Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 727-100 and - 200 series airplanes. This proposal would require replacing the attachin-nutplates on certain engine nose cowls with washers and self- locking nuts. This proposal is prompted by reports indicating that nose cowls separated (or nearly separated) from the engines of certain airplanes following failure of the engine fan blade and subsequent vibration of the engine, which caused loosening of the attach bolts on the nose cowl of the engine. The actions specified by the proposed AD are intended to prevent the attach bolts from becoming loose, which could result in subsequent separation of the nose cowl from the engine.