(3) Remove the ceiling panel 231CC (Ref. TASK 25-23-41-000-001). Subtask 35-23-00-865-070
 D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WR, 2WR
 4. Procedure
_________
 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.

 Subtask 35-23-00-860-060
 A. Obey the special precautions when you do this task (Ref. TASK 35-00-00-860-001).
 Subtask 35-23-00-480-056
 B. Connect the altitude pressure switch 16WR to a vacuum source with the HOSE - ADAPTER, ALTITUDE SWITCH (98A35207599000).

 Subtask 35-23-00-720-057
 C. Functional Test of the Altitude Pressure Switch
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. At the vacuum source:
-Slowly increase the pressure to 14800 ft. (4500 m).
2. At the vacuum source:
 -Slowly decrease the pressure to 0 ft. (0 m).
 3. On the panel 50VU:
-Push the TMR RESET pushbutton switch.
4. At the oxygen test port 7504WR3:
-Put the TEST TOOL - MANUAL RELEASE on the oxygen test port 7504WR3 to release the pressure from the system.
 5. On the Forward Attendant Panel (FAP) 120RH:
-Push the PRE REC ANN. STOP pushbutton switch.
On the panel 21VU:
-
The SYS ON indicator light comes onat 14000 +0 -500 ft. (4260 +0 -150 m).

 In the cabin:

 -
The emergency announcement starts at 14000 +0 -500 ft. (4260 +0 -150 m).

 On all the emergency oxygen containers:

 -
The doors of the oxygen containers open and the oxygen masks come out.

On the panel 50VU:
-
The ON indicator light on the TMRRESET pushbutton switch comes on.

 On the panel 50VU, after 5 seconds:

 -
The ON indicator light on the TMR RESET pushbutton switch goes off.

On the panel 21VU:

-
The SYS ON indicator light goes off.

In the Cabin:

-
The emergency announcement stops.

 Subtask 35-23-00-210-056
 D. Detailed Inspection of the Oxygen Mask Assembly
 (1)
 Examine the oxygen masks:

 -
For cracks

 -
For color changes

 -
For dirt.

 (2)
 Examine the flexible supply hoses:

 -
For correct attachment to the reservoir bag and the distribution/regulation unit

 -
For kinks

 -
For color changes.

 (3)
 Examine the reservoir bags:

 -
For correct connection to the mask and the supply hoses

 -
For tears

 -That you can read the inscription.

 (4)
 Examine the elastic head band:

 -
For over extension

 -
For elasticity

 -
For correct attachment to the mask.

 (5)
 Give the lanyard to mask connection a strong, short pull to make sure that the connection is satisfactory.

 Subtask 35-23-00-080-056
 E. Disconnect the vacuum source
 (1) Disconnect the vacuum source and the HOSE - ADAPTER, ALTITUDE SWITCH from the altitude pressure switch 16WR.
 5. Close-up
________
 Subtask 35-23-00-614-053
 A. If necessary, fill the emergency oxygen cylinders (Ref. TASK 35-21-00-614-001).

 Subtask 35-23-00-550-051
 B. Put the aircraft back to its initial configuration.
 (1) Install the oxygen masks in the emergency oxygen containers (Ref. TASK 35-23-00-550-001)
 NOTE : There must be a clearance at each side of the emergency oxygen
____
 container doors.

 NOTE : The latches must engage correctly.
____
 (2) Make sure that all door stops are in the normal position. NOTE : Spring tension retracts the door stops automatically when they
____
 are in the normal position.

 Subtask 35-23-00-865-071
 C. Open, safety and tag this(these) circuit breaker(s):
 1WR, 2WR

 Subtask 35-23-00-410-063
 D. Close Access
 (1)
 Install the ceiling panel 231CC (Ref. TASK 25-23-41-400-001).

 (2)
 Install the altitude pressure switch 16WR (Ref. TASK 35-23-15-400-001)