W DOC AIRBUS | AMM A320F

Functional Check of Automatic Mask Release, Detailed Inspection of Masks and Visual Check of Chemical Oxygen Generators

TASK 35-23-00-720-003-A
Functional Check of Automatic Mask Release, Detailed Inspection of Masks and Visual Check of Chemical Oxygen Generators

WARNING: KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL SOURCE OF OXYGEN. OXYGEN BECOMES EXPLOSIVE WHEN IT TOUCHES HYDROCARBONS.
WARNING: CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE CLEAN TO PREVENT CONTAMINATION OF THE OXYGEN SYSTEM.
ZONE: 200
1. Reason for the Job
Refer to the MPD TASK: 352000-02
FUNCTIONAL CHECK OF AUTOMATIC MASK RELEASE, DETAILED INSPECTION OF MASKS AND VISUAL CHECK OF CHEMICAL OXYGEN GENERATORS
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI)
No specific
AR
WARNING NOTICE(S)
98A35207599000
1
HOSE-ADAPTER,ALTITUDE SWITCH
995000-00
1
TOOL-MANUAL RELEASE
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
200
UPPER HALF FUSELAGE
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 23-73-00-861-001-A
Energize the Cabin Intercommunication Data System (CIDS)
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 35-00-00-860-001-A
Special Precautions When Working on a Gaseous Oxygen System
TASK 35-21-00-920-001-A
Discard Chemical Oxygen Generators
TASK 35-21-41-000-001-A
Removal of the Emergency Oxygen Containers
TASK 35-21-41-400-001-A
Installation of the Emergency Oxygen Containers
TASK 35-21-42-400-001-A
Installation of the Emergency Oxygen Generators
TASK 35-21-43-550-801-A
Packing of the Oxygen Mask Assemblies
TASK 35-21-43-550-802-A
Packing of the Oxygen Mask Assemblies in Decentralized Gaseous-Oxygen Container
TASK 35-21-00-00
OXYGEN STORAGE - DESCRIPTION AND OPERATION
F Installation and Removal of the Hose Adapter on the Altitude Switch
3. Job Set-up
Subtask 35-23-00-860-093-A
A. Aircraft Maintenance Configuration
   (1) Obey the special precautions when you work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
   (2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
   (3) In the cockpit, on the OXYGEN section of the overhead panel 21VU, put the WARNING NOTICE(S) in position to tell persons not to operate the emergency oxygen system.
   (4) Make sure that the Cabin Intercommunication Data System (CIDS) is energized (Ref. AMM TASK 23-73-00-861-001).
Subtask 35-23-00-865-054-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUOXYGEN/PASSENGER/ACTUATION7WRHA08
49VUOXYGEN/PASSENGER/ACTUATION6WRHA07
49VUOXYGEN/PASSENGER/ACTUATION5WRHA06
49VUOXYGEN/PASSENGER/ACTUATION4WRHA05
49VUOXYGEN/PASSENGER/CTL AND WARN3WRHA04
49VUOXYGEN/PASSENGER/CTL AND WARN2WRHA03
49VUOXYGEN/PASSENGER/CTL AND WARN1WRHA02
** ON A/C NOT FOR ALL
2000VUPRAM2RXE01
Subtask 35-23-00-010-052-A
C. Get Access to the Avionics Compartment
   (1) Open access doors 812 and 824.
Subtask 35-23-00-480-062-A
D. Connection of the Ground Pressure Equipment
F Installation and Removal of the Hose Adapter on the Altitude Switch
   (1) Make sure that you do not disconnect the electrical connection from altitude pressure switch 16WR (1).
   (2) Connect the VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI) to the connector (3) of altitude pressure switch 16WR (1) with the 98A35207599000 HOSE-ADAPTER,ALTITUDE SWITCH (2).
4. Procedure
Subtask 35-23-00-210-064-A ** ON A/C NOT FOR ALL
A. Detailed Inspection of the Oxygen Masks and Visual Check of the Chemical Oxygen Generators
CAUTION: DO NOT PULL THE MASK LANYARD FROM THE END WITH THE RELEASE PIN. IF YOU PULL ON THIS END OF THE LANYARD, YOU WILL REMOVE THE RELEASE PIN AND START A FLOW OF OXYGEN WHICH CANNOT BE STOPPED.
   (1) Remove an emergency oxygen container from its position (Ref. AMM TASK 35-21-41-000-001).
   (2) Use the 995000-00 TOOL-MANUAL RELEASE and open the emergency-oxygen container door.
NOTE: It is permitted to use alternative tool with part number 995000.
   (3) Examine the chemical oxygen generator:
     (a) Make sure that the condition indicator is yellow or pink.
       1 If the condition indicator is black or blue, replace the chemical oxygen generator (Ref. AMM TASK 35-21-00-920-001).
     (b) Make sure that there is no damage, corrosion, cracks or tension on the outlet fitting(s).
     (c) Make sure that the oxygen generator is serviceable:
  • Read the manufacturing date on the label of the oxygen generator.
  • Obey the manufacturer's instructions.
   (4) Examine the oxygen masks and flexible supply hoses for cracks, dirt or changes in color.
WARNING: MAKE SURE THAT THE FLEXIBLE HOSES ARE IN THE CORRECT CONDITION. IF THEY ARE TWISTED, DAMAGED, DEFORMED OR INCORRECTLY INSTALLED, OXYGEN CANNOT FLOW THROUGH THE HOSES OR A LEAK CAN OCCUR.
   (5) Examine the flexible supply hoses and make sure that they are correctly connected to the reservoir bags and the outlets of the oxygen generator.
   (6) Examine the reservoir bags and make sure that:
  • There are no tears.
