AD 77-07-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-9 | PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines |
| engine | Pratt & Whitney Division | JT8D-9A | PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines |
Unsafe Condition
Interference between the fourth stage turbine stator and rotor due to possible intermixing of different material stators.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for and replace all fourth stage stator vanes not FAA approved for that engine model.
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Compliance Time
prior to the accumulation of 6000 hours time in service after February 20, 1975
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Affected Aircraft
Pratt & Whitney Aircraft JT8D-9 and -9A engines with specified serial numbers listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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