Airworthiness Directive · Amendment 39-9525 · McDonnell Douglas Model DC-9-80 Series Airplanes
McDonnell Douglas Model DC-9-80 Series Airplanes
Model DC-9-80 series airplanes; as listed in McDonnell Douglas MD-80 Alert Service Bulletin A27-342, dated August 4, 1994, and in McDonnell Douglas MD-80 Alert Service Bulletin A27- 342, Revision 1, dated May 15, 1995; certificated in any category.
This amendment supersedes an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-80 series airplanes, that currently requires inspection and replacement of certain suspect horizontal stabilizer primary trim motors. That AD was prompted by an analysis which revealed that certain incorrectly manufactured motor shafts could fail prematurely and, in turn, cause the primary trim motor to fail. The actions specified in that AD are intended to prevent such failures of the primary trim motor, which could ultimately result in reduced controllability of the airplane. This amendment expands the applicability of the existing AD to include additional affected airplanes.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
