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D. Nose landing gear compensating actuator The gas strut compensating actutators provide the nose landing gear extension in "EMERGENCY". They are attached to the compensating lever at the rear attachment level of the hinged strut and to the hinge tab of the nose landing gear hinged body. E. End of travel microswitches The end of travel microswitches transmit the landing gear position to the pilot through the configuration and control box. With vapor cycle cooling system S183 microswitch (landing gear locked down), located on the hinged strut of R.H. main landing gear is also used to shed vapor cycle cooling system when max. power / landing gears locked down condition is reached. 4. OPERATION (Figures 2, 3, 4, 5 and 6) A. Landing gear retraction When the pilot actuates the control lever of the landing gear configuration and control box in the "UP" position, it supplies the electrohydraulic generator electrically. The latter supplies pressurized hydraulic fluid to the actuating cylinders. Under the action of the actuators, the hinged struts are unlocked, their microswitches are actuated, the green indicator lights go off and the red warning light comes on. The landing gears go up, pulled by the actuators, in their respective housing. When they are at the up landing gear end of travel, the pressure in the system actuates the pressure switch which cuts off the electrical power supply of the electrohydraulic generator, and the landing gears actuate the end of travel microswitches which cause the red warning light to go off. In up position, landing gears are not locked, but they are maintained by the hydraulic pressure held in the actuators by a check valve located on the electrohydraulic generator. B. Landing gear extension in "NORMAL" When the pilot actuates the control lever of the landing gear configuration and control box in the "DOWN" position, it supplies the electrohydraulic generator electrically. The latter supplies pressurized hydraulic fluid to the landing gear actuating cylinders. The landing gear starts to go down, the pressure exerted by the landing gears on the end of travel microswitches is loosened and the red warning light comes on. The landing gear reaches its low position, the hinged struts lock, the microswitches are actuated, the electrohydraulic generator stops, the red warning light goes off and the green indicator lights come on. The landing gear is locked down. C. Landing gear extension in "EMERGENCY" When the electric pump circuit-breaker is disconnected and, when the pilot actuates the landing gear emergency control pull knob, the emergency valve is in open position. The "UP" and "DOWN" chambers of the landing gear maneuver actuators intercommunicate through the emergency valve. The pressure falls, the landing gears go down by gravity thanks to the compensating actuators (nose landing gear) and the compensating springs (main landing gears) which actuate the hinged struts. The hydraulic fluid is expeled from the actuator low chamber (up) towards the electrohydraulic generator. It is displaced by the generator check valve to the emergency valve, which drives it towards the actuator upper chamber (down). The additional fluid, provided by hydraulic fluid from the electrohydraulic generator, goes behind the shuttle valve. 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 32 起落架 TB20飞机维护手册(43) |
