Summary
The FAA proposes to supersede an existing airworthiness directive (AD) that affects certain Airbus Model A300 series airplanes and all Model A300-600 and A310 series airplanes. That AD currently requires repetitive inspections of the pitch trim system to detect continuity defects in the autotrim function, and follow-on corrective actions if necessary. For certain airplanes, this proposed AD would also require replacing the flight augmentation computers (FACs) with new improved FACs. This proposed AD also revises the applicability of the existing AD. This proposed AD results from the development of a final action intended to address the unsafe condition. We are proposing this AD to prevent a sudden change in pitch due to an out-of-trim condition combined with an autopilot disconnect, which could result in reduced controllability of the airplane.