Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to certain Boeing transport category airplanes listed above, that would have required drilling witness holes through the cowl skin at the cowl latch locations in the left-hand side of the cowl panel assembly of each engine. This new action revises the proposed rule by adding certain airplanes and removing certain JT9D engines from the applicability. The actions specified by this new proposed AD are intended to prevent improper connection of the latch, which could result in separation of a cowl panel from the airplane. Such separation could cause damage to the airplane, consequent rapid depressurization, and hazards to persons or property on the ground. This action is intended to address the identified unsafe condition.