Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 767 series airplanes. This proposal would require modification of the canted pressure deck drain system in the wheel well of the main landing gear (MLG). This proposal is prompted by reports of ice accumulation on the aileron control cables and on the MLG door and door seal, during flight, due to fluid entering the canted pressure deck area, leaking into the MLG wheel well, and freezing. The actions specified by the proposed AD are intended to prevent such ice accumulation, which could render one of the aileron control systems and/or the MLG doors inoperative, resulting in reduced controllability of the airplane.