AD 2003-26-09
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 distressed HPT assembly hardware remaining in service 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. Initial and repetitive visual inspections of the turbine exhaust case (TEC) and borescope inspections of the No. 3 bearing oil vent tube assembly for evidence of oil wetting or staining. Borescope inspections of the HPT assembly if vent tube borescope inspection is unsuccessful due to blockage. Removal of the HPT assembly and replacement of any heat distressed HPT assembly 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.
AI-generated summary from the source AD text. Verify against the official source before acting.
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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