S 735-082

 (10)
 Do the task: "Crew Oxygen Pressure Reducer and Pressure Regulator test" for the pressure reducer on the other crew oxygen cylinder if installed.

 H. Put the System Back in its Initial Condition
 S 865-151
 WARNING:_______OPEN THE SHUTOFF VALVE ON THE CREW 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.
 (1)  Slowly open the shutoff valve on each crew oxygen cylinder as follows:
 (a) Slowly turn the shutoff valve until it is fully open.
 NOTE: But, do not torque the shutoff valve more than 25
____ pound-inches. This is equivalent to a torque which is tightened by your fingers.
 (b)  
Close the shutoff valve one-fourth of a turn.

 (c)  
Install a lockwire on the shutoff valve.

 NOTE: Use the 0.020 inch diameter copper lockwire
____
 (AMM 20-11-28/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-11-00
 ALL  ú ú 01 Page 520 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 795-137
 (2)  
Do a check of the conncections for leaks (Point A, Fig. 501) with the leak detection compound.

 S 035-178

 (3)  
Rub the leak detection compound off with a clean cotton cloth immediately after you do the check.

 S 865-143

 (4)  
Close the access door to the crew oxygen cylinder.

 S 865-064

 (5)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 I. Do a Test of the Pressure Regulator
 S 865-065
 (1)  
Supply the electrical power (AMM 24-22-00/201).

 S 015-092

 (2)  
Remove the closure assembly in the right coat closet to get to the pressure regulator.

 S 865-115

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

 S 865-067
 CAUTION: DO NOT TORQUE THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (4)  Close the shutoff valve on the crew oxygen cylinder(s).
 NOTE: The shutoff valve can be closed by your hand which is
____
 equivalent to 25 pound-inches.

 S 865-094
 (5)  
Slowly disconnect the outlet line on the pressure regulator, and put a cap the outlet line.

 S 485-095

 (6)  
Connect the 0-150 psi pressure gage to the pressure regulator outlet.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-11-00
 ALL  ú ú 01 Page 521 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-096
 WARNING:_______OPEN THE SHUTOFF VALVE ON THE CREW 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)  Slowly open the shutoff valve on each crew oxygen cylinder as follows:
 NOTE: Some airplanes have an optional second crew oxygen cylinder.
____
 (a)  
Slowly turn the shutoff valve until it is fully open. NOTE: But, do not torque the shutoff valve more than 25

____ pound-inches. This is equivalent to a torque which is tighten by your fingers.

 (b)
Close the shutoff valve one-fourth of a turn. S 785-098

 (8) Make sure the 0-150 psi pressure gage is between 60 and 85 psig.
 J.  Put the System Back to its Initial Condition
 S 865-144 CAUTION: DO NOT TORQUE THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (1)  Close the shutoff valve on the crew oxygen cylinder.
 NOTE: The shutoff valve can be closed by hand which is

____
 equivalent to 25 pound-inches.

 S 085-099
 (2)  
Slowly disconnect the 0-150 psi pressure gage and permit the system to bleed down.
　
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