Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 777-200 series airplanes. This proposal would require replacement of certain overhead electronics units (OEU) of the passenger address and entertainment communication systems with modified OEU's. This proposal 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 the proposed 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.