Airworthiness Directives; McDonnell Douglas Model MD-90-30 Airplanes

The FAA is revising an existing airworthiness directive (AD), which applies to certain McDonnell Douglas Model MD-90-30 airplanes. This AD requires a one-time general visual inspection to detect wire chafing damage and to determine adequate clearance between the disconnect panel structure and the wires above the aft left lavatory; and corrective actions, if necessary. This new AD revises the applicability of the existing AD. This AD is prompted by the determination that certain airplanes unaffected by the existing AD are subject to the unsafe condition, and certain other airplanes should be removed from the applicability. We are issuing this AD to prevent damage to certain wires due to contact between the wires and the adjacent structure, which could result in electrical arcing and consequent smoke and fire in the cabin.