Airworthiness Directives; McDonnell Douglas Model DC-9-10, -30, -30F, and -40 Series Airplanes, and Model C-9 Airplanes

This amendment supersedes an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-10, -30, and - 40 series airplanes and Model C-9 airplanes, that currently requires an inspection to detect chafing of the wiring of the attendants' work light of the aft cabin, and repair of chafed wiring. That AD also requires modification and reidentification of the attendants' work light assemblies of the aft cabin. This amendment revises the applicability of the existing AD. The actions specified by this AD are intended to prevent chafing of the ground wire against the positive contact of the lamp of the attendants' work light of the aft cabin, and consequent arcing or arcing damage to the wiring of the attendants' work light and transformer of the aft cabin. Such arcing or arcing damage could result in short circuits and consequent smoke and fire in the aft cabin area. The actions of this AD are intended to address the identified unsafe condition.