Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all BAE Systems (Operations) Limited (Jetstream) Model 4101 airplanes. This proposed AD would require replacing the aileron trim chain with a new, improved aileron trim chain, and modifying the installation of the aileron trim chain. This proposed AD is prompted by a report that the aileron trim cables were connected incorrectly on a correctly installed aileron trim chain. We are proposing this AD to prevent incorrect connection of the aileron trim cables, which could result in failure of the aileron trim system and consequent reduced controllability of the airplane.