  • The reservoir bags are correctly connected to the masks.
  • You can read all legends.
   (7) Examine the elastic headbands for over-extension and elasticity and make sure that they are correctly attached to the masks.
CAUTION: DO NOT PULL THE MASK LANYARD FROM THE END WITH THE RELEASE PIN. IF YOU PULL ON THIS END OF THE LANYARD, YOU WILL REMOVE THE RELEASE PIN AND START A FLOW OF OXYGEN WHICH CANNOT BE STOPPED.
   (8) Do a check of the lanyards:
  • Strongly and shortly pull each lanyard at its mask-connection end. Make sure that the connection is satisfactory.
  • Make sure that each lanyard is free and does not catch other parts of the emergency oxygen container.
   (9) For chemical emergency-oxygen containers with installed foam pads:
WARNING: MAKE SURE THAT THE FOAM PAD IS INSTALLED ON THE IGNITION ACTUATOR OF THE OXYGEN GENERATOR ASSEMBLY. IF THE FOAM PAD IS MISSING, THERE IS A RISK THAT THE LANYARDS WILL WIND AROUND THE IGNITION ACTUATOR AND THAT THE RELEASE PIN WILL NOT COME OUT WHEN THE MASK(S) IS(ARE) PULLED.
     (a) Examine the foam pad(s) for correct installation (Ref. AMM TASK 35-21-42-400-001).
   (10) Put the oxygen masks into the emergency oxygen container (Ref. AMM TASK 35-21-43-550-801).
   (11) Install the emergency oxygen container (Ref. AMM TASK 35-21-41-400-001).
   (12) Do steps 1 thru 11 again for each emergency-oxygen container.
Subtask 35-23-00-210-064-B ** ON A/C NOT FOR ALL
A. Detailed Inspection of the Oxygen Masks and Visual Check of the Chemical Oxygen Generators
CAUTION: DO NOT PULL THE MASK LANYARD FROM THE END WITH THE RELEASE PIN. IF YOU PULL ON THIS END OF THE LANYARD, YOU WILL REMOVE THE RELEASE PIN AND START A FLOW OF OXYGEN WHICH CANNOT BE STOPPED.
   (1) Remove an emergency oxygen container from its position (Ref. AMM TASK 35-21-41-000-001).
   (2) Use the 995000-00 TOOL-MANUAL RELEASE and open the emergency-oxygen container door.
NOTE: It is permitted to use alternative tool with part number 995000.
   (3) Examine the chemical oxygen generator:
NOTE: This step is not applicable for the decentralized gaseous-oxygen containers installed in the lavatories. Decentralized gaseous-oxygen containers do not have an oxygen generator (Ref. AMM D/O 35-21-00-00).
     (a) Make sure that the condition indicator is yellow or pink.
       1 If the condition indicator is black or blue, replace the chemical oxygen generator (Ref. AMM TASK 35-21-00-920-001).
     (b) Make sure that there is no damage, corrosion, cracks or tension on the outlet fitting(s).
     (c) Make sure that the oxygen generator is serviceable:
  • Read the manufacturing date on the label of the oxygen generator.
  • Obey the manufacturer's instructions.
   (4) Examine the oxygen masks and flexible supply hoses for cracks, dirt or changes in color.
WARNING: MAKE SURE THAT THE FLEXIBLE HOSES ARE IN THE CORRECT CONDITION. IF THEY ARE TWISTED, DAMAGED, DEFORMED OR INCORRECTLY INSTALLED, OXYGEN CANNOT FLOW THROUGH THE HOSES OR A LEAK CAN OCCUR.
   (5) Examine the flexible supply hoses to make sure that they are correctly connected to the reservoir bags and the outlets of the oxygen generator or the cylinder assembly.
   (6) Examine the reservoir bags and make sure that:
  • There are no tears.
  • The reservoir bags are correctly connected to the masks.
  • You can read all legends.
   (7) Examine the elastic headbands for over-extension and elasticity and make sure that they are correctly attached to the masks.
CAUTION: DO NOT PULL THE MASK LANYARD FROM THE END WITH THE RELEASE PIN. IF YOU PULL ON THIS END OF THE LANYARD, YOU WILL REMOVE THE RELEASE PIN AND START A FLOW OF OXYGEN WHICH CANNOT BE STOPPED.
   (8) Do a check of the lanyards:
  • Strongly and shortly pull the lanyard at its mask-connection end. Make sure that the connection is satisfactory.
  • Make sure that each lanyard is free and does not catch other parts of the emergency oxygen container.
   (9) For chemical emergency-oxygen containers with installed foam pads:
WARNING: MAKE SURE THAT THE FOAM PAD IS INSTALLED ON THE IGNITION ACTUATOR OF THE OXYGEN GENERATOR ASSEMBLY. IF THE FOAM PAD IS MISSING, THERE IS A RISK THAT THE LANYARDS WILL WIND AROUND THE IGNITION ACTUATOR AND THAT THE RELEASE PIN WILL NOT COME OUT WHEN THE MASK(S) IS(ARE) PULLED.
     (a) Examine the foam pad(s) for correct installation (Ref. AMM TASK 35-21-42-400-001).
   (10) Put the oxygen masks into the emergency oxygen container (Ref. AMM TASK 35-21-43-550-801) and (Ref. AMM TASK 35-21-43-550-802).
   (11) Install the emergency oxygen container (Ref. AMM TASK 35-21-41-400-001).
   (12) Do steps 1 thru 11 again for each emergency-oxygen container.
Subtask 35-23-00-860-063-A
B. Aircraft Maintenance Configuration
   (1) On all emergency oxygen containers, do step (a) and/or step (b) as applicable:
     (a) Pull out the test button with your fingers. Then turn it 90 degrees to the TEST position.

