# AD 93-10-07: Third Stage Compressor Disks

- Type: Airworthiness directive
- Status: Current
- Products: Honeywell International ALF502L, ALF502L-2, ALF502L-2A, ALF502L-2C, ALF502L-3, ALF502R-3, ALF502R-3A, ALF502R-4, ALF502R-5 and ALF502R-6
- Effective: August 10, 1993
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-8587
- Docket: 91-ANE-53
- Registered aircraft: 43 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D47A19E166D69081862568620064F707.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/93-10-07

## The airworthiness directive

93-10-07 TEXTRON LYCOMING: Amendment 39-8587. Docket 91-ANE-53. Applicability: Textron Lycoming ALF502R and ALF502L series turbofan engines installed on but not limited to British Aerospace BAe-146 and Canadair Challenger CL-600 aircraft. Compliance: Required as indicated, unless accomplished previously. To prevent corrosion and cracking of the third stage compressor disks, that could result in engine failure, accomplish the following: (a) Repair and mark, or replace, third stage compressor disks, Part Number (P/N) 2-101-263-02, P/N 2-101-263-05, P/N 2-101-263-09, P/N 2-101-263-R10, or third stage disk assemblies P/N 2-101-630-04, P/N 2-101-630-05, P/N 2-101-630-08; at the next part exposure, after the effective date of this AD, but no later than, 7,500 cycles since new, in accordance with Textron Lycoming Service Bulletin No. ALF502R 72-259, dated August 13, 1991, or Service Bulletin No. ALF502L 72-259, dated August 13, 1991, as applicable. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office. The request should be forwarded through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. NOTE: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The repairing and marking, or replacement shall be done in accordance with the following Textron Lycoming service bulletins:

Document No. Pages Date ALF502R 72-259 1-5 August 13, 1991 Total pages: 5

ALF502L 72-259 1-5 August 13, 1991 Total Pages: 5

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 Textron Lycoming, Stratford Division, 550 Main Street, Stratford, CT 06497-7593. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street NW., suite 700, Washington, DC. (e) This amendment becomes effective on August 10, 1993.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E6NE](https://openairdocs.org/tcds/E6NE): CFS Aeroproducts Inc.; names 10 of 12 models: ALF502L-2C, ALF502R-6, ALF502L-2A, ALF502L-3, ALF502R-3, ALF502R-5, ALF502R-3A, ALF502R-4…

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 43 (0 by airframe model, 43 by engine model)
- Makers: Canadair 33, British Aerospace 10

Models with the most aircraft:

- [Lycoming ALF-502 SER. series](https://openairdocs.org/engine/lycoming-alf-502-ser-series): 25 aircraft (engine model)
- [Honeywell ALF-502 series](https://openairdocs.org/engine/honeywell-alf-502-series): 4 aircraft (engine model)
- [Lycoming ALF502L](https://openairdocs.org/engine/lycoming-alf502l): 4 aircraft (engine model)
- [Lycoming ALF502R-5](https://openairdocs.org/engine/lycoming-alf502r-5): 4 aircraft (engine model)
- [Honeywell ALF502R-5](https://openairdocs.org/engine/honeywell-alf502r-5): 2 aircraft (engine model)
- [Lycoming ALF502L-2C](https://openairdocs.org/engine/lycoming-alf502l-2c): 2 aircraft (engine model)
- [Alliedsign ALF502L-2C](https://openairdocs.org/engine/alliedsign-alf502l-2c): 1 aircraft (engine model)
- [Lycoming ALF502L-2](https://openairdocs.org/engine/lycoming-alf502l-2): 1 aircraft (engine model)

All 8 models: https://openairdocs.org/ad/93-10-07/models.md
Every aircraft: https://openairdocs.org/ad/93-10-07/aircraft.md

Its text cites no advisory circulars or STCs.

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