Airworthiness Directive · Amendment 39-17738 · Fuselage miscellaneous structure
Agusta S.p.A. Helicopters
This AD applies to Agusta Model AB139 and AW139 helicopters, with a wire strike protection system (WSPS) top cable cutter assembly, part number (P/N) 423-83001-1, installed, which is part of the WSPS, P/N 4G9540F00211 or P/N 4G9540F00311, certificated in any category.
We are adopting a new airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model AB139 and AW139 helicopters with a certain wire strike protection system (WSPS) top cable cutter assembly installed. This AD requires reworking or replacing the top cable cutter assembly to increase clearance between the WSPS and the main rotor (M/R) blades and requires that the reworked or replaced part be marked at the end of the part number to reflect the field modification. This AD was prompted by a report of in-flight contact between the top cable-cutter assembly and two M/R blades. The actions of this AD are intended to prevent damage to the M/R blades and subsequent loss of helicopter control.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Within 200 hours time-in-service, remove the WSPS upper installation, P/N 4G9540A00111, including top cable cutter assembly, P/N 423-83001-1.
(2) Before installing a WSPS upper installation, P/N 4G9540A00111, either:
(i) Rework the top cable cutter assembly, P/N 423-83001-1, in accordance with the Compliance Instructions, paragraph 3.1 through 3.5, and Figure 1 of Agusta Bolletino Technico No. 139-126, dated June 20, 2008. Re-identify the top cable cutter assembly in a visible and permanent way by adding “BT 139-126 Rev./” or “FAA” at the end of the part number; or
(ii) Replace the top cable cutter assembly, P/N 423-83001-1, with an airworthy top cable cutter assembly that has been reworked and re-identified in accordance with paragraph (e)(2)(i) of this AD.
(3) Do not install a top cable cutter assembly, P/N 423-83001-1, on any helicopter unless it has been reworked and re-identified in accordance with paragraph (e)(2)(i) of this AD.
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
