Airworthiness Directives; Bombardier Model CL-600-2B16 Series Airplanes

This document confirms the effective date of a direct final rule published on March 27, 1998 which revised an existing airworthiness directive (AD), applicable to certain Bombardier Model CL-600-2B16 series airplanes, that currently requires disabling the remote fuel/defuel panel in the cockpit; and provides for an optional modification of the remote fuel/defuel panel, which would terminate the requirement to disable the panel. The direct final rule amendment reduces the applicability of the existing AD. The direct final rule amendment was prompted by reports of in-flight failure of the panel that resulted when a circuit breaker on a battery bus opened due to insufficient current flow capacity. The actions specified in this AD are intended to prevent the circuit breakers from opening during flight, which could result in irreversible loss of engine indicating and fuel quantity systems in the cockpit.