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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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