91-14-05 AVCO LYCOMING: Amendment 39-6955. Docket No. 91-ANE-09.
Applicability: Avco Lycoming ALF 502L series turbofan engines installed on, but not limited to the Canadair Challenger CL601 aircraft.
Compliance: Required as indicated, unless previously accomplished.
To prevent complete loss of engine power, uncontained disk failure, and possible damage to the aircraft, accomplish the following:
(a) Clean, visually inspect, coat with "Sermetel W" or "ALSEAL-518" and reidentify third stage high compressor (HC) rotor disks in accordance with Textron Lycoming Service Bulletin (SB) ALF 502L 72-203, Revision 3, dated December 7, 1990, as follows:
(1) For those third stage HC disks with 7,000 cycles since new (CSN) or greater on the effective date of this AD, within the next 500 cycles in service, not to exceed 8,500 CSN.
(2) For those third stage HC disks with less than 7,000 CSN on the effective date of this AD, at or prior to accumulating a total of 7,500 CSN.
(b) Remove, prior to further flight, third stage HC disks found with evidence of corrosion pitting or cracks.
(c) 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.
(d) 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 times specified in this AD may be approved by the Manager, Engine Certification Office, Engine and Propeller Directorate, Aircraft Certification Service, FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803-5299.
The inspection procedures shall be done in accordance with the following Textron Lycoming service bulletin:
Document No.
Page No.
Issue/Revision
Date
ALF 502L 72-203
1, 2, 4
3
December 7, 1990
ALF 502L 72-203
3, 6
2
August 8, 1990
ALF 502L 72-203
5
1
June 16, 1989This 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 Textron Lycoming, 550 Main Street, Stratford, Connecticut 06497. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, Massachusetts, or at the Office of the Federal Register, 1100 L Street NW, Room 8401, Washington, D.C.
This amendment (39-6955, AD 91-14-05) becomes effective on July 15, 1991.