AD 2006-22-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4074 | Airworthiness Directives; Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, PW4090-3, and PW4098 Turbofan Engines |
Unsafe Condition
A crack found in an anti-rotation slot of a front turbine hub during overhaul shop inspection, due to the anti-rotation slot geometry not being machined in conformance with the design drawing during manufacture.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a one-time visual inspection of the anti-rotation slots in the front turbine hub for extra fillet radii. Remove from service any front turbine hub with extra fillet radii and install a serviceable front turbine hub.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next disassembly at piece-part level of the front turbine hub after the effective date of this AD, unless the actions have already been done.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, PW4090-3, and PW4098 turbofan engines, with front turbine hub part numbers 50L761, 52L701, 55L221, 52L901, 53L121, 55L521, and 53L021 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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