### [4910-13-P] DEPARTMENT OF TRANSPORTATION 

### Federal Aviation Administration 14 CFR Part39 

### [Docket No. FAA-2015-3732; Directorate Identifier 2015-NE-25-AD; Amendment 39-18431; AD 2016-05-13] RlN 2120-AA64 

### Airworthiness Directives; Pratt & 

### Whitney Canada Corp. Turboprop Engines 

### AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. 

### SUMMARY: We are adopting a new airworthiness directive (AD) for certainPratt & 

### Whitney CanadaCorp. (PWC) PT6A-60AG, -65AG, -67AF, and -67AG turboprop engines. This AD requires removing Woodward fuel control units (FCUs) and installing

an FCU that is eligible for installation. This AD was prompted by incidents ofcorrosion andperforation ofthe two-ply Cu-Be bellows in Woodward FCUs. We are issuing this AD to prevent failure ofthe Woodward FCU and engine, in-flight shutdown, and loss of control ofthe airplane. DATES: This AD becomes effective [INSERT DATE 35 DAYS AFTERDATE OF PUBLICATION IN THE FEDERAL REGISTER]. The Director ofthe Federal Register approved the incorporation by 

### reference of certain publications listed in this AD as of [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

### ADDRESSES: For service information identified inthis AD, contactPratt & 

### Whitney Canada Corp., 1000 Marie-Victorin, Longueuil, Quebec, Canada, J4G lAl; phone: 800- 268-8000; fax: 450-647-2888; Internet: www.pwc.ca. You may viewthis service information at the FAA, Engine & 

### Propeller Directorate, 1200 DistrictAvenue, Burlington, MA. Forinformation onthe availability ofthis material at the FAA, call 781- 238-7125. It

### is also available onthe Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2015-3732. 

### Examining the AD Docket You may examinethe AD docket onthe Internet at http://www.regulations.gov by searching for and locating DocketNo. FAA-2015-3732; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket containsthis 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 Document Management Facility, U.S. Department ofTransportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 NewJersey Avenue SE., Washington, DC 20590. FOR FURTHERINFORMATION CONTACT: Besian Luga, Aerospace Engineer, Engine Certification Office, FAA, Engine & 

### Propeller Directorate, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7750; fax: 781-238-7199; email: besian.luga@faa.gov.

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### SUPPLEMENTARY INFORMATION: Discussion We issued a notice ofproposedrulemaking (NPRM) to amend 14 CFRpart 39 by adding an AD thatwould apply to the specified products. The NPRJ\1 was published in the Federal Register onNovember 10, 2015 (80 FR 69623). TheNPRM proposedto

correct an unsafe conditionfor the specifiedproducts. The MCAI states:



### Comments There have been in-service incidents involving corrosion and perforation ofthetwo-ply Cu-Be bellows in Woodward Fuel Control Units (FCU) fitted to PT6A-60, -65 and -67 series engines. In certaininstances, associatedbellows leakage has resulted in loss ofengine power, in-flight shutdowns (IFSD) and even accidents. Engines installed on the aeroplanes that are used for crop dusting, dueto the operational environment, are more susceptible to corrosion damageto the subject bellows. Loss ofengine power or shut down inflight by itselfusually is not considered a catastrophic event. However, on an aeroplane with single engine installation, an enginepower loss or IFSD at a critical phase offlight could adversely affect the safe operation of the aeroplane.

We gave the public the opportunity to participate in developing this AD. We received no comments onthe NPRM (80 FR 69623, November 10, 2015). We updated the revision number and date ofPWC Service Bulletin (SB) No. PT6A-72-14389. 

### Conclusion We reviewedthe available data and determined that air safety andthe public interest require adopting this AD withthe changes described previously. We determined that these changes will not increase the economic burden on any operator or increase the scope ofthis AD.

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### Related Service Information under 1 CFR Part 51 PWC has issued SB No. PT6A-72-14389, Revision 4, dated February 3, 2016 and SB No. PT6A-72-13473, Revision 1, dated May 26,2015. The service information describes procedures for replacing Woodward FCUs. This service information is reasonably available becausethe interested parties have access to itthrough their normal

course ofbusiness orbythe means identified in the ADDRESSES section ofthis final 

### rule. Costs ofCompliance We estimate thatthis AD affects 341 engines installed on airplanes ofU.S. registry. We also estimate that itwill take about 1.5 hoursperengineto comply withthis AD. The average labor rate is $85 per hour. Required parts cost about $1,000 perengine. Based onthese figures, we estimate the cost ofthis AD on U.S. operators to be $384,478. 

### Authority for This Rulemaking Title 49 ofthe United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority ofthe FAA Administrator. "Subtitle VII: AviationPrograms," describes inmore detail the scope ofthe Agency's authority. We are issuing this rulemaking under the authority described in "Subtitle VII, Part A, Subpart III, Section44701: General requirements." Under that section, Congress charges the FAA withpromoting safe flight ofcivil aircraft in air commerce by prescribing regulations for practices, methods, andprocedures the Administrator finds necessary for safety in air commerce. This regulation is withinthe scope ofthat authority because it addresses an unsafe conditionthat is likely to exist or develop on products identified inthis rulemaking action.

