AD 97-01-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Williams International Company, L.L.C. | FJ44-1A | Airworthiness Directives; Williams International, L.L.C. Model FJ44-1A Turbofan Engines |
Unsafe Condition
Cracks in high pressure turbine (HPT) disk blade retention posts due to material creep/fatigue, leading to separation of posts and liberation of turbine blades, resulting in loss of engine power and potential uncontained disk post and turbine blade liberation causing aircraft damage.
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Required Actions
Perform initial and repetitive eddy current inspections (ECI) for cracks in HPT disk blade retention posts per specified schedules. Install advanced design HPT disks (Part Number 55291) to replace existing disks (Part Number 48629) by July 1, 1997.
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Compliance Time
Initial compliance required within 50 cycles after January 21, 1997 or by February 1, 1997, whichever comes first. Repetitive inspections every 125 cycles in service. Advanced disks must be installed by July 1, 1997.
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Affected Aircraft
Williams International, L.L.C. Model FJ44-1A turbofan engines with serial numbers 1001-1179, 1196, and 1197.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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