Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all BAE Systems (Operations) Limited Model Avro 146-RJ series airplanes. This proposal would require replacing the existing digital flight guidance computer(s) (DFGC) with a new flight computer(s). This action is necessary to prevent a premature flare due to an erroneous reading by the DFGC(s) occurring at any point on the approach after 1,500 feet plus 10 seconds once category III landing status has been achieved, and subsequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.