AD T83-03-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ALF502L | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502L-2 | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502L-2A | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502L-2C | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502L-3 | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502R-3 | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502R-3A | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502R-4 | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502R-5 | AVCO LYCOMING Model ALF502 Series Engines |
| engine | Honeywell International Inc. | ALF502R-6 | AVCO LYCOMING Model ALF502 Series Engines |
Unsafe Condition
Fourth stage turbine rotors assembly P/N 2-141-170-23 or -27 may have blades that do not meet the etch inspection requirements, leading to potential failure.
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Required Actions
Remove all fourth stage turbine rotors assembly P/N 2-141-170-23 or -27 and replace with a rotor that has satisfactorily met the etch inspection requirements per Service Bulletin ALF502-72-0038. Ferrying is allowed under FAR 21.197.
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Compliance Time
within the next 10 engine operating hours
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Affected Aircraft
Avco Lycoming ALF502 series model turbofan engines with less than 100 hours total operating time.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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