[4910-13-P] 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[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 certain Pratt & 

Whitney Canada Corp. (PWC) PT6A-60AG, -65AG, -67AF, and -67 AG 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 of corrosion 

and perforation of the two-ply Cu-Be bellows in Woodward FCUs. We are issuing this 

AD to prevent failure of the Woodward FCU and engine, in-flight shutdown, and loss of 

control of 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 

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 in this AD, contact Pratt & 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 view this service 

information at the FAA, Engine & Propeller Directorate, 1200 District A venue, 

Burlington, MA. For information on the availability of this material at the FAA, call 781-

238-7125. It is also available on the Internet at http://www.regulations.gov by searching 

for and locating Docket No. FAA -2015-3 732. 

Examining the AD Docket 

You may examine the AD docket on the Internet at http://www.regulations.gov by 

searching for and locating Docket No. 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 contains this 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 of Transportation, Docket Operations, M-30, 

West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., 

Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: Besian Luga, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 District A venue, 

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 of proposed rulemaking (NPRM) to amend 14 CFR part 39 by 

adding an AD that would apply to the specified products. The NPRJ\1 was published in 

the Federal Register on November 10, 2015 (80 FR 69623). The NPRM proposed to 

correct an unsafe condition for the specified products. The MCAI states: 

Comments 

There have been in-service incidents involving corrosion and 

perforation of the two-ply Cu-Be bellows in Woodward Fuel 

Control Units (FCU) fitted to PT6A-60, -65 and -67 series engines. 

In certain instances, associated bellows leakage has resulted in loss 

of engine power, in-flight shutdowns (IFSD) and even accidents. 

Engines installed on the aeroplanes that are used for crop dusting, 

due to the operational environment, are more susceptible to 

corrosion damage to the subject bellows. 

Loss of engine power or shut down in flight by itself usually is not 

considered a catastrophic event. However, on an aeroplane with 

single engine installation, an engine power loss or IFSD at a 

critical phase of flight 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 on the NPRM (80 FR 69623, November 10, 2015). 

We updated the revision number and date ofPWC Service Bulletin (SB) No. 

PT6A-72-14389. 

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. 

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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 because the interested parties have access to it through their normal 

course of business or by the means identified in the ADDRESSES section ofthis final 

rule. 

Costs of Compliance 

We estimate that this AD affects 341 engines installed on airplanes of U.S. 

registry. We also estimate that it will take about 1.5 hours per engine to comply with this 

AD. The average labor rate is $85 per hour. Required parts cost about $1,000 per engine. 

Based on these figures, we estimate the cost of this AD on U.S. operators to be $384,478. 

Authority for This Rulemaking 

Title 49 of the United States Code specifies the FAA's authority to issue rules on 

aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. 

"Subtitle VII: Aviation Programs," describes in more detail the scope of the Agency's 

authority. 

We are issuing this rulemaking under the authority described in "Subtitle VII, 

Part A, Subpart III, Section 44701: General requirements." Under that section, Congress 

charges the FAA with promoting safe flight of civil aircraft in air commerce by 

prescribing regulations for practices, methods, and procedures the Administrator finds 

necessary for safety in air commerce. This regulation is within the scope of that authority 

because it addresses an unsafe condition that is likely to exist or develop on products 

identified in this rulemaking action. 

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Regulatory Findings 

We determined that this AD will not have federalism implications under 

Executive Order 13132. This AD will not have a substantial direct effect on the States, on 

the relationship between the national government and the States, or on the distribution of 

power and responsibilities among the various levels of government. 

For the reasons discussed above, I certify this AD: 

(1) Is not a "significant regulatory 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 in Alaska to the extent that it justifies 

making a regulatory distinction, and 

(4) Will not have a significant economic impact, positive or negative, on a 

substantial number of small entities under the criteria of the Regulatory Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. 

Adoption of the Amendment 

Accordingly, under the authority delegated to me by the Administrator, the FAA 

amends 14 CFR part 39 as follows: 

PART 39 -AIRWORTHINESS DIRECTIVES 

1. The authority citation for 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 of Canada, Ltd., and 

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United Aircraft of Canada, Ltd.): Amendment 39-18431; Docket No. F AA-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 with pre-SB No. PT6A-72-13402, dated August 12, 2005 configmation; 

PT6A-65AG, BS708, BS903, BS 1101, and BS 1102 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 was prompted by incidents of corrosion and perforation of the two-ply 

Cu-Be bellows in Woodward FCUs. We are issuing this AD to prevent failure of the 

Woodward FCU and engine, in-flight shutdown, and loss of control of the airplane. 

(e) Actions and Compliance 

Comply with this AD within the compliance times specified, unless already done. 

(1) 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. PT6A· 

72-14389, Revision 4, 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 of this AD, replace the 

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Woodward 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 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 3, dated January 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 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. 

(h) Related Information 

(1) For more information about this AD, 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. 

(2) Refer to MCAI Transport Canada AD CF-2015-23, dated July 23,2015, for 

more information. You may examine the MCAI in the AD docket on the Internet at 

http://VoiWW.regulations.gov by searching for and locating it in Docket No. 

FAA-2015-3732. You may examine the MCAI in the AD docket on the Internet at 

http://www.regulations.gov/#!documentDetai1;D~F AA-20 15-3 732-0002. 

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(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 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) For PWC service information identified in this 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 view this service information at FAA, Engine & Propeller 

Directorate, 1200 District A venue, Burlington, MA. For information on the availability of 

this material at the FAA, call781-238-7125. 

(5) You may view this service information at the National Archives and Records 

Administration (NARA). For infonnation on the availability of this 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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