegavethepublictheopportunitytoparticipateindevelopingthisAD.WereceivednocommentsontheNPRM(80FR61330,October13,2015).However,wechangedparagraph(e)ActionsandCompliancetorevisethecompliancetimestoread,"(1)Atthenextremovalofthepropellerfromtheairplane,aftertheeffectivedateofthisAD,installlinersintothehublocationdowelholesandidentifythehubPIN.3(2) Use Dowty Propellers

Alert Service Bulletin

(ASB)

No. F50-61-A165, Revision

2, dated

July 28,2015

to install

the liners

and identify

the hub." We removed Component Maintenance

Manual (CMM) 61-10-34,

Repair

No.

53, dated
May

15, 2013,

from

the Other Related Service Information
paragraph

of this AD. We removed Component Maintenance

Manual (CMM) 61-10-34,

Repair

No.

53, dated
May

15, 2013, which relates

to repair scheme 650510057,

from

the Credit

for Previous Actions paragraph

(1)(2)

of this AD. We removed

CMM 61-10-34,

Repair

No.

53, dated
May 15,2013,

from

the Related Information
paragraph

(h)

of this AD. Conclusion

We reviewed

the available

data

and determined

that

air safety

and
the public interest require adopting

this
AD with

the changes described previously.

We determined that these changes

will

not increase

the economic

burden

on any operator

or increase

the scope

of this AD. Related Service Information

under

1 CFR Part

51 Dowty Propellers

has issued (ASB)

No. F50-61-Al65,

Revision

2, dated

July

28, 2015.

The service information

describes procedures

for installing

liners

in the hub location

dowel
holes

in the face

of the rear hub half

and identifying

the hub with

the repair number.

This service information

is reasonably

available because the interested parties

have access

to

it through

their nonnal course

of business

or by the means identified

in the ADDRESSES

section

of this final rule. 4CostsofComplianceWeestimatethatthisADaffects4propellersinstalledonairplanesofU.S.registry.Wealsoestimatethatitwilltakeabout5hoursperpropellertocomplywiththisAD.Theaveragelaborrateis$85perhour.Requiredpartscostabout$322perpropeller.Basedonthesefigures,weestimatethecostofthisADonU.S.operatorstobe$2,988.AuthorityforThisRulemakingTitle49oftheUnitedStatesCodespecifiestheFAA'sauthoritytoissuerulesonaviationsafety.SubtitleI,section106,describestheauthorityoftheFAAAdministrator."SubtitleVII:AviationPrograms,"describesinmoredetailthescopeoftheAgency'sauthority.Weareissuingthisrulemakingundertheauthoritydescribedin"SubtitleVII,PartA,SubpartIII,Section44701:Generalrequirements."Underthatsection,CongresschargestheFAAwithpromotingsafeflightofcivilaircraftinaircommercebyprescribingregulationsforpractices,methods,andprocedurestheAdministratorfindsnecessaryforsafetyinaircommerce.Thisregulationiswithinthescopeofthatauthoritybecauseitaddressesanunsafeconditionthatislikelytoexistordeveloponproductsidentifiedinthisrulemakingaction.RegulatoryFindingsWedeterminedthatthisADwillnothavefederalismimplicationsunderExecutiveOrder13132.ThisADwillnothaveasubstantialdirecteffectontheStates,ontherelationshipbetweenthenationalgovernmentandtheStates,oronthedistributionofpowerandresponsibilitiesamongthevariouslevelsofgovernment.Forthereasonsdiscussedabove,IcertifythisAD:5(1)Isnota"significantregulatoryaction"underExecutiveOrder12866,(2)Isnota"significantrule"undertheDOTRegulatoryPoliciesandProcedures(44FR11034,February26,1979),(3)WillnotaffectintrastateaviationinAlaskatotheextentthatitjustifiesmakingaregulatorydistinction,and(4)Willnothaveasignificanteconomicimpact,positiveornegative,onasubstantialnumberofsmallentitiesunderthecriteriaoftheRegulatoryFlexibilityAct.ListofSubjectsin14CFRPart39Airtransportation,Aircraft,Aviationsafety,Incorporationbyreference,Safety.AdoptionoftheAmendmentAccordingly,undertheauthoritydelegatedtomebytheAdministrator,theFAAamends14CPRpart39asfollows:PART39-AIRWORTHINESSDIRECTIVES1.Theauthoritycitationforpart39continuestoreadasfollows:Authority:49U.S.C.106(g),40113,44701.§39.13[Amended]2.TheFAAamends§39.13byaddingthefollowingnewairworthinessdirective(AD):2016-05-04DowtyPropellers:Amendment39-18422;DocketNo.FAA-2015-3661;DirectorateIdentifier2015-NE-24-AD.(a)EffectiveDateThisADbecomeseffective[INSERTDATE35DAYSAFTERDATEOFPUBLICATIONINTHEFEDERALREGISTER].6

