Drogue to seat separation assembly having pyrotechnic fastener

A drogue bridle separation assembly 140b comprising a housing 142 defining a riser channel 144 and fastener opening 164, a pyrotechnic fastener 162 extending through the opening and channel, detonating in response to an electric signal. Also, an ejection seat stowing a drogue canopy in the seatback 102 interior, a bridle riser coupled to the drogue canopy, and a bushing 148 in the end of the bridle riser with a pyrotechnic fastener in the bushing. Also a method of installing a drogue parachute in an ejection seat comprising locating a bushing coupled to a drogue bridle riser in a channel defined by a housing coupled to the seatback, and locating a pyrotechnic fastener through the bushing, and electrically connecting the fastener to a sequencer 150 of the ejection seat. The body 176 of the fastener may comprise different materials of different densities, and may define a chamber to receive gas produced by the pyrotechnic and sever in a region in response. .