Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206L, 206L-1, and 206L-3 Series Helicopters

Résumé

This document revises an earlier proposed airworthiness directive (AD), applicable to Bell Helicopter Textron, Inc. (BHTI) Model 206A, 206B, 206L, 206L-1, and 206L-3 series helicopters, that would have required installing a protective mechanical fuel valve switch guard on the fuel valve switch. That proposal was prompted by reports of airmen inadvertently placing the fuel valve switch to the ``OFF'' position. This action revises the proposed rule by further proposing to require the installation of a protective mechanical fuel valve switch guard on an additional serial-numbered Model 206B helicopter, and further proposing that the rule apply to certain additional visual flight rule-equipped Model 206L-1 and 206L-3 helicopters. The actions specified by this proposed AD are intended to prevent the fuel valve switch from being inadvertently placed in the ``OFF'' position, which could result in an engine failure and a subsequent power-off landing.