Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 767 airplanes. This proposed AD was prompted by reports of bearing damage at certain trailing edge (TE) flap support rib assemblies. This proposed AD would require inspecting certain TE flap support rib assemblies to determine if the bearings have a roller retention feature, and performing corrective actions if necessary; and inspecting for bearing damage of each pair of removed bearings, and performing related investigative and corrective actions if necessary. We are proposing this AD to detect and correct damage to the TE flap support bearings, which can result in damage to the TE rotary actuators and consequent dual flap drive system disconnect in both TE flap rotary actuators, and a possible flap aerodynamic blowback with loss of controllability of the airplane.