Cushioning Piston

Cable anchor damper fluid flow (arrestment)

SHEAVE DAMPER

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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prevents a hard impact between the two as the pistons bottom against the flanges. Cushioning Piston The sole function of the cushioning piston is to prevent the operating piston from slamming into the opposite end of the cable anchor damper assembly if the purchase cable should break or in the event of an extreme off-center landing. In either situation, the operating piston accelerates away from its BATTERY position and rams the cushioning piston. Battery Positioner The battery positioner (fig. 3-19) functions to return the cable anchor damper piston to its BATTERY position during the retracting cycle of the arresting engine. The battery positioner includes a three-way air valve (3), which is connected to a 100-psi air supply and to the air container mounted on the cushioning end of each damper assembly. An air strainer (4) is located in the supply line ahead of the three-way valve. The three-way air valve is mounted on a base plate (5), secured to the arresting engine retracting valve, and operated by means of a cam (1) mounted on the retracting valve actuating lever. When the actuating lever is moved to its retract position, the cam positions the three-way air valve to admit 100-psi air to the air containers. From the air container, the 100-psi air passes through a hole in the cushioning piston rod and acts against the operating piston, moving it to its fully retracted position. As soon as the actuating lever is released, the air pressure is shut off, and the air container is vented through an exhaust line (2) at the three-way air valve. A line containing a liquid sight indicator (7) and a drain plug (6) is provided at each container. The fluid sight indicator permits detection of fluid leakage into the air container. Figure 3-19.—Battery positioner. 3-23

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