Operational Check of Manual Mask Release

TASK 35-23-00-710-001-A
Operational Check of Manual Mask Release

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: 352000-01
OPERATIONAL CHECK OF MANUAL MASK RELEASE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

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
Check of Manual Mask Release

3. Job Set-up
Subtask 35-23-00-860-091-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) Make sure that the CIDS system is energized (Ref. AMM TASK 23-73-00-861-001).
(4) In the cockpit, on the OXYGEN section of overhead panel 21VU, put a WARNING NOTICE(S) in position to tell persons not to operate the emergency oxygen system.

Subtask 35-23-00-010-054-A

B. Get Access
(1) On all emergency oxygen containers, do step (a) 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.

(2) Make sure that the lever of the test button stays at 90 degrees until you set it to the initial position at the end of the test.

Subtask 35-23-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C 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

4. Procedure
Subtask 35-23-00-710-060-A ** ON A/C NOT FOR ALL

A. Operational Test of the Passenger Emergency Oxygen System
(1) Do the test of the passenger emergency oxygen system:

NOTE: If you hold the MASK MAN ON pushbutton switch for more than 30 seconds, the FAULT indication light in the TMR RESET pushbutton switch comes on.

NOTE: Usually the operator records the prerecorded announcements.
You can hear the emergency announcement only if it is recorded.

ACTION	RESULT
1.On overhead panel 21VU:	On overhead panel 21VU:
Lift the switch guard, push and hold the MASK MAN ON pushbutton switch for a minimum of 2 seconds.	The SYS ON indicator light comes on.
	In the cabin:
	The doors of all emergency oxygen containers open to the maximum permitted by the test buttons.
	The emergency announcement starts (when it is recorded). NOTE: At the end of the emergency announcement, it stops automatically.
2.On maintenance panel 50VU:	On maintenance panel 50VU:
Push the TMR RESET pushbutton switch.	The ON indicator light on the TMR RESET pushbutton switch comes on while the pushbutton is pushed.
	On panel 21VU: The SYS ON indicator light goes off.

Subtask 35-23-00-710-060-B ** ON A/C NOT FOR ALL

A. Operational Test of the Passenger Emergency Oxygen System
(1) Do the test of the passenger emergency-oxygen system:

NOTE: If you hold the MASK MAN ON pushbutton switch for more than 30 seconds, the FAULT indication light in the TMR RESET pushbutton switch comes on.

NOTE: Usually the operator records the prerecorded announcements.
You can hear the emergency announcement only if it is recorded.

ACTION	RESULT
1.On overhead panel 21VU:	On overhead panel 21VU:
Lift the switch guard, push and hold the MASK MAN ON pushbutton switch for a minimum of 2 seconds.	The SYS ON indicator light comes on.
	On the Engine/Warning Display (EWD): The OXY PAX ON indicator comes on.
	In the cabin:
	The doors of all emergency oxygen containers open to the maximum permitted by the test buttons.
	The emergency announcement starts (when it is recorded). NOTE: At the end of the emergency announcement, it stops automatically.
2.On maintenance panel 50VU:	On maintenance panel 50VU:
Push the TMR RESET pushbutton switch.	The ON indicator light on the TMR RESET pushbutton switch comes on while the pushbutton is pushed.
	On panel 21VU: The SYS ON indicator light goes off.
	On the EWD: The OXY PAX ON indicator goes off.

5. Close-up
Subtask 35-23-00-410-055-A

A. Close Access
(1) On all emergency oxygen containers:
(a) Close the door of the emergency oxygen container:

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 container to the closed position.
2 Push the door of the emergency oxygen container, at the two sides of the test button, to lock the latch mechanism.
3 Make sure that the door is flush with the adjacent panels.
4 Do step a_ or step b_ as applicable.
a Turn the test button 90 degrees to the normal position.

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

b Push the test button back to the normal position and let them retract into their containers.

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

(2) In the cockpit, on the OXYGEN section of overhead panel 21VU, make sure that the switch guard is in position on the MASK MAN ON pushbutton switch.
(3) Make sure that the work area is clean and clear of tools and other items.

Subtask 35-23-00-862-053-A

B. 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).

[Rev.10 from 2021] 2026.04.01 01:05:12 UTC