DOC AIRBUS | AMM A320FCONTROL AND INDICATING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The passenger oxygen control and indicating system controls the operation of the passenger oxygen system.
** ON A/C NOT FOR ALL The passenger oxygen control and indicating system controls the operation of the passenger oxygen system.
2. Component Location
Passenger Oxygen System - Control and Indicating ** ON A/C NOT FOR ALL
Passenger Oxygen System - Control and Indicating ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Passenger Oxygen System - Control and Indicating ** ON A/C NOT FOR ALL Passenger Oxygen System - Control and Indicating ** ON A/C NOT FOR ALL | ------------------------------------------------------------------------------- |
| FIN ! FUCTIONAL DESIGNATION ! PANEL!ZONE!ACCESS! ATA |
| ! ! ! ! DOOR ! REF. |
| ------------------------------------------------------------------------------- |
| 8WR RELAY-BOARD ANN LT TEST & INTFC 103VU 126 822 |
| 9WR RELAY-SYS OFF 103VU 126 822 |
| 10WR RELAY-PWR SUPPLY 103VU 126 824 |
| 12WR P/BSW-OXYGEN PASSENGER 21VU 211 831 |
| 13WR P/BSW-OXYGEN/TMR RESET 50VU 211 831 |
| 14WR P/BSW-OXYGEN/MASK MAN ON 21VU 211 831 |
| 16WR ALTITUDE PRESS SW 127 824 35-23-15 |
| 19WR RELAY PASS INFO 103VU 126 822 |
| 25WR RELAY-TIME 2001VU 263 |
3. System Description
Passenger Oxygen system - Electrical Schematic
Passenger Oxygen system - Electrical Schematic ** ON A/C NOT FOR ALL
Passenger Oxygen System - Electrical Schematic ** ON A/C NOT FOR ALL
Passenger Oxygen System - Electrical Schematic ** ON A/C NOT FOR ALL
Passenger Oxygen system - Electrical Schematic ** ON A/C NOT FOR ALL
The manual controls and indications for the passenger oxygen system are on the overhead panel 21VU and on the maintenance panel 50VU.
The altitude pressure switch 16WR (installed in the avionics compartment) starts the automatic operation of the passenger oxygen system. If the altitude pressure switch does not work, you can press the MASK MAN ON pushbutton switch 14WR.
The TMR RESET pushbutton switch 13WR lets the pilot reset the controls after the operation of the system.
When the system starts to operate, the SYS ON indicator light 12WR comes on. Passenger information relay 19WR will start a recorded announcement, if the below conditions are applied:
The two time-delay relays 8WR and 9WR de-energize the power relay 10WR after 30 s.
If both time delay relays do not operate 30 s. after the start of the system operation, the FAULT indicator light (located on the TMR RESET pushbutton switch 13WR) comes on.
When the TMR RESET pushbutton switch is pushed, the SYS ON indicator light and OXY PAX ON indication will go off. The ON indicator light (located on the TMR RESET pushbutton switch) will come on while the TMR RESET pushbutton switch is pushed.
At the end of the recorded announcement it stops automatically.
When the system starts to operate, the SYS ON indicator light 12WR comes on. Passenger information relay 19WR will start a recorded announcement, if the below conditions are applied:
The two time-delay relays 8WR and 9WR de-energize the power relay 10WR after 30 s.
If both time delay relays do not operate 30 s. after the start of the system operation, the FAULT indicator light (located on the TMR RESET pushbutton switch 13WR) comes on.
When the TMR RESET pushbutton switch is pushed, the SYS ON indicator light and OXY PAX ON indication will go off. The ON indicator light (located on the TMR RESET pushbutton switch) will come on while the TMR RESET pushbutton switch is pushed. When you push the PRE REC ANN STOP membrane switch on the FAP 120RH the taped announcements will stop.
** ON A/C NOT FOR ALL Passenger Oxygen system - Electrical Schematic Passenger Oxygen system - Electrical Schematic ** ON A/C NOT FOR ALL Passenger Oxygen System - Electrical Schematic ** ON A/C NOT FOR ALL Passenger Oxygen System - Electrical Schematic ** ON A/C NOT FOR ALL Passenger Oxygen system - Electrical Schematic ** ON A/C NOT FOR ALL The manual controls and indications for the passenger oxygen system are on the overhead panel 21VU and on the maintenance panel 50VU.
