Airworthiness Directives; McDonnell Douglas Model MD-11 and -11F Airplanes

This amendment supersedes an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-11 and -11F series airplanes, that currently requires repetitive inspections to verify operation of the remote control circuit breakers (RCCB) of the alternating current (AC) cabin bus switch, and replacement of any discrepant RCCB with a new RCCB. This amendment requires the existing actions per a later service bulletin revision. The actions specified by this AD are intended to prevent propagation of smoke and fumes in the cockpit and passenger cabin due to one or more inoperable RCCBs of the AC cabin bus switch during smoke and fume isolation procedures. This action is intended to address the identified unsafe condition.