     (b) Push the left side of the test button on the door assembly.
NOTE: The over-center spring keeps the lever of the test button at 90 degrees to the door surface. The lever of the test button must stay in this position until you set it manually back to the initial position.
Subtask 35-23-00-720-061-A ** ON A/C NOT FOR ALL
C. Functional Test of the Automatic Mask Release
CAUTION: DO NOT USE TOO MUCH FORCE TO CLOSE THE EMERGENCY OXYGEN CONTAINER. IF YOU USE TOO MUCH FORCE, YOU CAN CAUSE DAMAGE TO THE LATCH MECHANISM. IF THE LATCH MECHANISM DOES NOT ENGAGE EASILY, MAKE SURE THAT THE EQUIPMENT IN THE EMERGENCY OXYGEN CONTAINER IS CORRECTLY INSTALLED.
   (1) Do the test of the automatic mask release:
NOTE: The recorded announcements are usually recorded by the operator. You can hear the emergency announcement only if it is recorded.
ACTION
RESULT
1.On circuit breaker panel 49VU:

  • Open circuit breakers 2WR and 3WR.

2.On overhead panel 21VU:

  • Lift the switch guard and push and hold the MASK MAN ON pushbutton switch for a minimum of 30 seconds.
  • The SYS ON indicator light comes on.

In the cabin:

  • The doors of all the emergency oxygen containers open.

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.

On maintenance panel 50VU:

  • After approximately 30 seconds, the FAULT indicator light in the TMR RESET pushbutton switch comes on.
  • Release the MASK MAN ON pushbutton switch.
  • The FAULT indicator light in the TMR RESET pushbutton switch goes off.
3.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.
4.In the cabin, at the first seat row:

  • Push the doors of all emergency oxygen containers to the closed position.
  • Push the doors of all emergency oxygen containers, at the two sides of the test buttons, and lock the latch mechanism.
  • Make sure that the doors are flush with the adjacent panels.

5.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to 14800 ft. (4511 m).
  • The doors of all oxygen containers open at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.
  • Slowly increase the pressure to 0 ft. (0 m).

