(Docket No. FAA-2013-1059; Directorate Identifier 2013-NE-36-AD;] 

RIN 2120-AA64 

Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking (NPRM). 

SUMMARY: We propose to supersede Airworthiness Directive (AD) 2014-14-02, 

which applies to certain Pratt & Whitney Canada Corp. (P&WC) PW120, PW121, 

PW121A, PW124B, PW127, PW127E, PW127F, PW127G, and PW127M turboprop 

engines. AD 2014-14-02 requires removal of the 0-ring seal from the fuel manifold 

fitting. Since we issued AD 2014-14-02, we received reports offue1 seepage past the 

metal-to-metal sealing surfaces of the fuel nozzle and fuel manifold flow adapter. This 

proposed AD would require replacement of the fuel nozzle and the fuel manifold flow 

adapter. We are proposing this AD to prevent in-flight fuel leakage, engine fire, damage 

to the engine, and damage to the airplane. 

DATES: We must receive comments on this proposed AD by [INSERT DATE 60 

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 

and 11.45, by any of the following methods: 

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202-493-2251. 
Monday through Friday, except Federal holidays. 

For service information identified in this proposed AD, contact Pratt & Whitney 

Canada Corp., 1000 Marie-Victorin, Longueuil, Quebec, Canada, J4G 1A1; 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, 

call 781-238-7125. 

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-2013-1059; 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 proposed AD, the regulatory evaluation, any 

comments received, and other information. The street 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: Barbara Caufield, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 01803; phone: 781-238-7146; fax: 781-238-

7199; email: barbara.caufield@faa.gov. 

2 
Include 

Docket No. F AA

20 13

1 059; Directorate Identifier 20 13

NE

36

AD

 at the 

beginning of your comments. We specifically invite comments on the overall regulatory, 

economic, environmental, and energy aspects of this proposed AD. We will consider all 

comments received by the closing date and may amend this proposed AD because of 

those comments. 

We will post all comments we receive, without change, to 

http://www.regulations.gov, including any personal information you provide. We will 

also post a report summarizing each substantive verbal contact we receive about this 

proposed AD. 

Discussion 

On June 30,2014, we issued AD 2014-14-02, Amendment 39-17896 (79 FR 

39958, July 11, 2014), ("AD 2014-14-02"), for certain P&WC PW120, PW121, 

PW1 21A, PW124B, PW127, PW127E, PW127F, PW127G, and PW127M turboprop 

engines. AD 2014-14-02 requires removal ofthe 0-ring seal from the fuel manifold 

fitting. AD 2014-14-02 resulted from reports of fuel leaks at the interface between the 

fuel manifold and the fuel nozzle that resulted in engine fire. We issued AD 2014-14-02 

to prevent in-flight fuel leakage, engine fire, damage to the engine, and damage to the 

airplane. 

Actions Since AD 2014-14-02 Was Issued 

Since we issued AD 2014-14-02, we have received reports of fuel seepage past 

the metal to metal sealing surfaces of the fuel nozzle and fuel manifold flow adapter. The 

manufacturer has since redesigned the fuel manifold flow adapter to prevent in-flight fuel 

3 
identifies the final fuel nozzle configuration. This SB refers to the following additional 

SBs that provide the final configuration: P&WC SB No. PW100-72-21803, Revision No. 

5, dated November 21,2014, P&WC SB No. PW100-72-21860, Revision No.2, dated 

November 21,2014, and P&WC SB No. PWl00-72-21841, Revision No.3, dated 

December 22, 2014. Tills service information is reasonably available; see ADDRESSES 

for ways to access this service information. 

FAA's Determination 

We are proposing this AD because we evaluated all the relevant information and 

determined the unsafe condition described previously is likely to exist or develop in other 

products of the same type design. 

Proposed AD Requirements 

This proposed AD would require replacement of the fuel nozzle and the fuel 

manifold flow adapter. 

