Regulacje i polityka gospodarcza · 16.10.2002

Airworthiness Directives; Boeing Model 747 Series Airplanes

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all Boeing Model 747 series airplanes, that currently requires periodic inspections and cleaning of the drainage system cavity of the canted pressure deck, aft of the wing center section. This action would add new repetitive tests and inspections for discrepancies of the drainage system of the canted pressure deck located in the wheel wells of the main landing gear (MLG) of the left and right wings; and corrective actions, if necessary. The action would also terminate the requirements of the existing AD. The actions specified by the proposed AD are intended to prevent ice accumulation on the lateral flight control cables due to water entering the wheel well of the MLG and freezing, which could restrict or jam control cable movement, resulting in loss of controllability of the airplane.