Airworthiness Directives; BAE Systems (Operations) Limited Model Avro 146-RJ Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain BAE Systems (Operations) Limited Model Avro 146- RJ series airplanes, that requires inspection to detect incorrect wiring of the fire extinguisher bottles located on the engines and on the auxiliary power unit (APU), and corrective action, as necessary. It also requires modification of the wiring of the fire extinguisher bottles located on the engines and on the APU. This amendment is prompted by reports of incorrect wiring of the fire extinguisher bottles on the engines and the APU discovered during routine maintenance. The actions specified by this AD are intended to prevent failure of the fire extinguisher bottles to discharge, which could result in the inability to extinguish a fire in the engines or in the APU.