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LUBRICATION SYSTEM - 14001_152
STEAM SYSTEM

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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Figure 4-16.-Clinder elongation indicator installation and upper and lower cover support bars (see fig. 4-17). The trough is of welded construction, made of steel plates, and is reinforced on the outside. The troughs are built with voids outside the trough walls. The bolted down access plates for these voids form the flight deck at both sides of the bow catapults. The access to the voids on waist catapults is from below deck through the sides of the voids. The trough contains heaters used to preheat the catapult and to maintain minimum catapult operating temperature during all weather conditions. The launching engine cylinders rest on lubricated bearing pads mounted in the trough. The only points at which the launching engine is secured to the ship structure are at the thrust unit at the aft end of the launching engine and at the forward or buttress plate end of the water-brake cylinders. The forwardmost launching engine cylinders telescope over the water-brake cylinders. This allows longitudinal expansion and contraction during catapult heating and cooling. Catapult Trough Covers The trough covers perform a dual function. They cover the catapult trough which accommodates the launching cylinders, and they form a shuttle track, which supports and guides the shuttle and grab during catapult operation (fig. 4-17). All covers are designed to withstand a vertical rolling shuttle load of 264,000 pounds total (132,000 pounds to each cover) in upward directional force and 100,000 pounds wheel-load in downward directional force. The standard trough covers are made in various lengths: the 6-foot-long intermediate and aft covers, the 4-foot forward cover 4-15







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