AD 86-07-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ALF502L | AVCO LYCOMING DIVISION Model ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2 | AVCO LYCOMING DIVISION Model ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2A | AVCO LYCOMING DIVISION Model ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2C | AVCO LYCOMING DIVISION Model ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-3 | AVCO LYCOMING DIVISION Model ALF502L Series Engines |
Unsafe Condition
Engine power loss due to release of fourth stage compressor vane airfoils into the compressor flow path caused by vane cracking at the outer shroud.
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Required Actions
Inspect the fourth stage compressor vane assemblies with Avco Lycoming Part Number 2-100-040-27 for vane cracking at the outer shroud per SB ALF502L-72-0137. Remove from service vane assemblies with missing, cracked, or separated vane airfoils prior to further flight.
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Compliance Time
Within the next 50 hours time in service after the effective date of this AD unless already accomplished within the last 50 hours time in service, and thereafter at intervals not to exceed 100 hours time in service from the last inspection.
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Affected Aircraft
Avco Lycoming ALF502L series turbofan engines including models ALF502L, ALF502L-2, ALF502L-2A, ALF502L-2C, and ALF502L-3.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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