AD 95-03-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ALF502R-3 | Airworthiness Directives; Textron Lycoming ALF502R Series Turbofan Engines |
| engine | Honeywell International Inc. | ALF502R-3A | Airworthiness Directives; Textron Lycoming ALF502R Series Turbofan Engines |
| engine | Honeywell International Inc. | ALF502R-4 | Airworthiness Directives; Textron Lycoming ALF502R Series Turbofan Engines |
| engine | Honeywell International Inc. | ALF502R-5 | Airworthiness Directives; Textron Lycoming ALF502R Series Turbofan Engines |
| engine | Honeywell International Inc. | ALF502R-6 | Airworthiness Directives; Textron Lycoming ALF502R Series Turbofan Engines |
Unsafe Condition
Cracks in No. 2 stage turbine disk and No. 1 and No. 3 through No. 7 stage compressor rotor disks could result in disk failure and possible uncontained engine failure.
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Required Actions
Remove from service and replace No. 2 stage turbine disks (P/Ns 2-121-058-18, 2-121-058-20, 2-121-058-R24) with cycle accumulation ≤10,000 cycles. Remove and replace No. 1 (P/N 2-101-331-04), No. 3 (P/Ns 2-101-263-02, 2-101-263-05, 2-101-263-06, 2-101-263-09, 2-101-263-R10), No. 4 (P/Ns 2-100-042-03, 2-100-042-07, 2-100-042-09, 2-100-042-R08), No. 5 (P/Ns 2-100-043-01, 2-100-043-07, 2-100-043-09, 2-100-043-R08), No. 6 (P/Ns 2-100-044-01, 2-100-044-05, 2-100-044-07, 2-100-044-R06), and No. 7 (P/Ns 2-100-045-01, 2-100-045-05, 2-100-045-07, 2-100-045-R06) stage compressor rotor disks with cycle accumulation not exceeding their respective reduced service life limits (12,500; 11,800; 9,000; 12,300; 12,500; 9,200 cycles). Actions must follow Textron Lycoming SB ALF502R 72-281 dated February 7, 1992.
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Compliance Time
Required as indicated in the service bulletin, unless accomplished previously.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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