6.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on..

On overhead panel 21VU:

  • The SYS ON indicator light goes off.
7.At electronic rack 103VU:

  • Remove SWITCH OFF relay 9WR.

  • Install a wire between pins A2 and A3 of the relay socket.

8.In the cabin, at the first seat row:

  • Push the door of one emergency oxygen container to the closed position.
  • Push the door of the related emergency oxygen container, at the two sides of the test button, and lock the latch mechanism.
  • Make sure that the door is flush with the adjacent panels.

9.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to and hold it at 14800 ft. (4511 m) for not less than 30 seconds.
  • The door of the related oxygen container opens at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.
10.In the cabin, at the first seat row:

  • After approximately 30 seconds, push the door of the related emergency oxygen container to the closed position.
  • Push the door of the related emergency oxygen container, at the two sides of the test button, and lock the latch mechanism.
  • Make sure that the door is flush with the adjacent panels.
  • The door of the emergency oxygen container stays closed.
11.At the vacuum source:

  • Slowly increase the pressure to 0 ft. (0 m).

12.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.
13.At electronic rack 103VU:

  • Remove the wire from pin A2 and A3 of the relay socket.

  • Install SWITCH OFF relay 9WR.

  • Remove SWITCH OFF relay 8WR.

  • Install a wire between pins A2 and A3 of the relay socket.

14.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to and hold it at 14800 ft. (4511 m) for not less than 30 seconds.
  • The door of the related oxygen container opens at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded)..
NOTE: At the end of the emergency announcement it stops automatically.
15.In the cabin, at the first seat row:

  • After approximately 30 seconds, push the door of the related emergency oxygen container to the closed position.
  • Push the door of the related emergency oxygen container, at the two sides of the test button, and lock the latch mechanism.
  • Make sure that the door is flush with the adjacent panels.
  • The door of the emergency oxygen container stays closed.
16.At the vacuum source:

  • Slowly increase the pressure to 0 ft. (0 m).

17.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.
18.At electronic rack 103VU:

  • Remove the wire from pin A2 and A3 of the relay socket.

  • Install SWITCH OFF relay 8WR.

19.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to and hold it at 14800 ft. (4511 m) for not less than 30 seconds.
  • The door of the related oxygen container opens at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.
20.At the vacuum source:

  • Slowly increase the pressure to 0 ft. (0 m).

21.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.
22.On circuit breaker panel 49VU:

  • Close circuit breaker 2WR.

  • Open circuit breakers 5WR and 6WR.

23.In the cabin, at the first and second seat rows:

  • Push the doors of all related emergency oxygen containers to the closed position.
  • Push the doors of all related emergency oxygen containers, at the two sides of the test buttons, and lock the latch mechanisms.
  • Make sure that the doors are flush with the adjacent panels.

24.On overhead panel 21VU:

  • Push and hold the MASK MAN ON pushbutton switch for a minimum of 6 seconds.
  • The SYS ON indicator light comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.

In the cabin, at the first and second seat rows:

  • The doors of some of the emergency oxygen containers open immediately.

  • After approximately 6 seconds, the doors of all the other emergency oxygen containers open.
  • Release the MASK MAN ON pushbutton switch.

25.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.
26.In the cabin, at the first and second seat rows:

  • Push the doors of all related emergency oxygen containers to the closed position.
  • Push the doors of all related emergency oxygen containers, at the two sides of the test buttons, and lock the latch mechanism.
  • Make sure that the doors are flush with the adjacent panels.

27.On circuit breaker panel 49VU:

  • Open circuit breaker 2WR.

  • Close circuit breaker 3WR.

28.On overhead panel 21VU:

  • Push and hold the MASK MAN ON pushbutton switch for a minimum of 6 seconds.
  • The SYS ON indicator light comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.

In the cabin, at the first and second seat rows:

  • The doors of some of the emergency oxygen containers open immediately.

  • After approximately 6 seconds, the doors of all the other emergency oxygen containers open.
  • Release the MASK MAN ON pushbutton switch.

29.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • The ON indicator light in the TMR RESET pushbutton switch comes on while the pushbutton is pushed.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.
30.On circuit breaker panel 49VU:

  • Close circuit breakers 2WR, 5WR and 6WR.