The altitude pressure switch 16WR (installed in the avionics compartment) starts the automatic operation of the passenger oxygen system. If the altitude pressure switch does not work, you can press the MASK MAN ON pushbutton switch 14WR.
The TMR RESET pushbutton switch 13WR lets the pilot reset the controls after the operation of the system.
When the system starts to operate, the SYS ON indicator light 12WR comes on. Passenger information relay 19WR will start a recorded announcement, if the below conditions are applied:
- If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX is installed and
- If announcement content is recorded into the PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX and
- If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX function is there in the Cabin Assignment Module (CAM) P/N installed on the aircraft (Ref. AMM D/O 23-32-00-00).
The two time-delay relays 8WR and 9WR de-energize the power relay 10WR after 30 s.
If both time delay relays do not operate 30 s. after the start of the system operation, the FAULT indicator light (located on the TMR RESET pushbutton switch 13WR) comes on.
When the TMR RESET pushbutton switch is pushed, the SYS ON indicator light will go off. The ON indicator light (located on the TMR RESET pushbutton switch) will come on while the TMR RESET pushbutton switch is pushed.
At the end of the recorded announcement it stops automatically.
- If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX is installed and
- If announcement content is recorded into the PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX and
- If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX function is there in the Cabin Assignment Module (CAM) P/N installed on the aircraft (Ref. AMM D/O 23-32-00-00).
The color of the OXY PAX ON indicator on the Engine/Warning Display can be: - Green when both CPC (11HL and 12HL) senses higher than ground altitude
- Amber when one or both CPC (11HL and 12HL) senses ground altitude.
The two time-delay relays 8WR and 9WR de-energize the power relay 10WR after 30 s.
If both time delay relays do not operate 30 s. after the start of the system operation, the FAULT indicator light (located on the TMR RESET pushbutton switch 13WR) comes on.
When the TMR RESET pushbutton switch is pushed, the SYS ON indicator light and OXY PAX ON indication will go off. The ON indicator light (located on the TMR RESET pushbutton switch) will come on while the TMR RESET pushbutton switch is pushed.
At the end of the recorded announcement it stops automatically.
When the system starts to operate, the SYS ON indicator light 12WR comes on. Passenger information relay 19WR will start a recorded announcement, if the below conditions are applied:
- If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX is installed and
- If announcement content is recorded into the PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX and
- If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX function is there in the Cabin Assignment Module (CAM) P/N installed on the aircraft (Ref. AMM D/O 23-32-00-00).
The color of the OXY PAX ON indicator on the Engine/Warning Display can be: - Green when both CPC (11HL and 12HL) senses higher than ground altitude
- Amber when one or both CPC (11HL and 12HL) senses ground altitude.
The two time-delay relays 8WR and 9WR de-energize the power relay 10WR after 30 s.
If both time delay relays do not operate 30 s. after the start of the system operation, the FAULT indicator light (located on the TMR RESET pushbutton switch 13WR) comes on.
When the TMR RESET pushbutton switch is pushed, the SYS ON indicator light and OXY PAX ON indication will go off. The ON indicator light (located on the TMR RESET pushbutton switch) will come on while the TMR RESET pushbutton switch is pushed. When you push the PRE REC ANN STOP membrane switch on the FAP 120RH the taped announcements will stop.
4. Component Description
A. Altitude Pressure Switch 16WR
The altitude pressure switch (16WR) closes when the cabin pressure decreases to a pressure equivalent to 14000 -750 ft. or +250 ft. (4267.12 -228.60 m or +76.20 m). This starts the emergency oxygen-supply system.
The altitude pressure switch (16WR) closes when the cabin pressure decreases to a pressure equivalent to 14000 -750 ft. or +250 ft. (4267.12 -228.60 m or +76.20 m). This starts the emergency oxygen-supply system.
B. Oxygen Power Relay 10WR
The oxygen power relay (10WR) is installed in the avionics compartment. It controls the 115 V AC supply to the door latches of the emergency oxygen containers.
The oxygen power relay (10WR) is installed in the avionics compartment. It controls the 115 V AC supply to the door latches of the emergency oxygen containers.
