Airworthiness Directive · Amendment 39-9174 · McDonnell Douglas Model DC-9-80 Series Airplanes
McDonnell Douglas Model DC-9-80 Series Airplanes
Superseded. A later AD replaced this one: AD 96-05-01. Comply with the one in force.
Model DC-9-80 series airplanes; as listed in McDonnell Douglas MD-80 Alert Service Bulletin A27-342, dated August 4, 1994; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to McDonnell Douglas Model DC-9-80 series airplanes, that requires inspection and replacement of certain suspect horizontal stabilizer primary trim motors. This amendment is 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 by this AD are intended to prevent such failures of the primary trim motor, which could ultimately result in reduced controllability of the airplane.
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.
