AD 82-25-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ALF502L | AVCO LYCOMING Models ALF502L, L-2, R-3, and R-4 Engines |
| engine | Honeywell International Inc. | ALF502L-2 | AVCO LYCOMING Models ALF502L, L-2, R-3, and R-4 Engines |
| engine | Honeywell International Inc. | ALF502L-2A | AVCO LYCOMING Models ALF502L, L-2, R-3, and R-4 Engines |
| engine | Honeywell International Inc. | ALF502L-2C | AVCO LYCOMING Models ALF502L, L-2, R-3, and R-4 Engines |
| engine | Honeywell International Inc. | ALF502R-3 | AVCO LYCOMING Models ALF502L, L-2, R-3, and R-4 Engines |
| engine | Honeywell International Inc. | ALF502R-3A | AVCO LYCOMING Models ALF502L, L-2, R-3, and R-4 Engines |
| engine | Honeywell International Inc. | ALF502R-4 | AVCO LYCOMING Models ALF502L, L-2, R-3, and R-4 Engines |
Unsafe Condition
Cracks in the first stage compressor stator vane airfoils and/or fourth stage turbine blade airfoils may result in engine failure or separation.
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Required Actions
Inspect the first stage compressor stator vane airfoils and fourth stage turbine blade airfoils for cracks. Repair or replace affected components as specified. Perform subsequent inspections at specified intervals.
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Compliance Time
Before further flight
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Affected Aircraft
Avco Lycoming models ALF502L, L-2, R-3, and R-4 engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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