C. MASK MAN ON pushbutton switch 14WR
If the altitude pressure switch (16WR) fails, the MASK MAN ON pushbutton switch (14WR) will activate the emergency oxygen system. This pushbutton switch will override the altitude pressure switch (16WR). A safety guard is installed over the pushbutton switch.
If the altitude pressure switch (16WR) fails, the MASK MAN ON pushbutton switch (14WR) will activate the emergency oxygen system. This pushbutton switch will override the altitude pressure switch (16WR). A safety guard is installed over the pushbutton switch.
D. TMR RESET pushbutton switch 13WR
TMR RESET pushbutton switch (13WR) will reset the control circuit after operation. It is located on the panel 50VU.
TMR RESET pushbutton switch (13WR) will reset the control circuit after operation. It is located on the panel 50VU.
E. Passenger Information Relay 19WR
The passenger information relay 19WR, if PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX is installed, will start the recorded announcement on the passenger address system. It supplies the hold-in circuit for the SYS ON indicator light 12WR.
The passenger information relay (19WR) will start the recorded announcement on the passenger address system. It supplies the hold-in circuit for the SYS ON indicator light (12WR).
The passenger information relay 19WR, if PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX is installed, will start the recorded announcement on the passenger address system. It supplies the hold-in circuit for the SYS ON indicator light 12WR.
The passenger information relay (19WR) will start the recorded announcement on the passenger address system. It supplies the hold-in circuit for the SYS ON indicator light (12WR).
F. Time Delay Relays 8WR and 9WR
The 30 second time delay relays (8WR and 9WR) are the slow-to-make type. They switch off the 28 V DC supply to the oxygen power relay (10WR). The contacts are connected in series to prevent damage to the solenoids, if one relay fails.
The 30 second time delay relays (8WR and 9WR) are the slow-to-make type. They switch off the 28 V DC supply to the oxygen power relay (10WR). The contacts are connected in series to prevent damage to the solenoids, if one relay fails.
G. Indicator Lights
The SYS ON indicator light (12WR) comes on when the emergency oxygen system is operated. It is located on the panel 21VU. The FAULT indicator light on the TMR RESET pushbutton switch (13WR) comes on if the 30 second relays (8WR and 9WR) fail.
The SYS ON indicator light (12WR) comes on when the emergency oxygen system is operated. It is located on the panel 21VU. The FAULT indicator light on the TMR RESET pushbutton switch (13WR) comes on if the 30 second relays (8WR and 9WR) fail.
5. Operation
A. Automatic Operation
(1) If the cabin pressure decreases to a pressure equivalent to 14000 -750 ft. or +250 ft. (4267.12 -228.6 m or -228.6 m), the altitude pressure switch (16WR) closes.
When the altitude pressure switch (16WR) closes:
When the altitude pressure switch (16WR) closes:
- The emergency oxygen-supply system starts to operate.
- Busbar 401PP supplies 28 VDC to the oxygen power relay (10WR) through the time delay relays (8WR and 9WR).
Circuit breaker 1WR safeties the circuit.
Busbar 801XP supplies 115 VAC to the electrical latch assemblies of the emergency oxygen containers through circuit breakers 4WR thru 7WR.
(2) If the cabin pressure decreases to a pressure equivalent to 14000 -750 ft. or +250 ft. (4267.12 -228.6 m or -228.6 m), the altitude pressure switch (16WR) closes.
When the altitude pressure switch (16WR) closes:
Busbar 801XP supplies 115 VAC to the electrical latch assemblies of the emergency oxygen containers through circuit breakers 4WR thru 7WR.
When the altitude pressure switch (16WR) closes:
- The emergency oxygen-supply system starts to operate
- Busbar 801PP supplies 28 VDC to the oxygen power relay (10WR) through the time delay relays (8WR and 9WR).
Busbar 801XP supplies 115 VAC to the electrical latch assemblies of the emergency oxygen containers through circuit breakers 4WR thru 7WR.
(3) Each electrical latch assembly is supplied from two separate 115 V AC circuits. Each circuit supplies 115 V AC to the electrical latch assemblies on opposite sides of the cabin. The circuits make the crossover in the cabin in front and behind the impact area of uncontained engine rotor failure. The relay 25WR, at the rear of the cabin, closes in 6 seconds . This operates the intact circuit if one circuit is damaged. This configuration makes sure that there is a 100 % supply of 115 V AC to the emergency oxygen containers. This occurs if an engine rotor failure damage a circuit.