# (b) Affected

ADs 

# None. 

# (c) Applicability This

AD applies

to Dowty Propellers R352/6-123-F/l, R352/6-!23-F/2,

and R410/6-123-F/35

model propellers,

part numbers

(PINs) 660715001,660715004,

and 660715005

with

hub PINs 660715201, 660715255, 660720217, 660720241, 660720252, 660720260,

and 660720288,

installed. (d) 

# Reason This

AD was prompted

by reports

of dowel

hole cracks

in the face

of the rear
hub half.

We

are issuing

this AD

to prevent

loss

of structural integrity

of the propeller

hub, which could result

in damage

to the propeller

and damage

to the airplane. (e) 

# Actions

and Compliance Comply

with

this AD within

the compliance

times specified,

unless already

done. (1)

At the next removal

of the propeller

from

the airplane,

after

the effective

date of this AD, **installlin~rs**



# into

the hub location

dowel
holes

and identify

the hub 

# PIN. (2) Use Dowty Propellers

Alert Service Bulletin

(ASB)

No. F50-61-Al65, Revision

2, dated

July

28, 2015

to install

the liners

and identify

the hub. (f) 

# Credit

for Previous
Actions You may take credit

for the actions required

by paragraph

(e)

of this AD

if you performed

those actions before

the effective

date

of this AD using Dowty Propellers

ASB No. F50-61-A165,

Revision

1, dated
May

12, 2015;

or initial issue, dated November

19, 2012.



# 7

# (g) Alternative

Methods

of Compliance
(AMOCs) The Manager,

Boston Aircraft Certification

Office,

FAA,

may approve AMOCs for this AD.
Use

the procedures

found

in

14 CFR 39.19

to make
your request. 

# (h) Related Information 

# (I) For more information

about

this AD, contact Michael Schwetz, Aerospace Engineer,

Boston Aircraft Certification

Office,

FAA,

1200 District Avenue, Burlington, MA 01803; phone: 781-238-7761;

fax: 781-238-7898;

email: michael.schwetz@faa.gov. (2) Refer

to MCAI European Aviation

Safety Agency

AD 2015-0158,

dated

July 30, 2015,

for more information.

You may examine

the MCAI

in the AD docket

on the Internet

at http://wwv.i.regulations.gov

by searching

for and locating



# it in Docket

No. FAA-2015-3661. 

# (i) Material Incorporated

by Reference 

# (1) The Director

of the Federal Register approved

the incorporation

by 

# reference (IBR)

of the service 

# information

listed

in this paragraph

under

5 U.S.C. 552(a)

and

1 CFR part

51. 

# (2) You must

use this service information

as applicable

to

do the actions required by this AD, unless

the AD specifies otherwise. (i) Dowty Propellers

Alert Service Bulletin

No. F50-61-Al65,

Revision

2, dated July

28, 2015. 

# (ii) Reserved. (3) For Dowty Propellers

service information
identified

in this AD, contact Dowty Propellers,

114 Powers

Court, Sterling,

VA 20166; phone: 703-421-4434;

fax: 703-450- 

# 80087;email:technicalsupport@dowty.com;Internet:http://dowty.com/services/repair-(4)YoumayviewthisserviceinformationatFAA,Engine&PropellerDirectorate,1200DistrictAvenue,Burlington,MA.ForinformationontheavailabilityofthismaterialattheFAA,call781-238-7125.(5)YoumayviewthisserviceinformationattheNationalArchivesandRecordsAdministration(NARA).ForinformationontheavailabilityofthismaterialatNARA,call202-741-6030,orgoto:http://wwvv.archives.gov/federal-register/cfr/ibrlocations.html.n,Massachusetts,onFebruary24,2016.RobertJ.Ganley,ActingManager,Engine&PropellerDirectorate,AircraftCertificationService.9