(2)
Listen for a release of air at each bleed relief valve.
S 865-008
(3)
Decrease the pressure to 15 psig and permit the system to become stable.
S 725-009
(4)
Listen for the release of air at each bleed relief valve to make sure no more air comes out.
S 725-007
I. Return the System to its usual state
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A
747-400 MAINTENANCE MANUAL
S 865-010
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.
(1) Close the shutoff valve on the portable test cylinder.
S 085-011
(2) Remove the test equipment.
(a) Disconnect the portable test cylinder from the test adapter.
(b) Disconnect the ME65B50263-3 pressure gage from the other test
adapter.
S 865-015
(3) Push a 1/4-inch Allen wrench or metal rod through the release access
hole to reset the latches.
S 415-018
(4) Close the oxygen box doors.
S 865-012
(5) Remove the devices that hold the oxygen box doors close.
S 865-024
WARNING:_______OPEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER SLOWLY. IF NOT, 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.
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(6) Open the shutoff valve on each oxygen cylinder:
(a) Slowly turn the shutoff valve until it is fully open.
NOTE: The shutoff valve can be closed by hand which is
____ equivalent to 25 pound-inches.
(b)
Close the shutoff valve one-fourth of a turn.
(c)
Install a lockwire on the shutoff valve.
S 415-025
(7) Close the access panels to the oxygen cylinders.
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A
747-400 MAINTENANCE MANUAL
VOLTAGE AVERAGING UNIT - REMOVAL/INSTALLATION
_____________________________________________
1. General_______
A. These tasks are included in this procedure:
(1)
Removal of the voltage averaging unit
(2)
Installation of the voltage averaging unit.
B. The voltage averaging unit is installed in the right side of the ceiling beam in the forward cargo compartment. It is also aft of the cargo door at approximately STA 740 (Fig. 401). Access to the voltage averaging unit is through the access panels to the oxygen cylinders.
TASK 35-21-10-004-001
2. Voltage Averaging Unit Removal (Fig. 401)______________________________
A. References
(1)
AMM 35-00-00/201, Oxygen
(2)
IPC 35-21-10
(3)
SSM 35-11-01
(4)
WDM 35-11-13
B. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
C. Procedure
S 914-014
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 864-002
(2)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
(3)
Open the access panel to the oxygen cylinders.
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