Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all BAE Systems (Operations) Limited Model BAe 146 airplanes and Model Avro 146-RJ airplanes. This proposed AD would require repetitive replacement of the elevator servo tab hinge bearings, elevator servo tab mechanism bearings, elevator trim tab hinge bearings, and elevator trim tab drive rod bearings with new bearings. This proposed AD results from reported incidents of flight control surface restrictions due to the deterioration of flight control surface bearings. We are proposing this AD to prevent corrosion of flight control surface bearings and freezing of moisture inside the bearings, due to loss of lubrication in the bearings, which could lead to flight control restrictions and result in reduced controllability of the airplane.