Costs of Compliance 

We estimate that tills proposed AD would affect about 150 engines installed on 

airplanes of U.S. registry. We also estimate that it would take about 2.5 hours per engine 

to perform the replacement required by this proposed AD. The average labor rate is $85 

per hour. The cost of a fuel nozzle manifold replacement is $146,594. Based on these 

figures, we estimate the cost of the proposed AD on U.S. operators to be $22,020,975. 

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. 

4 
charges the FAA with promoting safe fl ight 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. 

Regulatory Findings 

We have determined that this proposed AD would not have federalism 

implications under Executive Order 13132. This proposed AD would 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 that the proposed regulation: 

(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. 

5 
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 removing Airworthiness Directive (AD) 2014-14-

02, Amendment 39-17896 (79 FR 39958, July 11, 2014), and adding the following new 

AD: 

Pratt & Whitney Canada Corp.: Docket No. F AA-2013-1 059; Directorate 

Identifier 2013-NE-36-AD. 

{a) Comments Due Date 

The FAA must receive comments on this AD action by [INSERT DATE 60 

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

(b) Affected ADs 

This AD replaces AD 2014-14-02, Amendment 39-17896 (79 FR 39958, July 11 , 

2014). 

(c) Applicability 

This AD applies to Pratt & Whitney Canada Corp. (P&WC) PW120, PW121, and 

PW121A turboprop engines with post SB 21610 configuration; PW124B, PW127, 

PW127E, and PW127F turboprop engines with post SB 21607 configuration; PW127E 

and PW127F turboprop engines with serial numbers (SINs) PCE-EB0366 and earlier; 

PW127G turboprop engines with SINs PCE-AX0275 and earlier; and PW127M 

turboprop engines with SINs PCE-ED0810 and earlier. 

6 
p

(e) Compliance 

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

Within 1,500 flight hours after the effective date of this AD, or at the next engine shop 

visit, whichever occurs first: 

(1) Remove the 0-ring seal from the fuel manifold fitting, 

(2) Remove fuel manifold flow adapter, part number (PINs) 3059754-01, 

3059757-01, and 3059760-01; and 

(3) Install a fuel nozzle gasket and fuel manifold flow adapter that are eligible for 

installation in accordance with paragraphs 3.A, 3.B, and 3.C ofP&WC SB No. PW100-

72-21861, dated November 21,2014. 

(f) Installation Prohibition 

After the effective date of this AD, fuel manifold adapter, PINs 3059754-01, 

3059757-01, and 3059760-01, and fuel manifold gasket, PIN 3079354-01, are not eligible 

for installation in any engine. 

(g) Definition 

For the purpose of this AD, an engine shop visit is the induction of an engine into 

the shop for maintenance involving the separation of pairs of major mating engine 

flanges. The separation of engine flanges solely for the purpose of transportation without 

subsequent engine maintenance does not constitute an engine shop visit. 

7 
(i) Related Information 

(1) For more information about this AD, contact Barbara Caufield, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 01803; phone: 781-238-7146; fax: 

781-238-7199; email: barbara.caufield@faa.gov. 

(2) Refer to MCAI Transport Canada AD CF-2014-41, dated November 26, 2014, 

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

http://www.regulations.gov by searching for and locating it in Docket No. F AA-2013-

1059. 

(3) P&WC SB No. PW100-72-21861, dated November 21, 2014; P&WC SB No. 

PWI00-72-21803, Revision No.5, dated November 21, 2014; P&WC SB No. PW100-

72-21860, Revision No.2, dated November 21 , 2014; and P&WC SB No. PW100-72-

21841, Revision No.3 dated December 22, 2014, can be obtained from Pratt & Whitney 

Canada, using the contact information in paragraph (i)(4) of this AD. 

( 4) For service information identified in this AD, contact Pratt & Whitney Canada 

Corp., 1000 Marie-Victorin Blvd., Longueuil, Quebec, Canada, J4G 1A1 ; phone: 800-

268-8000; fax: 450-647-2888; Web site: www.pwc.ca. 

(5) You may view this service information at the FAA, Engine & Propeller 

Directorate, 12 New England Executive Park, Burlington, MA. For information on the 

availability ofthis material at the FAA, call 781-238-7125. 

8 
Acting Directorate Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

9