Cable anchor damper fluid flow (arrestment)

Automatic lubrication systcm

Cushioning Piston - 14001_93

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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cable anchor damper assembly, and the indicator lights are located on the arresting engine control panel. The end of the purchase cable is attached to the operating piston rod, which is attached to the operating piston. When the force on the operating piston, due to engine cylinder pressure, is greater than the tensile force in the purchase cable, the piston moves away from its BATTTERY position. Movement of the operating piston into the cylinder removes the cable slack during the first portion of the arrestment. When the slack is taken up, the operating piston resists the return of the cable, thus keeping it taut and preventing excessive cable vibration. Upon engagement of the deck pendant by the aircraft, the engine crosshead is accelerated toward the fixed sheaves. This movement forces the ram into the arresting engine cylinder, increasing the fluid pressure in both the engine cylinder and the operating head of each cable anchor damper. See figure 3-18. Because of the acceleration rate of the engine crosshead, the tension in the purchase cable (2) between the engine sheaves and the cable anchor dampers decreases momentarily. The instant the tensile force in the cable becomes less than the force on the operating piston (4), fluid pressure moves the operating piston away from its BATTERY position until all slack is removed and the cable tension is again greater than the fluid pressure force acting on the operating piston. The flow control valve is a clapper-type check valve that allows free flow of the fluid one way and a restricted flow in the opposite direction. The engine fluid has free flow through the flow control valve (1) to the operating end of each cable anchor damper. When the tension of the purchase cable is transmitted to the cable anchor ends, the fluid pressure on the operating pistons is overcome by this cable tension, and the operating pistons are pulled back toward BATTERY position. Resistance to their return is furnished by the engine fluid pressure and the controlled flow of fluid through the flow control valves back to the engine cylinder. A 2-inch buffer stroke between the operating pistons and flanges Figure 3-18—Cable anchor damper fluid flow (arrestment). 3-22

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