Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Raytheon Model Hawker 1000 series airplanes. This proposal would require modifying the aft core cowl nozzles of the engine nacelles. This proposal is prompted by a report indicating that the sealant on the core cowl nozzles may extend higher than the forward flange of the core cowl nozzles, which could result in contact between the cowl sealant surface and the lever of the engine mechanical over-speed control system. The actions specified by the proposed AD are intended to prevent such contact, which could cause result in the over-speed system to function improperly and consequent engine structural failure.