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

The FAA is superseding two existing airworthiness directives (ADs); both apply to the same certain McDonnell Douglas Model MD-90-30 airplanes. The superseded ADs currently require a one-time general visual inspection to detect wire chafing damage and to determine adequate clearance between the disconnect panel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 retains those requirements and clarifies certain requirements for recording AD compliance. This AD is prompted by the determination that the form of the existing ADs could result in confusion to operators in recording compliance with the potentially conflicting requirements. 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.