Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to Jetstream Aircraft Limited (JAL) Jetstream Models 3101 and 3201 airplanes. The proposed action would require modifying the automatic airframe de-ice system to allow the wing and tail de-ice boots to automatically operate through one cycle. The present system repeats the wing de-ice boot inflation cycle before starting to inflate the tail de-ice boots. Reports of ice accumulating on the tail faster than the automatic tail de-ice boots inflate on the affected airplanes prompted the proposed action. The actions specified by the proposed AD are intended to prevent excessive ice accretion on the tail or wings of the affected airplanes, which could result in loss of control of the airplane.