Subtask 35-23-00-720-061-C ** ON A/C NOT FOR ALL
C. Functional Test of the Automatic Mask Release
CAUTION: DO NOT USE TOO MUCH FORCE TO CLOSE THE EMERGENCY OXYGEN CONTAINER. IF YOU USE TOO MUCH FORCE, YOU CAN CAUSE DAMAGE TO THE LATCH MECHANISM. IF THE LATCH MECHANISM DOES NOT ENGAGE EASILY, MAKE SURE THAT THE EQUIPMENT IN THE EMERGENCY OXYGEN CONTAINER IS CORRECTLY INSTALLED.
   (1) Do the test of the automatic mask release:
NOTE: The recorded announcements are usually recorded by the operator. You can hear the emergency announcement only if it is recorded.
ACTION
RESULT
1.On circuit breaker panel 49VU:

  • Open circuit breakers 2WR and 3WR.

2.On overhead panel 21VU:

  • Lift the switch guard and push and hold the MASK MAN ON pushbutton switch for a minimum of 30 seconds.
  • The SYS ON indicator light comes on.

On the Engine/Warning Display (EWD):
  • The OXY PAX ON indicator comes on.

In the cabin:

  • All the doors of the emergency oxygen containers open.

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.

On maintenance panel 50VU:

  • After approximately 30 seconds, the FAULT indicator light in the TMR RESET pushbutton switch comes on.
  • Release the MASK MAN ON pushbutton switch.
  • The FAULT indicator light in the TMR RESET pushbutton switch goes off.
3.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.

On the EWD:

  • The OXY PAX ON indicator goes off.
4.In the cabin, at the first seat row:
  • Push the doors of all related emergency oxygen containers to the closed position.
  • Push the doors of all related emergency oxygen containers, at the two sides of the test buttons, to lock the latch mechanisms.
  • Make sure that the doors are flush with the adjacent panels.

5.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to 14800 ft. (4511 m).
  • The doors of all oxygen containers open at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

On the EWD:

  • The OXY PAX ON indicator comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.
  • Slowly increase the pressure to 0 ft. (0 m).

6.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.

On the EWD:

  • The OXY PAX ON indicator goes off.
7.At electronic rack 103VU:

  • Remove SWITCH OFF relay 9WR.

  • Install a wire between pins A2 and A3 of the relay socket.

8.In the cabin, at the first seat row:
  • Push the door of one emergency oxygen container to the closed position.
  • Push the door of the related emergency oxygen container, at the two sides of the test button, to lock the latch mechanism.
  • Make sure that the door is flush with the adjacent panels.

9.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to 14800 ft. (4511 m) and hold it for not less than 30 seconds.
  • The door of the related oxygen container opens at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

On the EWD:

  • The OXY PAX ON indicator comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.
10.In the cabin, at the first seat row:
  • After approximately 30 seconds, push the door of the related emergency oxygen container to the closed position.
  • Push the door of the related emergency oxygen container, at the two sides of the test button, to lock the latch mechanism.
  • Make sure that the door is flush with the adjacent panels.

11.At the vacuum source:

  • Slowly increase the pressure to 0 ft. (0 m).

12.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.

On the EWD:

  • The OXY PAX ON indicator goes off.
13.At electronic rack 103VU:

  • Remove the wire from pins A2 and A3 of the relay socket.

  • Install SWITCH OFF relay 9WR.

  • Remove SWITCH OFF relay 8WR.

  • Install a wire between pins A2 and A3 of the relay socket.

14.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to 14800 ft. (4511 m) and hold it for not less than 30 seconds.
  • The door of the related oxygen container opens at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

On the EWD:

  • The OXY PAX ON indicator comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.
15.In the cabin, at the first seat row:
  • After approximately 30 seconds, push the door of the related emergency oxygen container to the closed position.
  • Push the door of the related emergency oxygen container, at the two sides of the test button, to lock the latch mechanism.
  • Make sure that the door is flush with the adjacent panels.

16.At the vacuum source:

  • Slowly increase the pressure to 0 ft. (0 m).

17.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.

On the EWD:

  • The OXY PAX ON indicator goes off.
18.At electronic rack 103VU:

  • Remove the wire from pins A2 and A3 of the relay socket.

  • Install SWITCH OFF relay 8WR.

19.At the vacuum source:
In the cabin, at the first seat row:
  • Slowly decrease the pressure to 14800 ft. (4511 m) and hold it for not less than 30 seconds.
  • The door of the related oxygen container opens at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m).

On overhead panel 21VU:

  • The SYS ON indicator light comes on.

On the EWD:

  • The OXY PAX ON indicator comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.
20.At the vacuum source:

  • Slowly increase the pressure to 0 ft. (0 m).

