Airworthiness Directive · Amendment 39-9934 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), MD-88, MD-90-30.
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 DC-9-80 series airplanes, Model MD-88 airplanes, and Model MD-90 airplanes, that currently requires revising the Airplane Flight Manual (AFM) to include limitations and procedures to address situations in which the autopilot or autothrottle fails to disengage. That AD was prompted by incidents in which the flightcrew was unable to disconnect the autopilot or autothrottle function from the engaged position, due to a discrepancy in a microswitch that is associated with the operation of those functions. This amendment requires an inspection of the autopilot and autothrottle engage switches located in the flight guidance control panel, and installation of improved switches. Accomplishment of these actions will terminate the previous requirement for the AFM revision. The actions specified by this AD are intended to ensure that the autopilot and autothrottle disengage when commanded to do so by the flightcrew.
