Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain British Aerospace Model BAe 146 series airplanes and Model Avro 146-RJ series airplanes. This proposal would require inspections to detect leakage of hydraulic fluid from the lock jack assemblies of the main landing gear (MLG), and eventual replacement of those assemblies with new or serviceable assemblies. This proposal is prompted by reports of leakage of hydraulic fluid from lock jack assemblies due to a manufacturing forging defect that extends through the wall of the lock jack assembly. The actions specified by the proposed AD are intended to prevent leakage of hydraulic fluid from the lock jack assemblies of the MLG, which, in conjunction with a hot brake, could cause a fire in the MLG bay.