Forward ejection seat

Figure 5-1.-Forward ejection seat; (A) right-hand view, (B) left-hand view—Continued. zero speed, zero altitude in a substantially level attitude to a maximum speed of 600 knots estimated air speed (KEAS) between zero altitude and 50,000 feet. Ejection is initiated by pulling a seat firing handle situated on the front of the seat bucket between the occupant’s thighs. The parachute container is fitted with canopy breakers to enable the seat to eject through the canopy should the jettison system fail. After ejection, drogue deployment, man/seat separation, and parachute deployment are automatically controlled by an onboard multimode electronic sequencer. A barostatic harness release unit caters for partial or total failure of the electronic sequencer, and an emergency restraint release (manual override) system provides a further backup in failure of the barostatic release. the event of The seat is ejected by action of the gas pressure developed within a telescopic catapult when the cartridges are ignited. An underseat rocket motor situated under the seat bucket is fired as the catapult reaches the end of its stroke, and sustains the thrust of the catapult to carry the seat to a height sufficient to enable the parachute to deploy even though ejection is initiated at zero speed, zero altitude in a substantially level attitude. The seat is stabilized and the forward speed retarded by a drogue and bridle system, followed by automatic deployment of the personnel parachute and separation of the occupant from the seat. Timing of all events after rocket motor initiation is 5-3