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Steam Catapult Log sheet
FIRING CATAPULT (FIRST LAUNCHING)

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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when filling each space on the log sheet. See figure 4-83 for a Steam Catapult Log sheet. Log sheets are available in pad form, 100 sheets per pad, and may be requisitioned according to section II of NAVSUP Publication 2002 for steam catapults. Not more than a 1-year supply should be stocked. Filled-in log sheets must be retained in chronological order for a period of at least 1 year. Automated Shot and Recovery Logs Program An automated program has been developed to record the Shot Log, Recovery Log, and the Wire Rope History Report on computer disc. These discs would then be sent to NAWC Lakehurst vice the stacks of paper forms currently in use. The program will be promulgated to all CVS upon completion of prototype testing. Retraction-Engine Operation The linear and rotary retraction engine components and operations were discussed previously in this chapter; therefore, they will not be discussed again. For detailed information concerning catapult retraction-engine systems, consult the catapult operations instructions for the type of catapult on your ship. Dynamometer A dynamometer is an apparatus for measuring force or energy. It commonly embodies a spring to be compressed, and an index (scale) to show the amount of tension obtained. Figure 4-84 illustrates a common type of dynamometer. For the ABEs, the most common use of the dynamometer is made by the catapult crew. Part of the daily checklist on all catapults is a check of the bridle tensioning force that the bridle tensioning system is supplying. This check is made by anchoring one end of a dynamometer to the deck, aft of the catapult, with a cable and securing the other end of the dynamometer to the catapult shuttle with a cable. The bridle tension system is then activated, and the amount of horizontal force it is putting out is read on the scale of the dynamometer. It must be within the limits specified in the applicable maintenance manual or Service Bulletin for the type of catapult concerned. Figure 4-84.—Dynamometer tensioner check. Launching Operations Catapult launching operations must be according to instructions contained in appendix A and section IV of the CV NATOPS MANUAL. Aircraft may be launched under emergency conditions, when required minimum cylinder elongation is not attainable, by increasing the wind-over-deck requirements as specified in the applicable Aircraft Launching Bulletins. After performing the no-load test launching procedures, prepare the catapult for normal launching operations as follows: 1. Complete the preoperational inspection list for each station according to applicable MRCs. 2. Turn on the interlock between adjacent catapults. 3. Check for proper operation of the positive lock grab. 4. Ensure that the gauge for the fluid regulator valve to the solenoid-operated bridle tensioning valves reads the required pressure. 5. Bring the steam pressure in the steam receivers up to normal launching requirements, as applicable for a particular type of aircraft. 4-67







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