AD 2003-22-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4074 | Airworthiness Directives; Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084, PW4084D, PW4090, PW4090D, PW4090-3, and PW4098 Turbofan Engines |
Unsafe Condition
Thermal distress of the high pressure turbine (HPT) assembly hardware due to ignition of oil leaking from the No. 3 bearing compartment, which could result in a cracked HPT stage 1 disk or HPT stage 1-2 air seal and an uncontained engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Borescope inspection of the No. 3 bearing weep tube on engines with high oil consumption where troubleshooting fails to identify the oil loss source. Initial and repetitive visual inspections of the turbine exhaust case (TEC) near the No. 3 bearing oil vent tube for oil wetting or staining. Borescope inspections of the HPT assembly if the vent tube inspection is blocked. Removal and replacement of the HPT assembly and any heat-distressed hardware if oil wetting or staining is found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours after the effective date of the AD.
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Affected Aircraft
Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084, PW4084D, PW4090, PW4090D, PW4090-3, and PW4098 turbofan engines.
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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