Airworthiness Directives; Pratt & Whitney PW4164, PW4168, and PW4168A Series Turbofan Engines
airworthiness · Rule · Final rule; request for comments. · Published 1998-02-26 · Effective 1998-03-13 · 63 FR 9730
Document
Document number
98-3799
Federal Register citation
63 FR 9730
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Publication date
1998-02-26
Effective date
1998-03-13
FAA docket
Docket No. 97-ANE-44-AD
Abstract
This amendment adopts a new airworthiness directive (AD) that is applicable to Pratt & Whitney PW4164, PW4168, and PW4168A series turbofan engines. This action requires initial and repetitive inspections for loose or broken front pylon mount bolts, replacement, if necessary, with new bolts, and establishment of a new cyclic life limit. This amendment is prompted by new flight test data that indicate higher than predicted loads. The actions specified in this AD are intended to prevent front pylon mount bolt failure, which could result in engine separation from the aircraft.