Check of the AUTO control function of the MASK MAN ON pushbutton

TASK 35-23-00-040-008-A
Check of the AUTO control function of the MASK MAN ON pushbutton

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: 120
ZONE: 200
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	NO	YES	2.0	2.0	2

1. Reason for the Job
MMEL 35-01-01-31A
MANUAL CONTROL OF THE MASK MAN ON PB
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	LABEL - ADHESIVE, INOP
No specific	1	VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI)
98A35207599000	1	HOSE-ADAPTER,ALTITUDE SWITCH

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
200	UPPER HALF FUSELAGE
812, 824

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 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access

3. Job Set-up
Subtask 35-23-00-860-073-A ** ON A/C NOT FOR ALL

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 overhead panel 21VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to operate the emergency oxygen system.
(4) On all the emergency oxygen containers:
(a) Push the test buttons to the test position.

Subtask 35-23-00-860-073-B ** ON A/C NOT FOR ALL

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 overhead panel 21VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to operate the emergency oxygen system.
(4) Energize the CIDS system (Ref. AMM TASK 23-73-00-861-001).
(5) On all the emergency oxygen containers:
(a) Push the test buttons to the test position.

Subtask 35-23-00-010-075-A ** ON A/C NOT FOR ALL

B. Get Access to the Avionics Compartment
(1) Open the access doors 812 and 824 (Ref. AMM TASK 52-41-00-010-002).

Subtask 35-23-00-865-088-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	OXYGEN/PASSENGER/ACTUATION	7WR	HA08
49VU	OXYGEN/PASSENGER/ACTUATION	6WR	HA07
49VU	OXYGEN/PASSENGER/ACTUATION	5WR	HA06
49VU	OXYGEN/PASSENGER/ACTUATION	4WR	HA05
49VU	OXYGEN/PASSENGER/CTL AND WARN	3WR	HA04
49VU	OXYGEN/PASSENGER/CTL AND WARN	2WR	HA03
49VU	OXYGEN/PASSENGER/CTL AND WARN	1WR	HA02
** ON A/C NOT FOR ALL
2000VU	PRAM	2RX	E01

Subtask 35-23-00-480-060-A ** ON A/C NOT FOR ALL

D. Connecting of the Vacuum Source
(1) Connect the VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI) to the altitude pressure switch 16WR with the 98A35207599000 HOSE-ADAPTER,ALTITUDE SWITCH.

4. Procedure
Subtask 35-23-00-040-051-A ** ON A/C NOT FOR ALL

A. Functional Test of the Automatic Mask Release
(1) Do the test:

ACTION	RESULT
1.On the circuit breaker panel 49VU:
Open the circuit breakers 2WR and 3WR.
2.At the vacuum source:	In the cabin:
Slowly decrease the pressure to 14800 ft. (4500 m).	The doors of all oxygen containers open at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m) to the maximum permitted by the test buttons.
	On the overhead panel 21VU:
	The SYS ON indicator light comes on.
Slowly increase the pressure to 0 ft. (0 m).
3.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
4.At the electronic rack 103VU:
Remove the SWITCH OFF relay 9WR.
Install a wire between pin A2 and A3 of the relay socket.
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. 5.In the cabin, at the first seat row, close the door of the emergency oxygen container:
Push the door of one emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.
6.At the vacuum source:	In the cabin, at the first seatrow:
Slowly decrease the pressure to 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
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. 7.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seat row:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
8.At the vacuum source:
Slowly increase the pressure to 0 ft. (0 m).
9.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
10.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 9WR.
Remove the SWITCH OFF relay 8WR.
Install a wire between pin A2 and A3 of the relay socket.
11.At the vacuum source:	In the cabin, at the first seatrow:
Slowly decrease the pressure to 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
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. 12.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seatrow:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of thetest button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
13.At the vacuum source:
Slowly increase the pressure to 0 ft. (0 m).
14.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
15.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 8WR.
16.At the vacuum source:	In the cabin, at the first seatrow:
Slowly decrease the pressure to and hold it at 14800 ft. (4500 m) for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
17.At the vacuum source:
Slowly increase the pressure to 0 ft. (0 m).
18.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
19.On the circuit breaker panel 49VU:
Close the circuit breakers 2WR and 3WR.

