AD 91-15-02 ACTIVE

91-15-02 PRATT & WHITNEY CANADA, INC.: Amendment 39-7065. Docket No. 91-ANE-20.
Applicability: Pratt & Whitney Canada (PWC) JT15D-4B turbofan engines, with the following serial numbers, installed on, but not limited to, Cessna model S550 (Citation S/II) series airplanes:

Serial Numbers
PC-E 102047 to PC-E 102050 inclusive,

PC-E 102053 to PC-E 102066 inclusive,

PC-E 102069, PC-E 102070, PC-E 102073,

PC-E 102082, and PC-E 102089.

Compliance: Required as indicated, unless previously accomplished.
To prevent rupture of the gas generator case (GGC) which could result in an inflight shutdown, aborted takeoff, and/or damage to the aircraft, accomplish the following:
(a) Perform a borescope inspection of GGC Part Number (P/N) 3106469-01 in accordance with PWC JT15D-4B Maintenance Manual (MM), P/N 3017542, Temporary Revision (TR) 72-95, dated January 16, 1991, and TR 72-96, dated January 16, 1991, paying particular attention to the spot welds, within 10days after the effective date of this AD, unless already accomplished within the previous 150 engine operating hours or 150 cycles in service, whichever is the shorter interval.
(b) Thereafter, perform repetitive borescope inspections of GGC P/N 3106469-01 in accordance with PWC JT15D-4B MM TR 72-95, dated January 16, 1991, and TR 72-96, dated January 16, 1991, paying particular attention to the spot welds, at intervals not to exceed 150 engine operating hours or 150 cycles in service, since last inspection, whichever occurs first.
(c) Borescope inspections performed in accordance with PWC Service Information Letter Number 7040, dated December 17, 1990, are considered to satisfy the requirements of paragraph (a) of this AD.
(d) Remove from service prior to further flight, GGC's which are found to be cracked, and replace with a serviceable part, as defined in paragraph (e) of this AD.
(e) Remove GGC P/N 3106469-01 and replace with a serviceable GGC P/N 3109069-01, 3110464-01or 3114407-01 during the next engine overhaul.
(f) For the purpose of this AD an engine overhaul is defined as any engine maintenance action which includes separation of the GGC forward outer flange and aft flange.
(g) 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.
(h) Upon submission of substantiating data by an owner or operator through an FAA Inspector, (maintenance, avionics, or operations) an alternate method of compliance with the requirements of this AD or adjustments to the compliance times specified in this AD may be approved by the Manager, Engine Certification Office, ANE-140, Engine and Propeller Directorate, Aircraft Certification Service, FAA, 12 New England Executive Park, Burlington, Massachusetts 01803-5299.
The inspections shall be done in accordance with the following Pratt & Whitney Canada documents:

Document Number
Page Number
Issue/Rev
Date
Temporary Revision 72-95 to PWC Maintenance Manual Part No. 3017542
1
Original
1/16/91
Temporary Revision 72-96 to PWC Maintenance Manual Part No. 3017542
1
Original
1/16/91
Total Pages: 2

This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Pratt & Whitney Canada, Inc., Publications Distribution Department, 03CA1, 1000 Marie Victorin, Longueuil, Quebec, Canada 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, or at the Office of the Federal Register, 1100 L Street, NW, Room 8401, Washington, DC.
This amendment (39-7065, AD 91-15-02) becomes effective on August 22, 1991.