Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to all British Aerospace HP137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes. The proposed AD would require inspecting the elevator bias spring assembly for correct installation and to assure that the correctly manufactured bias spring is installed. The proposed AD would also require replacing any incorrectly manufactured bias spring and reworking any incorrectly installed bias spring assembly, inspecting the link assembly for distortion or damage, and replacing any distorted and/or damaged parts. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by the proposed AD are intended to prevent failure of the bearings in the elevator down bias spring assembly caused by the installation of an incorrectly manufactured bias spring or damage or distortion to the assembly, which could result in reduced or loss of control of the airplane.