EASA SIB AIR-22-10: Engine Cowling System - Quarter-Turn Fastener Maintenance Information

What to do

Pilots should perform thorough pre-flight inspections focusing on quarter-turn fasteners, while maintenance personnel must conduct repetitive inspections and verify correct fastener engagement after any cowl removal. Operators should follow manufacturer recommendations and consult experienced repair stations for any cowl system repairs. There are no specific compliance deadlines stated in the bulletin.

Summary

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.

What changed

This bulletin introduces awareness and recommendations concerning the maintenance and inspection of quarter-turn fasteners on Textron turbofan-powered aircraft engine cowling systems. It highlights the risks of fastener misinstallation and damage, emphasizing the need for thorough pre-flight and post-maintenance inspections to prevent cowl separation events. The FAA does not consider this an unsafe condition warranting an airworthiness directive at this time.

Why it matters

Proper maintenance and inspection of quarter-turn fasteners are critical to ensuring the structural integrity of engine cowling systems, which directly impacts flight safety and aircraft handling. Operators and maintenance organizations must be vigilant to avoid fastener-related damage that can lead to costly repairs or potential loss of control. Understanding these risks helps compliance teams and MROs implement effective inspection protocols and repair practices.