Airworthiness Directives; Agusta S.p.A. Model A109A, A109A II, A109C, and A109K2 Helicopters
airworthiness · Rule · Final rule; request for comments. · Published 2011-08-26 · Effective 2011-09-12 · 76 FR 53324
Document
Document number
2011-21476
Federal Register citation
76 FR 53324
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Publication date
2011-08-26
Effective date
2011-09-12
FAA docket
Docket No. FAA-2011-0823
Abstract
This amendment supersedes an existing emergency airworthiness directive (EAD) for the specified Agusta S.p.A. (Agusta) model helicopters. That EAD currently requires inspecting the main rotor scissor fitting assembly to determine if there are 2 washers installed under the head of each main rotor scissor fitting assembly fixing bolt (fixing bolt). If there are not 2 washers installed under the head of each fixing bolt, that EAD requires replacing each fixing bolt and installing 2 washers under the head of each fixing bolt. This superseding airworthiness directive (AD) is prompted by the determination that a wrong part number (P/N) for the main rotor scissor fitting assembly was listed in the EAD. This AD retains the requirements of the EAD and corrects a P/N for the main rotor scissor fitting assembly. The actions specified by this AD are intended to prevent a crack in a fixing bolt, failure of a fixing bolt, and subsequent loss of control of the helicopter.