(2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 35-00-00/201, Oxygen

 (4)  
WDM 35-11-11, 35-11-12, 35-11-13

 (5)  
SSM 35-11-01

 E. Access
 (1)  Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 221 Control Cabin, Left 222 Control Cabin, Right
 F. Preconditions
 S 865-255
 (1)  
Electrical Power (AMM 24-22-00/201).

 S 865-256

 (2)  
Airplane must be in the ground mode (AMM 32-09-02/201).

 S 865-257

 (3)
Crew Oxygen System in serviceable condition (AMM 35-21-00/501).

 G. Procedure
 S 915-189
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 (2)  
Make sure the airplane is electrically grounded (AMM 20-41-01/201).

 (3)  
Open the access door to the crew oxygen cylinder.

 S 865-061
 S 865-110
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-035
 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH CREW OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (4)  Close the shutoff valve on each crew oxygen cylinder slowly.
 NOTE: Some airplanes have an optional second crew oxygen cylinder.
____
 NOTE: The shutoff valve can be tightened by hand which is
____
 equivalent to 25 pound-inches.

 S 865-036
 WARNING:_______LOOSEN THE SUPPLY LINE CONNECTIONS CAREFULLY. THE REMAINING OXYGEN CAN BE AS HIGH AS 1850 PSI AND CAN RELEASE WITH A LARGE FORCE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (5)  
Slowly disconnect one of the supply lines from a pressure reducer outlet (point A, Fig. 501).

 S 025-271

 (6)  
Do the steps that follow:

 (a)  
Put a cap on the pressure reducer outlet to prevent
 contamination of the system.

 (b)  
Use a high-pressure hose and tee fitting to connect the portable test cylinder and a pressure gage (0-2000 psi) to the medium pressure line.

 S 865-063
 WARNING:_______OPEN THE SHUTOFF VALVE ON THE OXYGEN CYLINDER SLOWLY. THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (7)  Open the shutoff valve on the portable test cylinder slowly and pressurize the system between 1700 and 1800 psig.
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 ALL  ú ú 06 Page 512 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-043
 CAUTION: DO NOT TORQUE THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER
_______ MORE THAN 25 POUND INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (8)  
After the system has become stable, close the shutoff valve on the portable test cylinder.

 S 785-044

 (9)  
Make sure the pressure does not decrease at a rate more than 15 psig per hour on the 0-2000 psi pressure gage.

 NOTE: Monitor the leakage rate for at least 30 minutes.
____
 S 795-045
 (10) If the gage shows an unacceptable pressure decrease, do a check for leaks as follows:
 WARNING: OPEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER
_______ SLOWLY. THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE WHICH CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (a)  
Open the shutoff valve on the portable test cylinder.

 (b)  
Do a check of all the connections for leaks with the leak detection compound.

 (c)  
Rub the leak detection compound off with a clean cotton cloth immediately after you do the check.
　
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