0.9 inch (approximately), the shoulder on the lock strikes the immobilized unlock sleeve and stops. This action releases the upper tangs of the lock and unseals the rocket motor nozzle by severing the nozzle plug and retaining the motor lock disk. The hot, pressurized gases from the cartridge then pass into the rocket motor assembly through the nozzle. These gases energize the rocket motor firing mechanism, which ignites the rocket igni- tion material. The rocket ignition material and/or the hot gases from the booster cartridge ignite the rocket motor solid-propellant grain. The rocket motor then provides additional thrust to the air- crewman seat after separation of the booster and rocket sections. The rocket motor internal pressure energizes two output cartridge firing mechanisms that fire the output cartridge. The output cartridge then actuates other escape devices, which are attached to the output fitting. INSPECTION OF THE ROCKET CAT- APULT.— The rocket catapult must be inspected whenever it is removed from the shipping container for use and prior to returning it to stowage. If the rocket catapult is found in a hazardous condition, explosive ordinance disposal (EOD) personnel must be immediately notified. After the rocket catapult is rendered safe, or if it is rejected for any other reason, it must be disposed of in accordance with NAVAIR 11-85-1. Inspect the rocket catapult for damage, such as dents and corrosion; reject the unit if it has any visible defects. Inspect the head end cap for tightness by grasping the cross-shaped head end trunnion (word AFT stamped on face) with one hand and attempt to tighten the head end cap with the other. If any cap motion is detected, do not reject the unit but repair it in the following manner. Back off head end cap until the U-shaped slot in the rocket motor tube is exposed. Inspect to see if the head end trunnion pin is completely contained within the U-shaped slot. If the entire pin is not visible within the slot, reject the unit. NOTE: Pin is not necessarily bottomed in the slot. If unit passes inspection, apply Locktite (grade N) to exposed thread area, hand tighten cap, and then tighten with strap wrench. Inspect the adjustment ring for tightness by grasping the cross-shaped head end trunnion (word AFT stamped on face) with one hand and attempt to tighten the adjustment ring with the other. If more than a few degrees of side-to-side play is evident in adjustment rings with six holes (two con- figurations of adjustment rings are in service— one with six holes and one without holes), reject the unit. If the adjustment ring without holes is found to be loose, do not reject the unit but repair it in the following manner. Back off the adjustment ring until it contacts the head end cap, and apply Locktite sealant (grade N) to the exposed, degreased thread area. Ensure that the front body housing is tightened down against the catapult tube prior to hand tightening the adjustment ring against the front body housing. Allow Loctite sealant to set. Reinspect prior to use. MARTIN-BAKER SJU-5/A EJECTION SEAT Learning Objective: Recognize the com- ponents, seat system/subsystems, support components, system operations, compo- nent test and test equipment, and corrosion control procedures for the Martin-Baker SJU-5/A ejection seat. The SJU-5/A ejection seat is a ballistic catapult and rocket system that gives the pilot a quick and safe means of escape from an aircraft. The seat system includes an initiation system that jettisons the canopy, positions the pilot for ejection, and fires the seat catapult. Canopy breakers on the top of the seat allow the seat capability to eject through the canopy should it fail to jettison. As the seat ejects from the aircraft, a rocket motor on the bottom of the seat is fired. Then a drogue gun is fired to deploy two drogue parachutes. These parachutes either remain attached to the top of the seat or they are released to deploy the main parachute, depending upon the altitude and the number of g’s applied to the seat. An automatic time-release mechanism opens the main parachute container and releases the drogue parachutes that deploy the main parachute. 6-25