Airworthiness Directives; Airbus Model A320 and A321 Series Airplanes

This amendment supersedes an existing airworthiness directive (AD), applicable to all Airbus Model A320 series airplanes, that currently requires revising the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to instruct the flight crew to maintain a flap setting of ``Configuration Full'' (CONF FULL) during landing. That AD was prompted by a report of severe control difficulties which occurred on approach with the flaps locked in CONF FULL and the landing gear down. This amendment adds a requirement for installation of a new, improved flight warning computer (FWC), which, when accomplished, constitutes terminating action for the AFM limitation. This action also revises the applicability of the existing AD to include additional airplanes that are subject to the addressed unsafe condition. The actions specified by this AD are intended to prevent reduced controllability of the airplane during approach when the flaps are locked in CONF FULL.