Airworthiness Directive · Amendment 39-9320 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company MD-11, MD-11F.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes an existing airworthiness directive (AD), applicable to all McDonnell Douglas Model MD-11 series airplanes, that currently requires a revision to the Airplane Flight Manual (AFM) that prohibits autoland operation below 100 feet above ground level, and installation of flight control computer software. It also provides for an optional terminating action for the AFM revision. This amendment provides for a new optional terminating action for the AFM revision. This amendment is prompted by reports of erroneous central aural warning system altitude callouts and erroneous radio altimeter indications during autoland approaches due to radio frequency leakage (RF) on airplanes on which the optional terminating action had been accomplished. The actions specified in this AD are intended to prevent radio altimeter antenna/coaxial cable RF leakage, which could result in early and/or abnormal flare (pitch) control during autoland operation and potential degradation of the landing capability of the airplane.
