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DROGUE CHUTE AND CONTAINER PROJECTION.- When the outer catapult tubes have moved upward approximately 16 inches on the inner tubes, gas pressure is applied to the pistons attached to the drogue container. There is one piston in each outer tube. When the pistons exit the top of the outer catapult tubes, the drogue container and parachute move up and aft of the seat. Then, aerodynamic pressure is applied to the container. This causes stretching of the drogue bridle and loosening of the drogue container flaps. The drogue suspension lines and canopy then emerge while the container and associated hard-ware are jettisoned (fig. 6-42). TROMBONE ASSEMBLIES.- Two pairs of trombone assemblies are associated with the catapult. The outer trombone assemblies route ballistic gas from two M99 ejection initiators to the catapult cartridge igniters. The inner trombone assemblies route ballistic gas pressure from the catapult tube assemblies to components of the post-ejection sequencing sub-systems and to both seat-back rockets (SBR). They also route ballistic gas pressure from the 7,000-and 14,000-foot aneroid-actuated initiators to the parachute container opener (fig. 6-40). Sustainer Thrust Subsystem During either mode 1 or mode 2 operation, two SBR motors provide the thrust necessary to propel the seat and pilot to an altitude sufficient to attain terrain and aircraft tail clearance and to allow personnel parachute deployment and infla-tion. Each SBR has dual-ignition inlet ports. Ballistic gas pressure from both catapult tube assemblies is ported into both SBRs to provide redundant ignition. This pressure fires internal SBR igniters, which ignite the propellant grain for a burn time of approximately 0.25 second (fig. 6-40).
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