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 a visual inspection to verify proper clearance between the number 18 fuel nozzle secondary transfer fuel tube and the pylon drain tube of the engine, and various follow-on actions. The proposal would also require installation of clamps and associated fasteners between the environmental control system (ECS) controller tube and the pylon drain tube. This proposal is prompted by reports of chafing of the number 18 fuel nozzle secondary transfer fuel tube of the engine due to an improperly installed or loose pylon drain tube. The actions specified by the proposed AD are intended to prevent such chafing, which could lead to subsequent fuel leakage and a possible engine fire.