This is concerning items produced by Ameri-King Corp. Parts Manufacturer Approval (PMA) articles: Emergency Locator Transmitter Equipment: AK-450 Series, AK-451 Series

Air Safety Information Letter A19A0062-D1-L1 Aileron Control System Geometry/Rod End Bearings
Prohibiting the use of hook-and-loop fasteners, (Velcro) Emergency locator transmitter
and Fire Extinguisher
Requirements for Emergency Locator Transmitters (ELT), 406 MHz.
Advisory Circular 549-001: Amateur-built Aircraft Fuel Systems