Transport i infrastruktura · 18/10/1994

Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to McDonnell Douglas Model DC-9-80 series airplanes. This proposal would require the replacement of certain suspect horizontal stabilizer primary trim motors. This proposal 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 the proposed AD are intended to prevent such failures of the primary trim motor, which could ultimately result in reduced controllability of the airplane.