ARRESTING GEAR - 14014

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The landing gear system (fig. 4-13) consists of three retractable landing gear assemblies. Each main landing gear has a conventional air-oil shock strut, a wheel brake assembly, and a wheel and tire assembly. The nose landing gear has a conventional air-oil shock strut, a shimmy damper, and a wheel and tire assembly. The shock strut is designed to absorb the shock that would otherwise be transmitted to the airframe during landing, taxiing, and takeoff. The air-oil strut is used on all naval aircraft. This type of strut has two telescoping cylinders filled with hydraulic fluid and compressed air or nitrogen. Figure 4-14 shows the internal construction of one type of air-oil shock strut. The main landing gear is equipped with brakes for stopping the aircraft and assisting the pilot in steering the aircraft on the ground. The nose gear of most aircraft can be steered from the cockpit. This provides greater ease and safety on the runway when landing and taking off and on the taxiway in taxiing. ARRESTING GEAR A carrier-type aircraft is equipped with an arresting hook for stopping the aircraft when it lands on the carrier. The arresting gear has an extendible hook and the mechanical, hydraulic, and pneumatic equipment necessary for hook operation. See figure 4-15. The arresting hook on most aircraft releases mechanically, lowers pneumatically, and raises hydraulically. The hook hinges from the structure under the rear of the aircraft. A snubber meters hydraulic fluid and works in conjunction with nitrogen pressure. The 4-12 ACTUATING CYLINDER DOWNLOCK CYLINDER FROM COMBINED SYSTEM LANDING GEAR SELECTOR VALVE DOOR AND DOORLATCH CYLINDERS UPLOCK CYLINDER DOOR CYLINDER DOWNLOCK CYLINDER RETRACTING CYLINDER MAIN GEAR TO LEFT MAIN GEAR NOSE GEAR NOTE TIMER VALVES ARE USED IN MAIN GEAR SYSTEM TO CONTROL PROPER SEQUENCE. Anf0413 Figure 4-13.—Typical landing gear system. ANf0414 TOWING EYE TORQUE ARMS METERING PIN INNER CYLINDER (PISTON) AIR VALVE WHEEL AXLE ORIFICE PLATE ORIFICE OUTER CYLINDER Figure 4-14.—Internal construction of a shock strut.

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