Summary
This document proposes the supersedure of two existing airworthiness directives (AD), that are applicable to certain transport category airplanes equipped with certain Honeywell Standard Windshear Detection Systems (WSS). Those AD's currently require a revision to the FAA-approved Airplane Flight Manual (AFM) to alert the flight crew of the potential for significant delays in the WSS detecting windshear when the flaps of the airplane are in transition. Those AD's were prompted by a report of an accident during which an airplane encountered severe windshear during a missed approach. This action would require that the currently-installed line replaceable unit (LRU) be replaced with a modified LRU having new software that eliminates delays in the WSS detecting windshear when the flaps of the airplane are in transition. The actions specified by the proposed AD are intended to prevent significant delays in the WSS detecting hazardous windshear, which could lead to the loss of flight path control.