Summary
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 767 series airplanes, that currently requires inspections to detect cracking and corrosion of the aft trunnion of the outer cylinder of the main landing gear (MLG) and various follow-on actions. That action also provides for the optional termination of the inspections by repairing the outer cylinder and installing new aft trunnion bushings. That AD was prompted by reports of failure of several MLG due to fractures of the aft trunnion outer cylinders. The actions specified by that AD are intended to prevent the collapse of the MLG due to stress corrosion cracking of the aft trunnion of the outer cylinder. This proposed action would require operators to implement the previously optional terminating action.