DOC AIRBUS | AMM A320FCARGO COMPARTMENT DOOR ELECTRICAL CONTROL SYSTEM - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The electrical control system of the FWD and AFT cargo-compartment doors (referred to as cargo doors) controls the sequence of the hydraulic operation. It is possible to open or close the FWD and the AFT cargo doors hydraulically at the same time. Each cargo door has a circuit that operates independently.
** ON A/C NOT FOR ALL The electrical control system of the FWD and AFT cargo-compartment doors (referred to as cargo doors) controls the sequence of the hydraulic operation. It is possible to open or close the FWD and the AFT cargo doors hydraulically at the same time. Each cargo door has a circuit that operates independently.
2. Component Location
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| FIN ! FUNCTIONAL DESIGNATION ! PANEL!ZONE!ACCESS ! ATA |
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| 2500MJ ELECTRO-MANUAL SELECTOR VALVE 2006VU 198 198CB 52-36-12 |
| 2501MJ MANUAL SELECTOR VALVE 134 134AR 52-36-15 |
| 2502MJ DOOR ACTUATOR 132 825 52-36-18 |
| 2503MJ DOOR ACTUATOR 132 825 52-36-18 |
| 2504MJ MANUAL SELECTOR VALVE 154 154AR 52-36-15 |
| 2505MJ DOOR ACTUATOR 152 826 52-36-18 |
| 2506MJ DOOR ACTUATOR 152 826 52-36-18 |
| 15MJ RELAY 103VU 126 822 |
| 14MJ RELAY 103VU 126 822 |
| 13MJ RELAY 103VU 126 822 |
| 12MJ PROXIMITY SWITCH OF LOCKING MECH 826 826AR 52-35-13 |
| 11MJ RELAY 103VU 126 822 |
| 10MJ RELAY 103VU 126 822 |
| 9MJ INDICATOR LIGHT 134 134AR 52-35-12 |
| 8MJ INDICATOR LIGHT 2027VU2 154 154AR 52-35-12 |
| 6MJ TIME RELAY 103VU 126 822 |
| 5MJ PROXIMITY SWITCH OF LOCKING MECH 825 825AR 52-35-13 |
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| FIN ! FUNCTIONAL DESIGNATION ! PANEL!ZONE!ACCESS ! ATA |
| ! ! ! ! ! REF. |
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| 2500MJ ELECTRO-MANUAL SELECTOR VALVE 2006VU 198 198CB 52-36-12 |
| 2501MJ MANUAL SELECTOR VALVE 134 134AR 52-36-15 |
| 2502MJ DOOR ACTUATOR 132 825 52-36-18 |
| 2503MJ DOOR ACTUATOR 132 825 52-36-18 |
| 2504MJ MANUAL SELECTOR VALVE 154 154AR 52-36-15 |
| 2505MJ DOOR ACTUATOR 152 826 52-36-18 |
| 2506MJ DOOR ACTUATOR 152 826 52-36-18 |
| 2507MJ LIMIT SWITCH OF DOOR SILL LATCH 2004VU1 132 825 52-35-13 |
| 2507MJ LIMIT SWITCH OF DOOR SILL LATCH 2004VU2 132 825 52-35-13 |
| 2507MJ LIMIT SWITCH OF DOOR SILL LATCH 2004VU3 152 826 52-35-13 |
| 2507MJ LIMIT SWITCH OF DOOR SILL LATCH 2004VU4 152 826 52-35-13 |
| 2508MJ LIMIT SWITCH OF SERVO MECHANISM 132 825 52-35-13 |
| 2509MJ LIMIT SWITCH OF SERVO MECHANISM 152 826 52-35-13 |
| 15MJ RELAY 103VU 126 822 |
| 14MJ RELAY 103VU 126 822 |
| 13MJ RELAY 103VU 126 822 |
| 12MJ PROXIMITY SWITCH OF LOCKING MECH 826 826AR 52-35-13 |
| 11MJ RELAY 103VU 126 822 |
| 10MJ RELAY 103VU 126 822 |
| 9MJ INDICATOR LIGHT 134 134AR 52-35-12 |
| 8MJ INDICATOR LIGHT 2027VU2 154 154AR 52-35-12 |
| 6MJ TIME RELAY 103VU 126 822 |
| 5MJ PROXIMITY SWITCH OF LOCKING MECH 825 825AR 52-35-13 |
3. System Description
Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL
Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL
Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL
Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL
When the cargo door is unlatched, the proximity switch 5MJ (12MJ) gives a related signal to the Landing Gear Control and Interface Unit 5GA2 (LGCIU). Also, the LGCIU receives an input signal from the internal proximity switch of the manual selector valve 2501MJ (2504MJ) when it is operated. The logic of the LGCIU (Ref AMM 32-31-00) processes all these signals to give an output signal.
