EASA Regulations for Textron Aviation 400 (Beechjet)

Engine Cowling System - Quarter-Turn Fastener Maintenance Information

The FAA Special Airworthiness Information Bulletin AIR-22-10 provides maintenance information regarding the engine cowling system quarter-turn fasteners on Textron Aviation Inc. turbofan-powered airplanes. These fasteners, used on engine nacelle cowl doors and related components, have been linked to incidents of cowl damage and separation, potentially affecting airplane handling. The bulletin addresses the hazards associated with improper installation and maintenance of these fasteners and offers guidance to pilots, owners, operators, and maintenance personnel.