Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Airbus Model A320 and A321 series airplanes. This proposal would require a revision to the Airplane Flight Manual (AFM) to include procedures for the flightcrew to follow in the event of radio altimeter height malfunction. This proposal also would require replacement of certain radio altimeter antennas with improved antennas, at which time the AFM revision would no longer be required. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent output of erroneous radio altimeter height information to the flightcrew and autopilot, which could result in reduced ability of the flightcrew to cope with adverse operating conditions.