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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E.  Preconditions S 865-258
 (1)  
Electrical Power (AMM 24-22-00/201).
 S 865-259

 (2)  
Airplane must be in the ground mode (AMM 32-09-02/201).
 S 865-260

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

 F.  Prepare to Do the Test S 925-244
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 865-070

 (2)  
Make sure the airplane is electrically grounded (AMM 20-41-01/201). S 865-245

 (3)  
Supply the electrical power (AMM 24-22-00/201).
 S 865-122

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

 S 865-147 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.
 (5)  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 closed by hand which is

____
 equivalent to 25 pound-inches.

 G.  Do a Test of the Pressure Reducer
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747-400 MAINTENANCE MANUAL
 S 865-149
 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.
 (1)  
Slowly disconnect the supply line from the pressure reducer outlet (Point A, Fig. 501).

 S 485-064

 (2)  
Connect the 0-2000 psi pressure gage to the pressure reducer outlet (Point A, Fig. 501) with a clean, high-pressure flexible hose.

 S 865-242
 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.
 (3)  
Open the shutoff valve on the oxygen cylinder.

 S 785-243

 (4)  
Pressurize the line to minimum of 1500 psig.

 S 865-128
 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.
 (5)  
After system has become stable, close the shutoff valve on the oxygen cylinder.

 S 785-129

 (6)  
Make sure the pressure on the 0-2000 psi pressure gage is between 600 and 830 psig.

 NOTE: This pressure is the lock up pressure which occurs when
____ the downstream oxygen lines are closed off.
 S 865-130
 CAUTION: DO NOT TORQUE THE SHUTOFF VALVE ON THE OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (7)  Close the shutoff valve on the oxygen cylinder.
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747-400 MAINTENANCE MANUAL
 S 085-150
 (8)  
Slowly disconnect the 0-2000 psi pressure gage and the flexible hose from the pressure reducer outlet (Point A, Fig. 501).

 S 865-134

 (9)  
Connect the supply line to the pressure reducer outlet.
　
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