Summary
This document extends the period for public comment on the above-referenced NPRM that would apply to certain McDonnell Douglas Model DC-9 airplanes and Model MD-88 airplanes. The NPRM proposes to require replacement of certain power relays, and subsequent repetitive cleaning, inspecting, repairing, and testing of certain replaced power relays. The NPRM is prompted by reports indicating that the alternating current (AC) cross-tie relay shorted out internally, which caused severe smoke and burn damage to the relay, aircraft wiring, and adjacent panels. This extension of the comment period is necessary to assure that all interested persons have ample opportunity to present their views on the proposed requirements of the NPRM.