S 144-028
(11)
Rub off the leak detection compound with a clean cotton cloth.
S 414-019
(12)
Close the cylinder access door.
(13)
Remove the electrical power if is not necessary (AMM 24-22-00/201).
S 864-020
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A
747-400 MAINTENANCE MANUAL
PRESSURE REDUCER - REMOVAL/INSTALLATION
_______________________________________
1. General_______
A. These tasks are included in this procedure:
(1)
Removal of the pressure reducer and the coupling assembly.
(2)
Installation of the pressure reducer and the coupling assembly.
B. The pressure reducer is installed on the coupling assembly which is connected to the outlet port of the crew oxygen cylinder in the forward cargo compartment (Fig. 401). The cylinder coupling assembly also includes the pressure transducer and a thermal compensator which are removed and installed with the coupling assembly. Access to the pressure reducer and cylinder coupling assembly is through the cylinder access door.
TASK 35-11-04-004-001
2. Pressure Reducer Removal (Fig. 401)________________________
A. Standard Tools and Equipment
(1) Caps and Plugs - Package of Clean, Protective
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
IPC 35-11-04
(3)
SSM 35-11-01
(4)
WDM 35-11-13
C. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
D. Procedure
S 914-029
(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
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE A
LINE SUPPLY CYLIDERS CREW OXYGEN
SUPPLY RETAINING NUT BULKHEAD FITTING REDUCER PRESSURE LINE B-NUT CLAMP SUPPORT
COUPLING NUT
SUPPLY LINE B-NUT
ACCESS DOOR CYLINDER PRESSURE TRANSDUCER RETAINING NUT BULKHEAD FITTING REDUCER PRESSURE PRESSURE TRANSDUCER ASSEMBLY COUPLING
SUPPORT CLAMP SHUTOFF VALVE CYLINDER FWD
A
Figure 401 Pressure Reducer Installation
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747-400
MAINTENANCE MANUAL
S 014-003
(3) Open the cylinder access door.
S 864-030
CAUTION: DO NOT TIGHTEN 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 each crew oxygen cylinder slowly.
NOTE: Some airplanes have an optional second oxygen cylinder.
____
NOTE: The shutoff valve can be closed by hand which is
____
equivalent to 25 pound-inches.
S 034-006
(5)
Disconnect the electrical connector from the pressure transducer.
S 034-008
(6)
Remove the coupling assembly:
WARNING: LOOSEN THE COUPLING NUT BETWEEN THE CREW OXYGEN CYLINDER
_______ AND THE COUPLING ASSEMBLY CAREFULLY. IF NOT, 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.
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