Subtask 35-23-00-040-051-D ** ON A/C NOT FOR ALL

A. Functional Test of the Automatic Mask Release

NOTE: The pre-recorded announcement is usually recorded by the operator.
You can hear the emergency announcement only if it is recorded.

(1) Do the test

ACTION	RESULT
1.On the circuit breaker panel 49VU:
Open the circuit breakers 2WR and 3WR.
2.At the vacuum source:	In the cabin:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m).	The doors of all oxygen containers open at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m) to the maximum permitted by the test buttons.
	The emergency announcement starts. NOTE: The emergency announcement stops automatically when the recorded announcement is completed.
	On the overhead panel 21VU:
	The SYS ON indicator light comes on.
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
3.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
4.At the electronic rack 103VU:
Remove the SWITCH OFF relay 9WR.
Install a wire between pin A2 and A3 of the relay socket.
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. 5.In the cabin, at the first seat row, close the door of the emergency oxygen container:
Push the door of one emergency oxygen container to the closed position. Push the door of the emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.
6.At the vacuum source:	In the cabin, at the first seat row:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
	In the cabin:
	The emergency announcement starts. NOTE: The emergency announcement stops automatically when the recorded announcenment is completed.
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. 7.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seat row:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
8.At the vacuum source:
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
9.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
10.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 9WR.
Remove the SWITCH OFF relay 8WR.
Install a wire between pin A2 and A3 of the relay socket.
11.At the vacuum source:	In the cabin, at the first seat row:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
	In the cabin:
	The emergency announcement starts. NOTE: The emergency announcement stops automatically when the recorded announcement is completed.
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. 12.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seat row:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
13.At the vacuum source:
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
14.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
15.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 8WR.
16.At the vacuum source:	In the cabin, at the first seat row:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
	In the cabin:
	The emergency announcement starts. NOTE: The emergency announcement stops automatically when the recorded announcement is completed.
17.At the vacuum source:
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
18.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
19.On the circuit breaker panel 49VU:
Close the circuit breakers 2WR and 3WR.

Subtask 35-23-00-040-051-J ** ON A/C NOT FOR ALL

A. Functional Test of the Automatic Mask Release
(1) Do the test:

ACTION	RESULT
1.On the circuit breaker panel 49VU:
Open the circuit breakers 2WR and 3WR.
2.At the vacuum source:	In the cabin:
Slowly decrease the pressure to 14800 ft. (4500 m).	The doors of all oxygen containers open at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m) to the maximum permitted by the test buttons.
	On the overhead panel 21VU:
	The SYS ON indicator light comes on.
	On the Engine/Warning Display (EWD):
	The OXY PAX ON indication comes on.
Slowly increase the pressure to 0 ft. (0 m).
3.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
4.At the electronic rack 103VU:
Remove the SWITCH OFF relay 9WR.
Install a wire between pin A2 and A3 of the relay socket.
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. 5.In the cabin, at the first seat row, close the door of the emergency oxygen container:
Push the door of one emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.
6.At the vacuum source:	In the cabin, at the first seatrow:
Slowly decrease the pressure to 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
	On the EWD:
	The OXY PAX ON indicator comes on.
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. 7.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seat row:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
8.At the vacuum source:
Slowly increase the pressure to 0 ft. (0 m).
9.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
10.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 9WR.
Remove the SWITCH OFF relay 8WR.
Install a wire between pin A2 and A3 of the relay socket.
11.At the vacuum source:	In the cabin, at the first seatrow:
Slowly decrease the pressure to 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
	On the EWD:
	The OXY PAX ON indicator comes on.
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. 12.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seatrow:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of thetest button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
13.At the vacuum source:
Slowly increase the pressure to 0 ft. (0 m).
14.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
15.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 8WR.
16.At the vacuum source:	In the cabin, at the first seatrow:
Slowly decrease the pressure to and hold it at 14800 ft. (4500 m) for not less than 30 sec.	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 the overhead panel 21VU:
	The SYS ON indicator light comes on.
	On the EWD:
	The OXY PAX ON indicator comes on.
17.At the vacuum source:
Slowly increase the pressure to 0 ft. (0 m).
18.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
19.On the circuit breaker panel 49VU:
Close the circuit breakers 2WR and 3WR.

Subtask 35-23-00-040-051-L ** ON A/C NOT FOR ALL

A. Functional Test of the Automatic Mask Release

NOTE: The pre-recorded announcement is usually recorded by the operator.
You can hear the emergency announcement only if it is recorded.

