AD 2012-06-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Division | Airworthiness Directives; Pratt & Whitney Division Turbofan Engines |
Unsafe Condition
Reports of five engine in-flight shutdowns and seven unplanned engine removals due to clogging of No. 4 bearing compartment oil pressure and scavenge tubes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and clean the No. 4 bearing compartment within 1,000 cycles-in-service after the effective date, and re-inspect and clean every additional 1,000 cycles. At the next engine shop visit (but not to exceed 5 years after the effective date), replace and modify components as specified, including the No. 4 bearing packing transfer tube assembly, internal scavenge tube assembly, pressure and scavenge tubes, turbine exhaust case ports, and turbine case cooling brackets.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 1,000 cycles-in-service for inspections and cleaning; at the next engine shop visit (but not to exceed 5 years) for modifications.
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Affected Aircraft
All Pratt & Whitney PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines, including models with any dash number suffix, that have not incorporated Pratt & Whitney Alert Service Bulletin No. PW4ENG-A72-436, Service Bulletin No. PW4ENG-79-76, and Service Bulletin No. PW4ENG-72-472.
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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