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### Regulatory Findings We determined that this AD will nothave federalism implications under Executive Order 13132. This AD will nothave a substantial direct effect onthe States, on the relationship betweenthe national government and the States, or on the distribution of power and responsibilities among the various levels ofgovernment. Forthe reasons discussed above, I certify this AD: (1) Is not a "significantregulatory 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 inAlaska to the extentthat itjustifies making a regulatory distinction, and (4) Will not have a significant economic impact, positive or negative, on a substantial number ofsmall entities under the criteria ofthe Regulatory Flexibility Act. List ofSubjects in 

### 14 CFR Part 39 Airtransportation, Aircraft, Aviation safety, Incorporationby reference, Safety. Adoption ofthe Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFRpart 39 as follows: 

### PART 39 

### -AIRWORTHINESS DIRECTIVES 1. The authority citationfor part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. §39.13 [Amended] 2. The FAA amends§ 39.13 by adding the following new airworthiness directive (AD): 

### 2016-05-13 Pratt & 

### Whitney Canada Corp. (Type Certificate previously held by Pratt & 

### Whitney Canada, Inc., Pratt & 

### Whitney Aircraft ofCanada, Ltd., and 

### 5United Aircraft ofCanada, Ltd.): Amendment 39-18431; DocketNo. FAA-2015-3732; Directorate Identifier 2015-NE-25-AD. (a) Effective Date This AD becomes effective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. (b) Affected ADs None. (c) Applicability This AD applies to Pratt & Whitney Canada Corp. (PWC) PT6A-60AG, BS919 and BS1048 withpre-SB No. PT6A-72-13402, dated August 12, 2005 configmation; PT6A-65AG, BS708, BS903, BS1101, and BS1102 with pre-SB PT6A·72-13408, dated July 3, 2006 configuration; PT6A-67AF; and PT6A-67AG turboprop engines with Woodward fuel control units (FCUs), installed. (d) Reason This AD wasprompted by incidents ofcorrosion andperforation ofthe two-ply Cu-Be bellows in Woodward FCUs. We are issuing this AD to preventfailure ofthe Woodward FCU and engine, in-flight shutdown, and loss ofcontrol ofthe airplane. (e) 

### Actions and Compliance Comply with this AD withinthe compliance times specified, unless already done. (1) For PWC PT6A-67 AF andPT6A-67AG engines, within 500 flight hours (FHs) or one year after the effective date ofthis AD, whichever occurs first, replace the Woodward FCU. Use paragraphs 3.A. and 3.C. ofPWC Service Bulletin (SB) No. PT6A· 72-14389, Revision4, dated February 3, 2016 to replace the FCU. (2) For PWC PT6A-60AG BS919 and BS1048 engines with pre-SB No. PT6A72-13402 configurations, within 36 months after the effective date ofthis AD, replace the

6Woodward FCU. Use paragraph 3.C.(l) and 3.C.(3) ofPWC SB No. PT6A-72-13473, Revision I, dated May 26,2015 to replace the FCU. (3) For PWC PT6A-65AG BS708, BS903, BSliOI, and BSI102 engines with pre-SB PT6A-72-13408 configurations, within 36 months after the effective date ofthis AD, replace the Woodward FCU. Use paragraphs 3.A.(l) and 3.A.(3) ofpWC SB No. PT6A-72-13473, Revision 1, datedMay 26, 2015 to replace the FCU. 

### (f) Creditfor Previous Actions Youmay take credit for the actions required byparagraph (e) ofthis AD ifyou performed the actions before the effective date ofthis AD in accordance with PWC SB No. PT6A-72-14389, Revision 3, datedJanuary 27, 2011; or SB No. PT6A-72-13473, dated March 12, 2015; or SB No. PT6A-72-13408, Revision I, dated March 12, 2015; or earlier versions. (g) Alternative Methods ofCompliance (AMOCs) The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make yourrequest. Youmay email your request to: ANE-AD-AMOC@faa.gov. (h) Related Information (1) For more information aboutthis AD, contact Besian Luga, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 DistrictAvenue, Burlington, MA 01803; phone: 781-238-7750; fax: 781-238-7199; email: besian.luga@faa.gov. (2) Refer to MCAI Transport CanadaAD CF-2015-23, dated July 23,2015, for

more information. You may examine the MCAI inthe AD docket onthe Internet at http://VoiWW.regulations.gov by searching for and locating it in DocketNo. FAA-2015-3732. You may examine the MCAI in the AD docket on the Internet at**http://www.regulations.gov/#!documentDetai1;D~F**AA-2015-3732-0002. 

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### (i) Material Incorporated by 

### Reference (1) The Director ofthe Federal Register approved the incorporationbyreference (IBR) ofthe service information listed in this paragraph tmder 5 U.S.C. 552(a) and 1 CPR 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) Pratt & 

### Whitney Canada (PWC) Service Bulletin (SB) No. PT6A-72-14389, Revision 4, dated February 3, 2016. (ii) PWC SB No. PT6A-72-13473, Revision 1, dated May 26,2015 (3) ForPWC service information identified inthis AD, contact Pratt & 

### Whitney Corp., 1000 Marie-Victorin, Longueuil, Quebec, Canada, J4G 1Al; phone: 800-268- 8000; fax: 450-647-2888; Internet: www.pwc.ca. (4) You may viewthis service information at FAA,Engine & 

### Propeller Directorate, 1200 District Avenue, Burlington, MA. For information on the availability of this material at the FAA, call781-238-7125. (5) You may viewthis service information at the National Archives and Records Administration (NARA). For infonnation on the availability ofthis material at NARA, call 202-741-6030, or go to: http;//www.archives.gov/federal-register/cfr/ibrlocations.html.

Issued in Burlington, Massachusetts, on March 2, 2016.

# CdiJJ~M.- YYl [)

# a.luJC//vl

# dt<J2. Colleen M. D'Alessandro, Manager, Engine & 

### Propeller Directorate, Aircraft Certification Service.

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