Airworthiness Directives; Aerospace Lighting Corporation Power Units and Power Supplies

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This amendment supersedes an existing airworthiness directive (AD), applicable to certain Aerospace Lighting Corporation (ALC) lamp connectors and fluorescent lamps, that currently requires an inspection, and adjustment or replacement of improperly installed, damaged, or improperly configured lamp connectors and fluorescent lamps used in cabin fluorescent lighting systems. This amendment adds an optional replacement of certain power units and power supplies with new technology parts as terminating action to the repetitive inspections. This amendment is prompted by the availability of new technology components. The actions specified by this AD are intended to prevent smoke, fire, electrical shock, and possible electromagnetic interference caused by high voltage arcing in the cabin which, if undetected, could result in personal hazard or loss of the aircraft.