(4) The sequence of operation is as follows:
(a) The oxygen power relay 10WR is energized.
(b) The emergency-oxygen container doors open and the oxygen masks fall out (Ref. AMM D/O 35-21-00-00).
(c) The indicator light SYS ON 12WR comes on.
(d) The indication OXY PAX ON on the Engine Warning Display comes on.
(e) If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX is installed, the passenger information relay 19WR starts the recorded announcement, which is transmitted over the passenger address system (Ref. AMM D/O 23-32-00-00).
(f) The time delay relays 8WR and 9WR operate 30 seconds after the operation of the altitude pressure switch 16WR. They switch off the supply to the oxygen power relay 10WR.
(g) If a failure of the time delay relays 8WR and 9WR occurs, the FAULT indicator light on the TMR RESET 13WR pushbutton switch comes on.
(h) When the TMR RESET 13WR pushbutton switch is pressed, the indicator light SYS ON 12WR and OXY PAX ON on the Engine Warning Display go off. The ON indicator light (on the TMR RESET pushbutton switch 13WR) comes on while the TMR RESET pushbutton switch is pressed.
(i) If the recorded announcement is transmitted on the passenger address system, it will stop automatically when it is completed.
(5) The sequence of operation is as follows:
(a) The oxygen power relay 10WR is energized.
(b) The emergency-oxygen container doors open and the oxygen masks fall out (Ref. AMM D/O 35-21-00-00).
(c) The indicator light SYS ON 12WR comes on.
(d) If PRAM 10RX, I-PRAM 117RH or Voice Synthesizer Unit 11RX is installed, the passenger information relay 19WR starts the recorded announcement, which is transmitted over the passenger address system (Ref. AMM D/O 23-32-00-00).
(e) The time delay relays 8WR and 9WR operate 30 seconds after the operation of the altitude pressure switch 16WR. They switch off the supply to the oxygen power relay 10WR.
(f) If a failure of the time delay relays 8WR and 9WR occurs, the FAULT indicator light on the TMR RESET 13WR pushbutton switch comes on.
(g) When the TMR RESET 13WR pushbutton switch is pressed, the indicator light SYS ON 12WR, goes off. The ON indicator light (on the TMR RESET pushbutton switch 13WR) comes on while the TMR RESET pushbutton switch is pressed.
(h) If the recorded announcement is transmitted on the passenger address system, it will stop automatically when it is completed.
B. Manual Operation
The MASK MAN ON pushbutton switch (14WR) operates the emergency oxygen system when pressed. The sequence of operation will then follow the automatic operation sequence but the altitude pressure switch (16WR) does not operate.
The MASK MAN ON pushbutton switch (14WR) operates the emergency oxygen system when pressed. The sequence of operation will then follow the automatic operation sequence but the altitude pressure switch (16WR) does not operate.
C. Door Malfunction
You can open the door of the emergency oxygen container manually, if a malfunction of the electrical latch occurs (Ref. AMM D/O 35-21-00-00).
You can open the door of the emergency oxygen container manually, if a malfunction of the electrical latch occurs (Ref. AMM D/O 35-21-00-00).
6. Ground Test
A. Emergency Oxygen Container (Chemical)
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push MASK MAN ON pushbutton switch 14WR. The oxygen masks do not fall out, if you pull out the test buttons on the emergency containers and turn them 90 degrees. This lets the doors open some degrees when you do the ground test. After the test, close the door and turn the test buttons back 90 degrees to the initial position.
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push the MASK MAN ON pushbutton switch 14WR (Ref. AMM D/O 35-23-00-00). The oxygen masks do not fall out, if you push the left side of the test button on the door assembly of the emergency containers. Push the test button until the over-center spring keeps the lever of the test button at 90 degrees to the door surface. This lets the doors open some degrees when you do the ground test. After the test, close the doors and push the test button back to the initial position.
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push the MASK MAN ON pushbutton switch 14WR (Ref. AMM D/O 35-23-00-00). The oxygen masks do not fall out, if you set the test buttons on the emergency containers to the test position.
