Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Aerospatiale Model ATR42-200, -300, -320, -500, and ATR72 series airplanes. This proposal would require a revision of the Airplane Flight Manual to add instructions that prohibit the flightcrew from selecting the reverse position on the engines in the event of propeller thrust dissymmetry. This action is necessary to ensure that the flightcrew is advised of the hazard associated with selecting reverse thrust during propeller thrust dissymmetry, which could result in reduced controllability of the airplane during landing. This action is intended to address the identified unsafe condition.