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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. 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. 1 - Nose gear actuator 2 - R.H. main gear actuator 3 - Pressure switch 4 - Reservoir 5 - High pressure valve 6 - Protection valve 7 - Check valve 8 - Shuttle valve 9 - Spool valve 10 - Pump 11 - Low pressure valve 12 - Air intake 13 - Filter 14 - Motor shaft 15 - L.H. main gear actuator 16 - Emergency valve control 17 - Configuration and control panel 18 - Emergency valve Extension and retraction - Landing gear system during retraction Key to Figure 2 I AAAA Validity Electrohydraulic generator Page 6 "PRESTOLITE" 32-30-00 (AM) JUN 02 Extension and retraction - Landing gear system during retraction Figure 2 1 - Nose gear actuator 2 - R.H. main gear actuator 3 - Pressure switch 4 - Reservoir 5 - High pressure valve 6 - Protection valve 7 - Check valve 8 - Shuttle valve 9 - Spool valve 10 - Pump 11 - Low pressure valve 12 - Air intake 13 - Filter 14 - Motor shaft 15 - L.H. main gear actuator 16 - Emergency valve control 17 - Configuration and control panel 18 - Emergency valve Extension and retraction - Landing gear system in "retracted" position Key to Figure 3 Extension and retraction - Landing gear system in "retracted" position Figure 3 I AAAA Validity : Electrohydraulic generator "PRESTOLITE" 32-30-00 (AM)Page 9 JUN 02 1 - Nose gear actuator 2 - R.H. main gear actuator 3 - Pressure switch 4 - Reservoir 5 - High pressure 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(40) |
