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Figure 2-23.-Loosening cartridge
Figure 2-26.-Cartridge markings-head and side

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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Figure 22-24.—Sliding on to test fixture. so that the shaft butts against the bottom of the cartridge chamber (fig. 2-24). 9. Open the four snap fasteners on the spreading gun extractor sleeve to expose the firing pin housing. Slide the block assembly at the center of the test fixture under the firing pin housing until the block assembly pin slides into the baseplate hole. Align the firing pin so that the hole in the firing pin is horizontal. The firing lanyard is located at the top. (See figure 2-25.) Figure 2-25.—Spreading gun installation. 10. Attach the hook assembly to the firing pin hole, and slide the hook assembly block over the nut that is attached to the pull gage. (See figure 2-21). 11. Move the switch on the pull gage to the center position. You must zero your meter needle by rotating the bezel on the dial. Move the switch to the full down position, away from the meter, for recording the pull force. 12. The QA verifies the test fixture lever firing pin releases. The pull force must go between 25 and 38 pounds. If a gun has failed the first test, it must be retested two more times. The gun must pass both retests. Record the force required to release the firing pin on the Parachute Configuration, Inspection, and History Record. When a gun fails, it is removed and returned to supply as a defective item. 13. After the pull-force measurement has been obtained, remove the hook assembly from the firing gun. 14. Push the firing pin back into the housing. Push the control disc firmly inward, forcing the firing pin out of the housing. Apply inward hand pressure to the firing pin as it moves out. Continue to move the control disc inward, applying hand pressure to the firing pin until it clicks into place. When a click is heard, the gun is cocked. Gently release the control disc while still exerting pressure on the pin. 15. The QA inspector must tug gently on the firing pin until the effect of spring loading is felt. If the pin moves without spring tension, the gun is not cocked, and step 14 must be repeated. 16. Release the block assembly by pulling the pin out of the hole in the baseplate and sliding the block away from the spreading gun. Remove the gun from the shaft. Do not remove the gun by pulling on the firing lanyard. 17. At this time, install the safety pin. CAUTION WHEN YOU ARE USING ALCOHOL TO CLEAN THE CARTRIDGE CHAM- BER, DO NOT ALLOW ALCOHOL TO FLOW INSIDE THE GUN BECAUSE THIS COULD DAMAGE THE O-RINGS AND LUBRICATION. 2-14







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