(1) Do the test

ACTION	RESULT
1.On the circuit breaker panel 49VU:
Open the circuit breakers 2WR and 3WR.
2.At the vacuum source:	In the cabin:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m).	The doors of all oxygen containers open at 14000 +250 ft. or -750 ft. (4267.12 +76.20 m or -228.60 m) to the maximum permitted by the test buttons.
	The emergency announcement starts. NOTE: The emergency announcement stops automatically when the recorded announcement is completed.
	On the overhead panel 21VU:
	The SYS ON indicator light comes on.
	On the Engine/Warning Dispaly (EWD):
	The OXY PAX ON indicator comes on.
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
3.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
4.At the electronic rack 103VU:
Remove the SWITCH OFF relay 9WR.
Install a wire between pin A2 and A3 of the relay socket.
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. 5.In the cabin, at the first seat row, close the door of the emergency oxygen container:
Push the door of one emergency oxygen container to the closed position. Push the door of the emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.
6.At the vacuum source:	In the cabin, at the first seat row:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the 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. NOTE: The emergency announcement stops automatically when the recorded announcenment is completed.
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. 7.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seat row:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
8.At the vacuum source:
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
9.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
10.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 9WR.
Remove the SWITCH OFF relay 8WR.
Install a wire between pin A2 and A3 of the relay socket.
11.At the vacuum source:	In the cabin, at the first seat row:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the 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. NOTE: The emergency announcement stops automatically when the recorded announcement is completed.
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. 12.In the cabin, at the first seat row, close the door of the emergency oxygen container:	In the cabin, at the first seat row:
After approximately 30 sec., push the door of the related emergency oxygen container to the closed position. Push the door of the related emergency oxygen container, at both sides of the test button, to lock the latch mechanism. Make sure that the door is flush with the adjacent panels.	The door of the emergency oxygen container stays closed.
13.At the vacuum source:
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
14.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
15.At the electronic rack 103VU:
Remove the wire from pin A2 and A3 of the relay socket.
Install the SWITCH OFF relay 8WR.
16.At the vacuum source:	In the cabin, at the first seat row:
Slowly decrease the pressure to simulate an altitude of 14800 ft. (4500 m) and hold it for not less than 30 sec.	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 the 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. NOTE: The emergency announcement stops automatically when the recorded announcement is completed.
17.At the vacuum source:
Slowly increase the pressure to simulate an altitude of 0 ft. (0 m).
18.On the maintenance panel 50VU:	On the 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 the overhead panel 21VU:
	The SYS ON indicator light goes off.
	On the EWD:
	The OXY PAX ON indicator goes off.
19.On the circuit breaker panel 49VU:
Close the circuit breakers 2WR and 3WR.

5. Close-up
Subtask 35-23-00-080-060-A ** ON A/C NOT FOR ALL

A. Disconnecting of the Vacuum Source
(1) Disconnect the VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI) and the 98A35207599000 HOSE-ADAPTER,ALTITUDE SWITCH from the altitude pressure switch 16WR.

Subtask 35-23-00-410-074-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the switch guard is in position on the MASK MAN ON pushbutton switch.
(2) If not installed, install a LABEL - ADHESIVE, INOP:
(a) On the overhead panel, on the control panel 21VU, install the LABEL - ADHESIVE, INOP adjacent to the MASK MAN ON P/BSW 14WR.
(3) On all emergency oxygen containers:
(a) Close the doors of the 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.

1 Push the door of the emergency oxygen containers to the closed position.
2 Push the door of the emergency oxygen containers, at both sides of the test button, to lock the latch mechanism.
3 Make sure that the doors are flush with the adjacent panels.
4 Do step (b) and/or step (c) as applicable.
(b) Turn the test buttons 90 degrees to normal position.
(c) Push the test buttons back to the normal position and let them retract into their containers.

NOTE: Spring tension retracts the test buttons when they are in the normal position.

(4) Make sure that the work area is clean and clear of tools and other items.
(5) Close the access doors 812 and 824 (Ref. AMM TASK 52-41-00-410-002).
(6) Make an applicable entry in the logbook.

Subtask 35-23-00-860-078-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance 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).

[Rev.10 from 2021] 2026.04.01 01:05:10 UTC