Airworthiness Directives; Boeing Model 777-200 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 777-200 series airplanes, that requires replacement of certain overhead electronics units (OEU) of the passenger address and entertainment communication systems with modified OEU's. This amendment is prompted by reports of smoke coming from the overhead panels near the passenger reading lights, which was caused by overheating of the transformers located in the OEU's. The actions specified by this AD are intended to prevent overheating of the transformers, which potentially could cause a fire in the transformer assembly and/or electronic components located in the OEU and could cause smoke to enter the passenger cabin.