AD 93-14-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ALF502L | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502L-2 | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502L-2A | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502L-2C | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502L-3 | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502R-3 | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502R-3A | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502R-4 | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502R-5 | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
| engine | Honeywell International Inc. | ALF502R-6 | TEXTRON LYCOMING Models ALF502R and ALF502L Engines |
Unsafe Condition
Third stage turbine disk failure, which could result in engine shutdown.
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Required Actions
Rework the third stage turbine disk blade slots and mark the assembly with a new part number per Textron Lycoming Service Bulletin, or replace with a serviceable part. Compliance must be within specified cycles in service (CIS) based on the disk's cycles on the AD effective date.
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Compliance Time
Compliance required within 1,000 CIS after the effective date for disks with 15,000+ CIS; within 1,000 CIS or next shop visit (later) but before 16,000 CIS for 10,000-15,000 CIS; at next blade removal before 13,000 CIS for less than 10,000 CIS.
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Affected Aircraft
Textron Lycoming ALF502R and ALF502L turbofan engines installed on British Aerospace BAe-146 and Canadair Challenger CL600 aircraft, with specific part numbers on third stage turbine rotor shaft assemblies.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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