AD 91-06-02

91-06-02 PRATT & WHITNEY CANADA: Amendment 39-6888. Docket No. 90-ANE-31. Applicability: Pratt & Whitney Canada (PWC) PW115, PW118, PW118A, PW120, PW120A, PW121, PW123, PW124, PW124A, PW124B, PW125B and PW126A turboprop engines installed on, but not limited to, Aerospatiale ATR-42 and ATR-72, British Aerospace ATP, DeHavilland of Canada DHC-8, Embraer EMB-120, Fokker F-50, and Canadair CL-215T type aircraft. Compliance: Required within the next 1,200 hours time in service after the effective date of this AD, unless already accomplished. To prevent fuel leakage from the fuel filter cover assembly which could result in a fire hazard in the engine nacelle, accomplish the following: (a) For PWC PW115, PW118, PW118A, PW120, PW120A, PW121, PW124, PW124A, PW124B, PW125B and PW126A engines, incorporate a new fuel pump filter cover assembly in accordance with either PWC Service Bulletin (SB) No. 20897, Revision 1, dated October 15 1990, or PWC SB No. 20907, dated August 20, 1990, as applicable. (b) For PWC PW123 engines, incorporate a new fuel pump in accordance with PWC SB No. 20355, Revision 1, dated August 1, 1990. (c) For PWC PW123 engines, incorporate a new fuel pump filter cover assembly in accordance with PWC SB No. 20897, dated August 20, 1990. (d) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished. (e) Upon submission of substantiating data by an owner or operator through an FAA Airworthiness Inspector, an alternate method of compliance with the requirements of this AD, or adjustments to the compliance schedule specified in this AD, may be approved by the Manager, Engine Certification Office, Engine and Propeller Directorate, Aircraft Certification Service, FAA, 12 New England Executive Park, Burlington, Massachusetts 01803-5299. The initial and repetitive inspection program shall be done in accordance with the following PWC documents:

DOCUMENT PAGEREVISION DATE PWC SB 20897 ALL Revision 1 Oct. 15, 1990 PWC SB 20907 ALL Original Aug. 20, 1990 PWC SB 20355 ALL Rev. 1 Aug. 1, 1990

This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 522(a) and 1 CFR Part 51. Copies may be obtained from Pratt & Whitney Canada, Technical Publications Department, 1000 Marie Victorin, Longueuil, Quebec J4G 1A1. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Room 311, Burlington, Massachusetts 01803-5299, or at the Office of the Federal Register, 1100 L Street, NW, Room 8401, Washington, D.C. 20591. This amendment (39-6888, AD 91-06-02) becomes effective on March 29, 1991.