Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain BAE Systems (Operations) Limited Model Avro 146-RJ and Model BAe 146 series airplanes. This proposal would require a test to determine the torque setting for the collar cap screw of the differential box for the nose landing gear, and follow-on actions. This action is necessary to prevent uncommanded inputs to the nosewheel steering, which could result in reduced controllability of the airplane during takeoff and landing. This action is intended to address the identified unsafe condition.