AS707D Thermal Sensitive Inflation Pressure Release Devices for Tubeless Aircraft Wheels

The focus of this SAE Aerospace Standard (AS) is the integration of thermally actuated pressure release devices, hereafter referred to as fuse plugs, with the wheel and brake assembly. It does not address the manufacturing, quality, or acceptance test requirements pertaining to the production of these fuse plugs. It establishes minimum design, installation, qualification, and operational requirements for fuse plugs which are used only in tubeless tire-type aircraft braked wheels. Fuse plugs are designed to completely release the contained inflation pressure from a tubeless tire and wheel assembly when brake generated heat causes the tire or wheel to exceed a safe temperature level. The objective is to prevent tire or wheel rupture due to brake generated heat that could cause an unsafe condition for personnel or the aircraft. Refer to FAA Advisory Circular (AC) No. 23-17C; 14 CFR Part 25.735 (j); FAA AC No. 25.735-1; FAA AC No. 25-7D; EASA Certification Specifications for Large Aeroplanes (CS-25) 25.735 (j); and AMC 25.735.