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6 - Main landing gear ground safety microswitch 7 - Main landing gear compensating spring 8 - Main landing gear hinged strut microswitch 9 - Main landing gear hinged strut 10 - Nose landing gear compensating actuator 11 - Nose landing gear hinged strut microswitch 12 - Nose landing gear hinged strut 13 - Nose landing gear actuating cylinder Extension and retraction Key to Figure 1 ® Extension and retraction Figure 1 C. Main landing gear compensating spring The helical compensating spring provides hinged strut locking when the main landing gear reaches the low position in the "EMERGENCY" extension. It is pulled on the end of the hinged strut at the landing gear side. It is attached to the end of the hinged strut and to a landing gear fitting above its hinge. 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. 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(39) |
