The electrical control system of the cargo doors controls the door hydraulic system as follows:
The proximity switch 5MJ (12MJ) sends a signal to tell the Landing Gear Control and Interface Unit 5GA2 (LGCIU) if the cargo door is released. The series-connected limit switches 2507MJ and 2508MJ (2509MJ), installed with the semi-automatic cargo loading system, also send signals to the LGCIU. These signals make sure that the different latches of each door sill latch 2004VU are in the correct positions. If the manual selector valve 2501MJ (2504MJ) is operated, its internal proximity switch also sends a signal to the LGCIU. The logic of the LGCIU processes these signals and produces an output signal to operate the L/G position relay 12GB. When the aircraft is on the ground, the L/Gposition relay transmits the LGCIU output signal to the time relay 6MJ. The time relay 6MJ then energizes the solenoid of the electro-manual selector valve 2500MJ. The time relay 6MJ also eneregizes the electric pump 3075GX of the yellow hydraulic system which pressurizes the door hydraulic system.
The circuitry of the relays 10MJ, 11MJ, 13MJ and 14MJ controls the logic between the hydraulic operation of the FWD cargo door and the electrical door control system of the AFT cargo door or vice-versa.
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Schematic of Electrical Door Control System R Figure 004
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Schematic of Electrical Door Control System R Figure 004A (SHEET 1)
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Schematic of Electrical Door Control System R Figure 004A (SHEET 2)
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Schematic of Electrical Door Control System R Figure 004A (SHEET 3)
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Schematic of Electrical Door Control System R Figure 004B (SHEET 1)
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Schematic of Electrical Door Control System R Figure 004B (SHEET 2)
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Schematic of Electrical Door Control System R Figure 004C (SHEET 1)
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Schematic of Electrical Door Control System R Figure 004C (SHEET 2)
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Schematic of Electrical Door Control System R Figure 004C (SHEET 3)
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Schematic of Electrical Door Control System R Figure 004D (SHEET 1)
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Schematic of Electrical Door Control System R Figure 004D (SHEET 2)
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R 1EFF : 401-499, 1 52-35-00Page 30 1 1 Aug 01/05 1 1 1CES 1 When this door control circuit is interrupted, the electro-manual selector valve 2500MJ and the electric pump 3075GX remain energized for 10 sec. more.
When the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are locked internally, their internal proximity switches send a signal to the green indicator light 9MJ (8MJ) which comes on.
**ON A/C 051-099, 151-199, 201-210,
NOTE : The component identifications in brackets are for the electrical
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control system components of the AFT cargo door.
The electrical control system of the cargo doors controls the door hydraulic system as follows: The proximity switch 5MJ (12MJ) sends a signal to tell the Landing Gear Control and Interface Unit 5GA2 (LGCIU) if the cargo door is released. If the manual selector valve 2501MJ (2504MJ) is operated, its internal proximity switch also sends a signal to the LGCIU. The logic of the LGCIU processes these signals and produces an output signal to operate the L/G position relay 12GB. When the aircraft is on the ground, the L/G position relay transmits the LGCIU output signal to the time relay 6MJ. The time relay 6MJ then energizes the solenoid of the electro-manual selector valve 2500MJ . The time relay 6MJ also energizes the electric pump 3075GX of the yellow hydraulic system which pressurizes the door hydraulic system. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM DOORS 舱门6(84)
