Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain British Aerospace Model BAe 146-100A, -200A, and -300A airplanes. This proposal would require modification of the elevator control system of the flight controls. This proposal is prompted by reports of low frequency constant amplitude oscillations of the elevator control system and non-centering of the pitch control upon autopilot disconnect. The actions specified by the proposed AD are intended to prevent uncommanded descent upon autopilot disconnect and reduced controllability of the airplane [[Page 20460]] due to low frequency constant amplitude oscillations.