AD 99-07-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Williams International Company, L.L.C. | FJ44-1A | Airworthiness Directives; Williams International, L.L.C. FJ44-1A Turbofan Engines |
Unsafe Condition
High Pressure Turbine (HPT) disk rim failure, which could result in an uncontained engine failure and damage to the aircraft.
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Required Actions
Remove HPT disk (part number 55291) from service prior to accumulating 1,900 cycles since new (CSN) and replace with a serviceable part. Alternatively, modify the HPT nozzle assembly and remark the disk per Williams Rolls Service Bulletin FJ44-72-36.
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Compliance Time
Before further flight if not already accomplished.
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Affected Aircraft
Williams International, L.L.C. FJ44-1A turbofan engines installed on but not limited to Cessna 525 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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