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 series airplanes. This proposal would require a one-time inspection of the S4 and S5 static pipes of the pitot static system for discrepancies, and follow-on corrective actions, if necessary. This action is necessary to prevent such discrepancies, which could result in holes in the static pipes, erroneous input to the instrumentation and warning systems associated with the pilot's instruments, and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.