AD Amdt-39-10652
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D Series | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
Unsafe Condition
Cracking of cooling air holes or tie bolt holes in first and second stage high pressure turbine (HPT) disks could lead to turbine disk failure and uncontained engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the AD to clarify affected part numbers (P/N) for second stage HPT hub assemblies, increase the repetitive inspection interval for first stage HPT disks, and follow referenced service bulletin procedures for inspections. Inspections include fluorescent penetrant inspections (FPI) for cracks in cooling air holes and tie bolt holes, with replacement of cracked disks.
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Compliance Time
Before further flight
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Affected Aircraft
Pratt & Whitney JT9D series turbofan engines with specified second stage HPT hub assemblies by part number and certain first stage HPT disks
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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