When the aircraft is on the ground, the L/G position relay 12GB is energized. This causes the LGCIU output signal to energize the time relay 6MJ and the relay 15MJ.
The energized time relay 6MJ then operates the electrical circuit GX (Ref. 29-24-00). This causes the electric pump 3075GX of the yellow hydraulic system to operate and pressurizes the door hydraulic system.
The circuitry of the relays 10MJ, 11MJ, 13MJ and 14MJ transmits the electrical power from the energized relay 15MJ to the electro-manual selector valve 2500MJ. Also, this circuitry of the relays controls the logic between the hydraulic operation of the FWD cargo door and the electrical control system of the AFT cargo door.
An open door control circuit causes the relay 15MJ to de-energize and the electro-manual selector valve 2500MJ has no electrical power.
Because of the time relay 6MJ, the electrical circuit GX stays energized 10 seconds longer to operate the electric pump 3075GX continuously.
When the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are locked internally, their internal proximity switches transmit a signal to the green indicator light 9MJ (8MJ) that comes on.
The series-connected limit switches 2507MJ and 2508MJ (2509MJ) transmit a ground signal to the Landing Gear Control and Interface Unit 5GA2 (LGCIU). This signal shows that the limit switches in the door sill area are in their lifted position.
When the cargo door is unlatched, the proximity switch 5MJ (12MJ) also gives a related signal to the LGCIU. Also, the LGCIU receives also an input signal from the internal proximity switch of the manual selector valve 2501MJ (2504MJ) when it is operated.
The logic of the LGCIU (Ref. AMM 32-32-00) processes all these signals to an output signal.
When the aircraft is on the ground, the L/G position relay 12GB is energized. This causes the LGCIU output signal to energize the time relay 6MJ and the relay 15MJ.
The energized time relay 6MJ then operates the electrical circuit GX (Ref. 29-24-00). This causes the electric pump 3075GX of the yellow hydraulic system to operate and pressurizes the door hydraulic system.
The circuitry of the relays 10MJ, 11MJ, 13MJ and 14MJ transmits the electrical power from the energized relay 15MJ to the electro-manual selector valve 2500MJ. Also, this circuitry of the relays controls the logic between the hydraulic operation of the FWD cargo door and the electrical control system of the AFT cargo door.
An open door control circuit causes the relay 15MJ to de-energize and the electro-manual selector valve 2500MJ has no electrical power.
Because of the time relay 6MJ, the electrical circuit GX stays energized 10 seconds longer to operate the electric pump 3075GX continuously.
When the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are locked internally, their internal proximity switches transmit a signal to the green indicator light 9MJ (8MJ) that comes on.
** ON A/C NOT FOR ALL Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL Schematic of Electrical Door Control System ** ON A/C NOT FOR ALL NOTE: The component identifications in brackets are for the electrical control system components of the AFT cargo door.
The electrical control system of the cargo doors controls the door hydraulic system as follows: When the cargo door is unlatched, the proximity switch 5MJ (12MJ) gives a related signal to the Landing Gear Control and Interface Unit 5GA2 (LGCIU). Also, the LGCIU receives an input signal from the internal proximity switch of the manual selector valve 2501MJ (2504MJ) when it is operated. The logic of the LGCIU (Ref AMM 32-31-00) processes all these signals to give an output signal.
When the aircraft is on the ground, the L/G position relay 12GB is energized. This causes the LGCIU output signal to energize the time relay 6MJ and the relay 15MJ.
The energized time relay 6MJ then operates the electrical circuit GX (Ref. 29-24-00). This causes the electric pump 3075GX of the yellow hydraulic system to operate and pressurizes the door hydraulic system.