Pull and turn the test button 90 degrees, or push the left side of the test button until the over-center spring keeps it in vertical position. This lets the doors open some degrees when you do the ground test. After the test, close the door and turn the test buttons back to the initial position.
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push MASK MAN ON pushbutton switch 14WR. The oxygen masks do not fall out, if you pull out the test buttons on the emergency containers and turn them 90 degrees. This lets the doors open some degrees when you do the ground test. After the test, close the door and turn the test buttons back 90 degrees to the initial position.
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push the MASK MAN ON pushbutton switch 14WR (Ref. AMM D/O 35-23-00-00). The oxygen masks do not fall out, if you push the left side of the test button on the door assembly of the emergency containers. Push the test button until the over-center spring keeps the lever of the test button at 90 degrees to the door surface. This lets the doors open some degrees when you do the ground test. After the test, close the doors and push the test button back to the initial position.
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push the MASK MAN ON pushbutton switch 14WR (Ref. AMM D/O 35-23-00-00). The oxygen masks do not fall out, if you set the test buttons on the emergency containers to the test position.
Pull and turn the test button 90 degrees, or push the left side of the test button until the over-center spring keeps it in vertical position. This lets the doors open some degrees when you do the ground test. After the test, close the door and turn the test buttons back to the initial position.
B. Emergency Oxygen Container with Oxygen Cylinder Assembly
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push the MASK MAN ON pushbutton switch 14WR.
The oxygen masks will not fall out if you set the test buttons on the emergency containers to the test position. To set the test button to the test position, push its right side until the center spring holds it in place vertically. This lets the door open some degrees when you do the ground test. After the test, close the door and turn the test button back to the initial position.
If the oxygen pressure increases above safety limit, oxygen cylinder assembly releases oxygen through depletion outlet. During this process oxygen flow turns the test button to the test position and ejects pressure-loss indicator (Ref. AMM D/O 35-21-00-00). Emergency oxygen container must be replaced with a new one if the pressure-loss indicator is visible.
To make sure that the doors of the emergency oxygen containers open, do a ground test periodically. To check that the electrical latches operate correctly, push MASK MAN ON pushbutton switch 14WR.
The oxygen masks do not fall out, if you pull out the test buttons on the emergency containers and turn them 90 degrees. This lets the door open some degrees when you do the ground test. After the test, close the door and turn the test button back 90 degrees to the initial position.
If the oxygen pressure increases above safety limit, oxygen cylinder assembly releases oxygen through depletion outlet. During this process, oxygen flow turns the test button to the test position and ejects pressure loss indicator (Ref. AMM D/O 35-21-00-00). Emergency oxygen container must be replaced with a new emergency oxygen container if the pressure loss indicator is visible.
To make sure that the doors of the emergency oxygen containers open, do a periodic ground test. To check that the electrical latches operate correctly, push the MASK MAN ON pushbutton switch 14WR.
The oxygen masks will not fall out if you set the test buttons on the emergency containers to the test position. To set the test button to the test position, push its right side until the center spring holds it in place vertically. This lets the door open some degrees when you do the ground test. After the test, close the door and turn the test button back to the initial position.
If the oxygen pressure increases above safety limit, oxygen cylinder assembly releases oxygen through depletion outlet. During this process oxygen flow turns the test button to the test position and ejects pressure-loss indicator (Ref. AMM D/O 35-21-00-00). Emergency oxygen container must be replaced with a new one if the pressure-loss indicator is visible.
To make sure that the doors of the emergency oxygen containers open, do a ground test periodically. To check that the electrical latches operate correctly, push MASK MAN ON pushbutton switch 14WR.
The oxygen masks do not fall out, if you pull out the test buttons on the emergency containers and turn them 90 degrees. This lets the door open some degrees when you do the ground test. After the test, close the door and turn the test button back 90 degrees to the initial position.
If the oxygen pressure increases above safety limit, oxygen cylinder assembly releases oxygen through depletion outlet. During this process, oxygen flow turns the test button to the test position and ejects pressure loss indicator (Ref. AMM D/O 35-21-00-00). Emergency oxygen container must be replaced with a new emergency oxygen container if the pressure loss indicator is visible.