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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-087

 WARNING:_______ OPEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER SLOWLY.
 HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION WITH
 THE OXYGEN.  THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE

 AIRPLANE AND EQUIPMENT.
 (5)  
Open the shutoff valve on the portable test cylinder slowly, and start to pressurize the system to a value of 1750 through 1950 psig.

 S 865-088

 (6)  
Permit the system to cool down for 1 minute when the pressure reaches 500, 1000 and 1500 psig.

 S 865-089

 (7)  
Open the shutoff valves completely or until a point where resistance is felt.

 S 865-090
 CAUTION: DO NOT TIGHTEN 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 795-091

 (9)  
Make sure no leaks show over a period of 15 minutes on the 0-2000 psi pressure gauge.

 S 795-092

 (10)
 If gauge shows a pressure drop, do a check for leaks:

 WARNING: OPEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER
_______ SLOWLY. HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION WITH THE OXYGEN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (a)  
Start to open the shutoff valve on the portable test cylinder slowly, and pressurize the system to a value of 1750 through 1950 psig.

 (b)  
Permit the system to cool down for 1 minute when the pressure reaches 500, 1000 and 1500 psig.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (c)  
Open the shutoff valves on the portable test completely or to a point where resistance is felt.

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

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

 (f)  
Make sure there are no leaks and test again until the system is satisfactory.

 S 865-093
 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (11) Close the shutoff valve on the portable test cylinder.
 NOTE: The shutoff valve on the oxygen cylinder can be closed by
____
 hand which is equivalent to 25 pound-inches.

 S 085-201
 (12) Remove the portable test cylinder.
 WARNING: LOOSEN THE CONNECTIONS ON THE OXYGEN CYLINDER CAREFULLY.
_______ THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE AND CAUSE THE TEMPERATURE TO INCREASE. THIS CAN START AN IGNITION WITH THE OXYGEN AND CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (a)  
Slowly disconnect the portable test cylinder and the 0-2000 psi pressure gauge from the inlet line at point A.

 (b)  
Remove the cap from the inlet port of the flow control unit.

 S 425-202
 (13) Connect the inlet line to the flow control unit.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-21-00
 ALL  ú ú 01B Page 520 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-095
 WARNING:_______OPEN THE SHUTOFF VALVES ON THE OXYGEN CYLINDERS SLOWLY. HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION WITH THE OXYGEN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (14) Open the shutoff valves on the oxygen cylinders:
 (a) Slowly turn the shutoff valve until it is fully open.
　
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