Drogue to seat separation assembly having pyrotechnic fastener

An ejection seat, comprising:

• a seatback;
• a drogue canopy stowed, at least partially, in an interior of the seatback;
• a bridle riser coupled to the drogue canopy and the seatback;
• a housing coupled to the seatback and defining a riser channel and a fastener opening
• a pyrotechnic fastener configured to extend through the fastener opening and the riser channel, the pyrotechnic fastener including a charge configured to undergo an exothermic reaction in response to an electrical signal, wherein the pyrotechnic fastener includes a fastener body, wherein the fastener body defines a chamber configured to receive gas produced by the exothermic reaction, wherein the pyrotechnic fastener is configured to sever in a first region of the fastener body and in a second region of the fastener body in response to the exothermic reaction;
• and
• a bushing located in a loop formed by an end of the bridle riser, wherein the bushing is configured to be received in the riser channel, wherein the bushing defines a fastener channel configured to receive the pyrotechnic fastener, wherein the first region corresponds to a first end of the bushing, wherein the second region corresponds to a second end of the bushing, and wherein a first length of a central portion of the fastener body is approximately equal to a second length of the bushing, the first length of the central portion of the fastener body measured between the first region and the second region, the second length of the bushing measured between a first end of the bushing and a second end of the bushing.

A method for installing a drogue parachute in an ejection seat, comprising:

• locating a bushing coupled to an end of a drogue bridle riser in a riser channel defined by a housing, the housing coupled to a seatback of the ejection seat;
• locating a pyrotechnic fastener through the bushing and the housing;
• electrically connecting the pyrotechnic fastener to a sequencer of the ejection seat;
• and
• configuring a fastener body of the pyrotechnic fastener to sever in a first region and in a second region, wherein a first length of the fastener body between the first region and the second region is approximately equal to a second length of the bushing, the second length of the bushing measured between a first end of the bushing and a second end of the bushing.