AD 2003-13-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4074 | Airworthiness Directives; Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4090, and PW4090-3 Turbofan Engines |
Unsafe Condition
Cracks propagating from bolt holes in the HPC rear case J flange, and cracks propagating into the shell wall of high-cycle HPC rear cases.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial and repetitive visual or fluorescent penetrant inspections (FPI) of the J flange on HPC rear cases, P/Ns 55H425-01, 55H385-01, and 56H396-01, at specified bolt hole locations. Remove the rear case from service based on certain inspection results.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified compliance times as detailed in the AD's Table 1 for initial inspections, and subsequent repetitive inspections as outlined in the service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4090, and PW4090-3 turbofan engines with HPC rear cases, P/Ns 55H425-01, 55H385-01, and 56H396-01 installed.
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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