AD/BELL 412/39 Amdt 1 - Tail Rotor Yoke and Tail Rotor Flapping Stop/Indicator (Cth)

Bell Helicopter Textron 412 Series Helicopters

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BELL 412/39 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/BELL 412/39 Amdt 1

Tail Rotor Yoke and Tail Rotor Flapping Stop/Indicator

8/2001

Applicability: All Model 412, 412CF, and 412EP helicopters, with tail rotor yoke assembly, part number 212-011-702-all dash numbers, installed.

Requirement: 1. Review the historical records of the yoke assembly, for any static or dynamic overload damage that could have imposed a bending load on the yoke. The damage may not have required replacing the yoke assembly; for example, an incident in which a damaged tail rotor blade was replaced due to a blade strike. If the records indicate that overload damage may have occurred, replace the yoke with a serviceable yoke.

2. (a) Install a Never Exceed Velocity (Vne) red line at 120 knots indicated airspeed (KIAS) on the pilot and copilot airspeed indicators using red tape or paint, and a slippage indicator on the instrument case and glass.

(b) Install a placard made of material that is not easily erased, or disfigured, or obscured on the instrument panel in clear view of the pilot and copilot: