AD Amdt-39-10746
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4000 Series | Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan Engines |
Unsafe Condition
Cracking of the 2nd stage high pressure turbine (HPT) rotating airseals could result 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
Perform fluorescent penetrant and eddy current inspections of 2nd stage HPT rotating airseals for cracks, remove cracked parts from service, incorporate improved 2nd stage HPT rotating airseals, and modify 2nd stage ring segments and vane clusters to increase cooling flow and reduce stress.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4000 series turbofan engines subject to the specified conditions.
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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