AD 2002-09-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | 4000 Series | Airworthiness Directives; Pratt & Whitney 4000 Series Turbofan Engines |
Unsafe Condition
Cracks in the knife edges and blade loading slots of 15th stage high pressure compressor (HPC) disks, which could lead to HPC disk failures and an uncontained engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Initial and repetitive borescope inspections of 15th stage HPC disks for cracks in knife edges. Eddy current inspections (ECI) of blade loading slots if required. Removal of cracked disks. Removal from service of affected disks at a new lower cyclic life limit.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Not specified in the source.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4090, PW4090-3, PW4074D, PW4077D, PW4090D, and PW4098 turbofan engines with 15th stage HPC disks having certain part numbers (P/N's).
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.