airworthiness · Rule · Final rule. · Published 2006-11-02 · Effective 2006-12-07 · 71 FR 64441
Document
Document number
E6-18368
Federal Register citation
71 FR 64441
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2006-11-02
Effective date
2006-12-07
FAA docket
Docket No. FAA-2006-24487
Abstract
The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, PW4090-3, and PW4098 turbofan engines, with certain front turbine hub part numbers installed. This AD requires a onetime visual inspection of the anti-rotation slots in the front turbine hub, for a machining nonconformance, and its replacement if the inspection failed. This AD results from a report of a crack found in an anti-rotation slot of a front turbine hub, during overhaul shop inspection. The anti-rotation slot geometry was not machined in conformance with the design drawing during manufacture. We are issuing this AD to prevent uncontained engine failure, damage to the airplane, and injury to passengers.