Manifold Check Valve

The manifold check valve (24) (figs. 6-20 and 6-21) provides an interface between the ejection seat and the catapult. The manifold check valve is mounted to the top of the catapult. The valve is held against the primary firing mechanism by a spring-loaded plunger and a retaining pin. The valve contains two inlet ports, which connect the hoses from the 0.30-and 0.30/ 0.75-second delay initiators. Internal check valves ensure that 400 to 600 psi gas pressure is maintained at the catapult primary firing mechanism.

Main Beam Assembly 

The main beam assembly (6) (fig. 6-20) is the main structure of the ejection seat. The main beam assembly consists of left and right vertical beams bridged by three cross members. The assembly supports the major components of the ejection seat. Three slippers are bolted to the in-board side of each beam to engage the guide rails on the catapult outer barrel. The upper cross member is used to hold and correctly position the top of the catapult. This member withstands the full thrust of the catapult during the ejection sequence. The bolts that attach the upper cross member to the main beam assembly also attach the top latch mechanism to the left beam. The inertia reel (12) and the upper attachment for the seat height actuator are mounted to the center cross member. Two tabular tubes are secured to the center and lower cross members. The tubes have two sliding runners that attach to the seat

Figure 6-21.- Scissor mechanism and manifold check valve

bucket. The seat height actuator rod is attached upper cross member. It retains the drogue to the lower sliding runner. The components parachutes after they are deployed and prevents attached to the main beam assembly are discussed deployment of the personnel parachute until a safe in the following paragraphs. altitude and g-force is reached. The scissor mechanism has a moveable jaw, which is held in

TOP LATCH MECHANISM.- The main the closed position by the shackle plunger of the beam assembly is secured to the catapult by the top latch mechanism, which is located on the upper end of the left beam. The mechanism consists of a housing with a spring-loaded plunger. The inboard end of the plunger is shaped to engage the catapult inner barrel. The outboard end is threaded to accept the top latch handwheel. When the handwheel is installed, it permits removal of the ejection seat from the catapult.

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