S 864-013
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND

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A
747-400 MAINTENANCE MANUAL
 S 864-026
 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.
 (8)  
Open the shutoff valve on each oxygen cylinder:

 S 794-016

 (9)  
Do a Check the pressure transducer connection for leaks with the leak detection compound.

 S 144-024

 (10)
 Wipe off all leak detection compound with a clean cotton cloth.

 S 784-017

 (11)
 Do the procedure: Do the Pressure Indication Test, in the task: Oxygen Operational Test (AMM 35-21-00/501).

 S 414-028

 (12)
 Close all the access panels to the oxygen cylinders.

 S 864-020

 (13)
 Remove electrical power if it not necessary (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 PRESSURE REDUCER - REMOVAL/INSTALLATION
_______________________________________
 1.  General_______
 A.  These tasks are included in this proedure:
 (1)  
Removal of the pressure reducer and the coupling assembly

 (2)  
Installation of the pressure reducer and the coupling assembly.

 B.  The removal and installation procedures is for one pressure reducer. To do this proedure for a second pressure reducer do the same steps again.
 C.  A pressure reducer is installed on each coupling assembly, which is connected to the outlet port of the oxygen cylinder. The oxygen cylinder is located in the forward cargo compartment (Fig. 401). The coupling assembly includes a pressure transducer and a thermal compensator which is an internal part and is removed and installed with the coupling assembly. Access to the pressure reducer and coupling assembly is through the access panels on the oxygen cylinders.
 TASK 35-21-12-004-001
 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 35-21-12

 (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 914-022
 (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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747-400
MAINTENANCE MANUAL

MEDIUM PRESSURE
PRESSURE TRANSDUCER
CYLINDER B-NUT

Pressure Reducer Installation
Figure 401
　
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