AD 93-10-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ALF502L | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2A | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-2C | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502L-3 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-3 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-3A | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-4 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-5 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
| engine | Honeywell International Inc. | ALF502R-6 | TEXTRON LYCOMING Model ALF502R and ALF502L Series Engines |
Unsafe Condition
Corrosion and cracking of the third stage compressor disks could result in engine failure.
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Required Actions
Repair and mark, or replace, third stage compressor disks with specified part numbers at the next part exposure after the effective date, but no later than 7,500 cycles since new, in accordance with Textron Lycoming Service Bulletins ALF502R 72-259 or ALF502L 72-259.
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Compliance Time
at the next part exposure after the effective date of this AD, but no later than 7,500 cycles since new
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Affected Aircraft
Textron Lycoming ALF502R and ALF502L series turbofan engines installed on but not limited to British Aerospace BAe-146 and Canadair Challenger CL-600 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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