(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)
