AD Amdt-39-11029
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D Series | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
Unsafe Condition
Cracks in the rear skirt of the diffuser case can lead to diffuser case rupture during takeoff roll, resulting in an uncontained engine failure and damage to the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the rear skirt of the diffuser case using fluorescent penetrant inspection (FPI) for cracks. If cracks are found, blend down to minimum wall thickness to remove cracks, followed by another FPI to verify crack removal. Polish and shotpeen the area. If cracks persist after re-inspection, remove the diffuser case from service and replace it with a serviceable part.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Pratt & Whitney JT9D series turbofan engines, as specified in the AD.
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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