Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
airworthiness · Rule · Final rule. · Published 2013-10-25 · Effective 2013-11-29 · 78 FR 63858
Document
Document number
2013-24961
Federal Register citation
78 FR 63858
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2013-10-25
Effective date
2013-11-29
FAA docket
Docket No. FAA-2013-0500
Abstract
We are superseding Airworthiness Directive (AD) 2009-05-09 for Bell Model 412, 412CF, and 412EP helicopters. AD 2009-05-09 required reidentifying each affected part-numbered main rotor yoke (yoke) on its data plate, reducing the retirement life of the reidentified yoke, and revising the Airworthiness Limitations section of the maintenance manual or the Instructions for Continued Airworthiness (ICAs) accordingly. This new AD retains the requirements of AD 2009-05-09 with the exception of the P/N marking location. This AD was prompted by fatigue analysis that shows the retirement life should be reduced on certain yokes. We are issuing this AD to correct the unsafe condition on these helicopters.