cartridge, and a shackle plunger assembly. The shackle plunger is secured in the scissor shackle plunger housing to lock the scissor mechanism in the closed position, as shown in figure 6-21. In this position, the drogue shackle is secured to the ejection seat. Gas lines connect the TRM to the manual override initiator and to the secondarys cartridge of the drogue gun. A piston located on top of the upper body engages the parachute mechanical lock to secure the personnel para- chute. The TRM 1.5-second time-delay mechanism delays seat/man separation and deployment of the personnel parachute until the drogue parachutes stabilize and decelerate the ejection seat. The barostat assembly delays the deployment of the personnel parachute until the pilot and the ejection seat descend to 14,500 feet. This delay prevents prolonged descent in the upper atmosphere. When ejection occurs above 7,500 feet, a barostat g-controller delays the deployment of the personnel parachute until deceleration loads are less than 3 g’s. DROGUE GUN.— The drogue gun (1) (fig. 6-20) (also shown in fig. 6-26) is mounted on the outboard side of the left beam. The drogue gun deploys the drogue parachutes during the ejection sequence. The drogue gun incorporates a 0.5-second delay to ensure that the ejection seat has cleared the cockpit prior to deploying the drogue parachutes. The gun consists of a body and a barrel assembly. The drogue gun body contains a time-delay mechanism, a spring-loaded firing pin, and two cartridges (primary and secondary). The barrel assembly contains a piston that is held in place by a shear pin. The barrel holds the primary cartridge and water seal. The primary cartridge is mechanically fired by a trip rod attached to the cockpit bulkhead. A chamber connected by a gas passage to the barrel holds the secondary cartridge and a gas- operated firing mechanism. This chamber ensures that actuation of either cartridge will fire the piston from the barrel. INERTIA REEL ASSEMBLY.— The inertia reel (12) (fig. 6-20) is mounted on the center cross member of the main beam assembly. During normal operation in the UNLOCK position, the inertia reel is free to extend or retract as required by the pilot’s movements, but an automatic lock feature will prevent rapid forward movement. When the rapid movement ceases, the inertia reel returns to normal operation. When the inertia reel is in the LOCKED position, it will retract the straps but will not allow them to extend. When the ejection sequence is initiated, a pyrotechnic cartridge is used to activate the inertia reel. This retracts and locks the pilot into the correct position for ejection. ROCKET MOTOR INITIATOR.— The rocket motor initiator (4) (fig. 6-20) is mounted on the outboard side of the left beam. The rocket motor initiator consists of a cartridge chamber, a firing mechanism, and a coiled static line. The chamber is attached to the trombone fittings (9) by an outlet connector. The static line is coiled into a plastic container. The upper end of the line is attached to the quadrant lever and the lower. end is attached to the drogue gun trip rod. SEAT HEIGHT ACTUATOR.— The seat height actuator is mounted in the main beam assembly forward of the catapult gun. The actuator permits adjustment of the seat bucket within a vertical travel of approximately 5 inches. The seat height actuator consists of an electric motor and housing, gearbox, bearing housing, and jackscrew assembly. AIRCRAFT SEAT PARACHUTE.— The aircraft seat parachute container (13) (fig. 6-20) is located near the top of the main beam assembly. The parachute consists of a 22-inch controller drogue, a 5-foot stabilizing main drogue, and a 17-foot personnel parachute. The controller drogue deploys the -stabilizing drogue that decelerates and stabilizes the ejection seat during the initial phase of the ejection sequence. The personnel parachute provides the pilot with a safe means of descent. The parachute container provides support for the pilot’s head during for- ward acceleration or wind blast. The personnel parachute is packed in the container first. It is secured by flaps and a closure pin that is attached to the personnel parachute withdrawal line. The withdrawal line attaches the main drogue to the apex of the personnel parachute. Then the main and controller drogues are packed. They are secured by four flaps and a closure pin, which is attached to the drogue withdrawal line. The drogue shackle secures the parachute withdrawal line and extender strap. Then the drogue shackle is secured in the scissor mechanism. 6-32