Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes

This amendment supersedes an existing airworthiness directive (AD), applicable to all Airbus Model A310 and A300-600 series airplanes, that currently requires a revision to the FAA-approved Airplane Flight Manual (AFM) that warns the flight crew about certain consequences associated with overriding the autopilot while it is in the COMMAND mode or in the pitch axis. That AD also requires modification of certain flight control computers (FCC). This amendment requires replacement of the currently required revision to the AFM with a newly worded revision that explains the effect the modification of the FCC's has on the operation and performance of the autopilot and that clarifies the limitation for unmodified airplanes. This amendment is prompted by the results of an FAA review of the requirements of the existing AD. The actions specified by this AD are intended to prevent an out-of-trim condition between the trimmable horizontal stabilizer and the elevator, which could severely reduce controllability of the airplane.