airworthiness · Rule · Final rule; request for comments. · Published 2014-08-05 · Effective 2014-08-20 · 79 FR 45329
Document
Document number
2014-18298
Federal Register citation
79 FR 45329
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
AgustaWestland S.p.A.
Publication date
2014-08-05
Effective date
2014-08-20
FAA docket
Docket No. FAA-2014-0478
Abstract
We are publishing a new airworthiness directive (AD) for certain AgustaWestland S.p.A. Model AB139 and AW139 helicopters. This AD requires repetitively inspecting the Main Rotor (M/R) Rotating Scissors for play of the Lower Half Scissor Spherical Bearing (bearing) and removing the bearing if there is play beyond allowable limits. This AD also requires removing all affected bearings. This AD is prompted by reports of certain bearings dislodging from certain M/R Rotating Scissors. These actions are intended to detect excessive play of the bearing and prevent failure of the M/R Rotating Scissors and subsequent loss of control of the helicopter.