The circuitry of the relays 10MJ, 11MJ, 13MJ and 14MJ transmits the electrical power from the energized relay 15MJ to the electro-manual selector valve 2500MJ. Also, this circuitry of the relays controls the logic between the hydraulic operation of the FWD cargo door and the electrical control system of the AFT cargo door.
An open door control circuit causes the relay 15MJ to de-energize and the electro-manual selector valve 2500MJ has no electrical power.
Because of the time relay 6MJ, the electrical circuit GX stays energized 10 seconds longer to operate the electric pump 3075GX continuously.
When the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are locked internally, their internal proximity switches transmit a signal to the green indicator light 9MJ (8MJ) that comes on.
NOTE: The component identifications in brackets are for the electrical control system components of the AFT cargo door.
The electrical control system of the cargo door controls the door hydraulic system as follows: The series-connected limit switches 2507MJ and 2508MJ (2509MJ) transmit a ground signal to the Landing Gear Control and Interface Unit 5GA2 (LGCIU). This signal shows that the limit switches in the door sill area are in their lifted position.
When the cargo door is unlatched, the proximity switch 5MJ (12MJ) also gives a related signal to the LGCIU. Also, the LGCIU receives also an input signal from the internal proximity switch of the manual selector valve 2501MJ (2504MJ) when it is operated.
The logic of the LGCIU (Ref. AMM 32-32-00) processes all these signals to an output signal.
When the aircraft is on the ground, the L/G position relay 12GB is energized. This causes the LGCIU output signal to energize the time relay 6MJ and the relay 15MJ.
The energized time relay 6MJ then operates the electrical circuit GX (Ref. 29-24-00). This causes the electric pump 3075GX of the yellow hydraulic system to operate and pressurizes the door hydraulic system.
The circuitry of the relays 10MJ, 11MJ, 13MJ and 14MJ transmits the electrical power from the energized relay 15MJ to the electro-manual selector valve 2500MJ. Also, this circuitry of the relays controls the logic between the hydraulic operation of the FWD cargo door and the electrical control system of the AFT cargo door.
An open door control circuit causes the relay 15MJ to de-energize and the electro-manual selector valve 2500MJ has no electrical power.
Because of the time relay 6MJ, the electrical circuit GX stays energized 10 seconds longer to operate the electric pump 3075GX continuously.
When the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are locked internally, their internal proximity switches transmit a signal to the green indicator light 9MJ (8MJ) that comes on.
4. Power Supply
The service busbar 601PP supplies the electrical door control system with 28 V DC through the circuit breaker 1MJ. The closed circuit breaker safeties the subsequent components with 5 A:
** ON A/C NOT FOR ALL The service busbar 601PP supplies the electrical door control system with 28 V DC through the circuit breaker 1MJ. The closed circuit breaker safeties the subsequent components with 5 A:
- the indicator lights 9MJ and 8MJ
- the time relay 6MJ in 103VU
- the relays 10MJ, 11MJ and 15MJ in 103VU
- the proximity switches of the door actuators 2502MJ, 2503MJ, 2505MJ and 2506MJ
- the proximity switches of the manual selector valves 2501MJ and 2504MJ.
5. Component Description
A. Electro-Manual Selector Valve FIN: 2500-MJ
If the internal solenoid of this valve is energized, this releases its internal pilot valve. Then, the internal main valve opens and the HP fluid can flow through.
If the internal solenoid of this valve is energized, this releases its internal pilot valve. Then, the internal main valve opens and the HP fluid can flow through.
B. Manual Selector Valve FIN: 2501-MJ FIN: 2504-MJ
The internal proximity switch of the manual selector valve is part of the door control system. This proximity switch closes the electrical circuit when the selector of this valve is in the "OPEN" or "CLOSE" position. This operation usually starts the electric pump of the yellow hydraulic system.
The internal proximity switch of the manual selector valve is part of the door control system. This proximity switch closes the electrical circuit when the selector of this valve is in the "OPEN" or "CLOSE" position. This operation usually starts the electric pump of the yellow hydraulic system.
