Airworthiness Directive · Amendment 39-17076 · Main rotor control
AGUSTA S.p.A. Helicopters
This AD applies to Agusta S.p.A. (Agusta) Model AW139 helicopters, serial number (S/N) 31306, 31314, 31317, 31319, 31320, 31322, 31323, and S/N 31325 through 31345 (except S/N 31329, 31333, 31338, 31339, and 31341), certificated in any category.
We are adopting a new airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model AW139 helicopters to determine if the hardware that attaches the upper end of collective control rod C2 to torque tube C3 is properly installed. This AD is prompted by the discovery of an incorrectly-attached collective control rod. These actions are intended to prevent separation of the collective control rod from the torque tube, loss of control of the collective pitch, and subsequent loss of control of the helicopter.
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 5 hours time-in-service (TIS) or 7 days, whichever occurs earlier, inspect the connection between the collective control rod C2 and the torque tube C3 for proper installation of the: bolt, part number (P/N) NAS6604D15; washer under the bolt head, P/N A160A0432K; self-locking nut, P/N MS17825-4; washer under the self-locking nut, P/N NAS1149D0432K; and the cotter pin, P/N MS24655-136, as depicted in Figures 1 and 2, of Agusta Bollettino Tecnico No. 139-275, dated December 1, 2011, (ABT 139-275).
(2) If the connection between the collective control rod C2 and the torque tube C3 is not as depicted in Figures 1 and 2 of ABT 139-275, before further flight, properly connect control rod C2 to torque tube C3. In order to obtain the correct bolt grip length and cotter pin installation, you may use a maximum of 2 washers, P/N NAS1149D0432K, under the self-locking nut.
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
