Summary
This document proposes adopting a new airworthiness directive (AD) for Eurocopter France (Eurocopter) Model SA-365N, N1, AS-365N2, AS 365 N3, SA-366G1, AS355 F, F1, F2, N, and EC130 B4 helicopters with certain TRW-SAMM main servocontrols (servocontrols) installed. This proposal would require removing the servocontrol and replacing it with a servocontrol that does not fall within the "Applicability" of this AD at specified intervals. This proposal is prompted by the discovery of an incorrect tightening torque load found on servocontrols that were overhauled by Hawker Pacific Aerospace. The actions specified by this proposed AD are intended to prevent thread failure, separation of the upper end fitting that attaches the servocontrol cylinder to the upper ball end-fitting, and subsequent loss of control of the helicopter.