Airworthiness Directives; British Aerospace Model Avro 146-RJ Series Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to certain British Aerospace Model Avro 146-RJ series airplanes. This action requires a revision to the FAA-approved Airplane Flight Manual (AFM) to alert the flightcrew of the potential for significant delays in the Honeywell Standard Windshear Detection and Recovery Guidance System (WSS) detecting windshear when the flaps of the airplane are in transition. This amendment is prompted by a report of an accident during which an airplane encountered severe windshear during a missed approach. The actions specified in this AD are intended to ensure that the flightcrew is aware that there may be significant delays in the WSS detecting windshear when the flaps of the airplane are in transition.