Airworthiness Directive · Amendment 39-16765 · Agusta S.p.A. Model A109A, A109A II, A109C, and A109K2 Helicopters
Agusta S.p.A. Model A109A, A109A II, A109C, and A109K2 Helicopters
Model A109A, A109A II, A109C, and A109K2 helicopters, certificated in any category.
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.
To prevent a crack in a main rotor scissor fitting assembly fixing bolt (fixing bolt), failure of a fixing bolt, and subsequent loss of control of the helicopter, accomplish the following:
(a) Within 5 hours time-in-service (TIS), inspect the main rotor scissor fitting assembly, part number (P/N) 109-0110-67 or P/N 109-0101-58, to determine if there are 2 washers, P/N NAS1149C0432R and P/N NAS1149C0463R, installed under the head of each fixing bolt, P/N 109-0101-78-5, as depicted in Figure 1 of Agusta Mandatory Alert Bollettino Tecnico (BT) No. 109K-53 for Model A109K2 helicopters, and Mandatory Alert BT No. 109-131 for Model A109A, A109A II, and A109C helicopters, both dated December 18, 2009.
(b) If 2 washers are not installed under the head of each fixing bolt, within 25 hours TIS of complying with paragraph (a) of this AD, replace each fixing bolt and install 2 washers under the head of each fixing bolt as depicted in Figures 1 and 2, and by following the Compliance Instructions, Part II, paragraphs 1. through 3.5., of the BT for your helicopter.
(c) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Contact the Manager, Safety Management Group, ATTN: DOT/FAA Southwest Region, Sharon Miles, Aviation Safety Engineer, Rotorcraft Directorate, ASW-111, 2601 Meacham Blvd., Fort Worth, Texas 76137, telephone (817) 222-5122, fax (817) 222-5961, for information about previously approved alternative methods of compliance.
(d) The Joint Aircraft System/Component Code is 6220: Main Rotor Head.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
