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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 load check valve to the emergency valve, which drives it towards the actuator upper chamber (down). The end of travel microswitches are actuated and the red warning light comes on. The landing gear reaches its down position, the hinged struts are locked, the microswitches are actuated, the red warning light goes off and the green indicator lights come on. I ACAC Validity : Electrohydraulic generator "COMMERCIAL HYDRAULICS" 32 30-00Page 5 (CA) JUN 02 1 - Nose gear actuator 2 - R.H. main gear actuator 3 - Pressure switch 4 - Thermal valve 5 - Check valve 6 - Pump 7 - High pressure valve 8 - Check valve 9 - Filter 10 - Reservoir 11 - Check valve 12 - Low pressure valve 13 - Check valve 14 - L.H. main gear actuator 15 - Emergency valve control 16 - Configuration and control panel 17 - Emergency valve Landing gear system during retraction Key to Figure 2 ACAC Validity : Electrohydraulic generator "COMMERCIAL HYDRAULICS" 32-30-00Page 6 (CA) JUN 02 Landing gear system during retraction Figure 2 I ACAC Validity : Electrohydraulic generator "COMMERCIAL HYDRAULICS" 32-30 00Page 7 (CA) JUN 02 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(47) |
