Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all British Aerospace BAC 1-11-200 and -400 series airplanes. This proposal would require repetitive radiographic inspections to detect corrosion of the center torque shaft of the wing spoiler, and replacement, if necessary. This proposal is prompted by a report of the wing spoiler failing to retract fully after deployment, which caused the wing to drop significantly. Subsequent investigation revealed that the torque shaft assembly of the wing spoiler had failed, due to severe corrosion. The actions specified by the proposed AD are intended to prevent such failures, which can result in an adverse effect on controllability of the airplane.