AD 2021-14-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Turbofan | Airworthiness Directives; Pratt & Whitney Turbofan Engines |
Unsafe Condition
cracks in the knife edge of the high-pressure turbine (HPT) 2nd-stage air seal assembly due to seal rubbing that elevated the HPT 2nd-stage air seal assembly temperature and induced fatigue.
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Required Actions
fluorescent penetrant inspections (FPIs) and visual inspections of the HPT 2nd-stage air seal assembly, and depending on the results of the inspections, replacement of the HPT 2nd-stage air seal assembly with a part eligible for installation, and replacement of the affected HPT 2nd-stage air seal assembly, depending on the engine model, at either the next engine shop visit or the next piece-part opportunity.
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Compliance Time
Within 500 flight cycles after the effective date of this AD
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Affected Aircraft
All Pratt & Whitney (PW) PW2037, PW2037M, PW2040, and F117-PW-100 model turbofan engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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