C. Door Actuators FIN: 2502-MJ FIN: 2503-MJ FIN: 2505-MJ FIN: 2506-MJ
The internal proximity switches of the door actuators are connected in series. They give a signal to show the operator that the door actuators are fully extended and locked internally.
The internal proximity switches of the door actuators are connected in series. They give a signal to show the operator that the door actuators are fully extended and locked internally.
D. Indicator Light FIN: 8-MJ FIN: 9-MJ
The green indicator light gets a signal from the internal proximity switches of the door actuators. It comes on when the door actuators are fully extended and locked internally. The light goes off as soon as the internal locking mechanism of the door actuator is released.
The green indicator light gets a signal from the internal proximity switches of the door actuators. It comes on when the door actuators are fully extended and locked internally. The light goes off as soon as the internal locking mechanism of the door actuator is released.
E. Cargo-Compartment Door Control Switches
(1) Limit Switches 2507MJ and 2508MJ (2509MJ)
These series-connected limit switches in the door sill area prevent the hydraulic operation of the cargo door, when:
These series-connected limit switches in the door sill area prevent the hydraulic operation of the cargo door, when:
- the pedal of the door sill latch 2004VU is pushed down. This sets the related YZ-latch to the lower position and operates the limit switch 2507MJ.
- the overrideable Y-latch of the door sill latch 2004VU is moved down. The related drawbar then operates the limit switch 2508MJ (2509MJ).
F. Proximity Switch 5MJ (12MJ)
The proximity switch monitors the condition of the locking mechanism. It prevents the hydraulic operation if the cargo door is still locked.
The proximity switch monitors the condition of the locking mechanism. It prevents the hydraulic operation if the cargo door is still locked.
6. Operation
A. Open Mode of the Cargo Doors
(1) Open Mode
Then, the duplex door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) extend until the cargo door is fully opened. The green indicator light 9MJ (8MJ) comes on when the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are in their locked positions.
NOTE: The component identifications in brackets are for the electrical control system components of the AFT cargo door.
When the door locking handle is in the UNLOCKED position this operates the proximity switch 5MJ (12MJ) of the locking mechanism. The door control circuit MJ is closed when the selector on the control panel is in the OPEN position. Then: - the electro-manual selector valve 2500MJ opens,
- the manual selector valve 2501MJ (2504MJ) moves in the extension mode,
- the electric pump 3075GX starts to pressurize the door hydraulic system.
Then, the duplex door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) extend until the cargo door is fully opened. The green indicator light 9MJ (8MJ) comes on when the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are in their locked positions.
B. Close Mode of the Cargo Doors
(1) Close Mode
When the selector on the control panel is in the CLOSED position, this closes the door control circuit MJ. Then:
Thus, the green indicator light 9MJ (8MJ) goes off as soon as the duplex door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) retract. This retraction closes the cargo door.
When the selector on the control panel is in the CLOSED position, this closes the door control circuit MJ. Then:
- the electro-manual selector valve 2500MJ opens
- the manual selector valve 2501MJ (2504MJ) moves to its closed position
- the electric pump 3075GX starts to pressurize the door hydraulic system.
Thus, the green indicator light 9MJ (8MJ) goes off as soon as the duplex door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) retract. This retraction closes the cargo door.
(2) Close Mode
When the manual YZ-latches and the overrideable Y-latches (part of each door sill latch) are lifted, the limit switches 2507MJ and 2508MJ (2509MJ) are operated. The door control circuit MJ is closed, when the selector on the control panel is in the CLOSED position. Then:
Thus, the green indicator light 9MJ (8MJ) goes off as soon as the duplex door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) retract. This retraction closes the cargo door.
When the manual YZ-latches and the overrideable Y-latches (part of each door sill latch) are lifted, the limit switches 2507MJ and 2508MJ (2509MJ) are operated. The door control circuit MJ is closed, when the selector on the control panel is in the CLOSED position. Then:
- the electro-manual selector valve 2500MJ opens
- the manual selector valve 2501MJ (2504MJ) moves to the retraction mode
- the electric pump 3075GX starts to pressurize the door hydraulic system.
Thus, the green indicator light 9MJ (8MJ) goes off as soon as the duplex door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) retract. This retraction closes the cargo door.