all the system connections that follow: a) The system connections from the external pressure source to the system shutoff valve.
(b)
If the 0-150 psi gage shows a pressure drop, do these steps: 1) Open the shutoff valve of the external pressure source. 2) Open the system shutoff valve. 3) With the leak detection compound, do a check of all the
system connections that follow: a) Examine all the connections from the system shutoff valve to each of the crew stations.
(c)
Stop the leaks and do the leak check again until there are no more leaks.
(d)
Close the shutoff valve of the external pressure source.
G. Put the Airplane Back to Its Usual Condition.
S 035-013
(1)
Open the shutoff valve of the crew oxygen system in the control cabin.
S 875-014
(2)
Bleed the system pressure.
(a)
Close the shutoff valve of the crew oxygen cylinder.
(b)
Make sure the shutoff valve of the crew oxygen system in the control cabin is open.
(c)
On the captain's mask stowage box, push the sliding control in the direction of the arrow and hold.
(d)
On the captain's mask/regulator, do the steps that follow: 1) Move the dilution control to 100%. 2) Push the emergency control knob and hold. 3) Monitor the flow blinker and make sure it changes from a
yellow color and then to a black color. 4) Release the sliding control and the emergency control knob.
S 085-015
(3)
Remove the 0 - 150 psi pressure gage.
(4)
Connect the first observer's mask/regulator to the supply line.
S 435-093
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35-12-00
ALL ú ú 01 Page 505 ú Mar 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 085-125
CAUTION:_______DO NOT USE THE COUPLING BODY AS A LEVER. USE A WRENCH ON THE COUPLING HEX NUT, OR DAMAGE TO COUPLING CAN OCCUR.
(5)
Disconnect the external pressure source.
S 035-095
(6)
Disconnect the 0 - 2000 psi gage from the cylinder coupling.
S 425-018
(7)
Install a plug on the cylinder coupling.
S 435-019
(8)
Tighten the plug to a torque of 170 pound-inches.
S 865-126
WARNING: YOU MUST OPEN THE SHUTOFF VALVE SLOWLY, OR HIGH
_______ TEMPERATURES CAN OCCUR. THIS CAN START AN IGNITION WITH THE OXYGEN AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND THE EQUIPMENT.
(9)
Slowly and carefully open the shutoff valve of the crew oxygen cylinder.
S 795-023
(10)
Do a simplified leak test of the plug connection at the cylinder coupling.
S 795-024
(11)
Do a simplified leakage test at the first observer's mask/regulator connection.
S 795-028
(12)
If there is leakage at the plug connection, do these steps:
(a) Bleed the system pressure again. 1) Close the shutoff valve on the crew oxygen cylinder. 2) Make sure the shutoff valve of the crew oxygen system in
the control cabin is open. 3) On the captain's mask stowage box, push the sliding control in the direction of the arrow and hold.
4) On the captain's mask/regulator, do the steps that follow: a) Move the dilution control to 100%. b) Push the emergency control knob and hold. c) Monitor the flow blinker and make sure it changes from
a yellow color and then to a black color. 5) Release the sliding control and the emergency control knob.
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