21.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.

On the EWD:

  • The OXY PAX ON indicator goes off.
22.On circuit breaker panel 49VU:

  • Close circuit breaker 2WR.

  • Open circuit breakers 5WR and 6WR.

23.In the cabin, at the first and second seat rows:
  • Push the doors of all related emergency oxygen containers to the closed position.
  • Push the doors of all related emergency oxygen containers, at the two sides of the test buttons, to lock the latch mechanisms.
  • Make sure that the doors are flush with the adjacent panels.

24.On overhead panel 21VU:

  • Push and hold the MASK MAN ON pushbutton switch for a minimum of 6 seconds.
  • The SYS ON indicator light comes on.

On the EWD:
  • The OXY PAX ON indicator comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.

In the cabin, at the first and second seat rows:

  • The doors of some of the emergency oxygen containers open immediately.

  • After approximately 6 seconds, the doors of all the other emergency oxygen containers open.
  • Release the MASK MAN ON pushbutton switch.

25.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.

On the EWD:

  • The OXY PAX ON indicator goes off.
26.In the cabin, at the first and second seat rows:
  • Push the doors of all related emergency oxygen containers to the closed position.
  • Push the doors of all related emergency oxygen containers, at the two sides of the test buttons, to lock the latch mechanisms.
  • Make sure that the doors are flush with the adjacent panels.

27.On circuit breaker panel 49VU:

  • Open circuit breaker 2WR.

  • Close circuit breaker 3WR.

28.On overhead panel 21VU:

  • Push and hold the MASK MAN ON pushbutton switch for a minimum of 6 seconds.
  • The SYS ON indicator light comes on.

On the EWD:
  • The OXY PAX ON indicator comes on.

In the cabin:

  • The emergency announcement starts (when it is recorded).
NOTE: At the end of the emergency announcement it stops automatically.

In the cabin, at the first and second seat rows:

  • The doors of some of the emergency oxygen containers open immediately.

  • After approximately 6 seconds, the doors of all the other emergency oxygen containers open.
  • Release the MASK MAN ON pushbutton switch.

29.On maintenance panel 50VU:

  • Push the TMR RESET pushbutton switch.
  • While you push the TMR RESET pushbutton, its ON indicator light comes on.

On overhead panel 21VU:

  • The SYS ON indicator light goes off.

On the EWD:

  • The OXY PAX ON indicator goes off.
30.On circuit breaker panel 49VU:

  • Close circuit breakers 2WR, 5WR and 6WR.

5. Close-up
Subtask 35-23-00-080-062-A
A. Disconnection of the Ground Pressure Equipment
F Installation and Removal of the Hose Adapter on the Altitude Switch
   (1) Disconnect the VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI) and the 98A35207599000 HOSE-ADAPTER,ALTITUDE SWITCH (2) from the altitude pressure switch 16WR (1).
Subtask 35-23-00-410-053-A
B. Close Access
   (1) Make sure that the switch guard is in position on the MASK MAN ON pushbutton switch.
   (2) Close the doors of all emergency oxygen containers:
CAUTION: DO NOT USE TOO MUCH FORCE TO CLOSE THE EMERGENCY OXYGEN CONTAINER. IF YOU USE TOO MUCH FORCE, YOU CAN CAUSE DAMAGE TO THE LATCH MECHANISM. IF THE LATCH MECHANISM DOES NOT ENGAGE EASILY, MAKE SURE THAT THE EQUIPMENT IN THE EMERGENCY OXYGEN CONTAINER IS CORRECTLY INSTALLED.
     (a) Push the doors of the emergency oxygen containers to the closed position.
     (b) Push the doors of the emergency oxygen containers, at the two sides of the test buttons, and lock the latch mechanisms.
     (c) Make sure that the latches engage correctly.
     (d) Make sure that the doors are flush with the adjacent panels.
     (e) Make sure that there is a clearance at each side of the emergency oxygen container doors.
     (f) Make sure that all the test buttons are in the normal position.
NOTE: Spring tension will retract the test buttons when they are in the normal position.
   (3) Make sure that the work area is clean and clear of tools and other items.
   (4) Close access doors 812 and 824.
Subtask 35-23-00-862-052-A
C. Put the aircraft back to its initial configuration.
   (1) In the cockpit, on the OXYGEN section of overhead panel 21VU:
     (a) Remove the WARNING NOTICE(S).
   (2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
   (3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
[Rev.10 from 2021] 2026.04.01 01:05:14 UTC
"Aviabrain" 2025