US Patent 10343790 Burst disc device and aircraft

An insulative ring protects a burst disc of an aircraft from the shock of lightning strikes. The burst disc device includes: a burst disc which is installed inside a main wing to prevent over-pressurization of the main wing; a pressure release passage partially constituted by a support tube and is blocked with the burst disc and leads to the outside of the main wing; an insulative ring which is disposed along the inner peripheral edge at a terminal end of the pressure release passage and exposed to the outside of the main wing, and an insulation layer which is disposed between a flange of the support tube and an inner surface of a panel of the main wing.