(4)  
Disconnect the electrical connector from the voltage averaging unit.

 S 024-006

 (5)  
Remove the voltage averaging unit:

 (a)  
Remove the fasteners (4 locations).

 (b)  
Remove the voltage averaging unit.

 S 014-018
 S 034-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
DOOR FOR THE
VOLTAGE FORWARD CARGO
AVERAGING
STA
COMPARTMENT
UNIT

Voltage Averaging Unit Installation
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 35-21-10-404-007
 3.  Voltage Averaging Unit Installation (Fig. 401)___________________________________
 A. References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
AMM 35-21-00/501, Oxygen System

 (3)  
SSM 35-11-01

 (4)  
WDM 35-11-13

 (5)  
IPC 35-21-10

 B. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
 C. 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 424-008

 (2)  
Install the voltage averaging unit:

 (a)  
Put the voltage averaging unit in position.

 (b)  
Install the fasteners (4 locations).

 S 434-009
 (3)  
Connect the electrical connector to voltage averaging unit, and install a lockwire on the electrical connector.

 S 784-011

 (4)  
Do the procedure: Do the Pressure Indication Test, in the task: Oxygen Operational Test (AMM 35-21-00/501).

 (5)  
Close the access panels to the oxygen cylinders.

 S 414-021
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PRESSURE TRANSDUCER - REMOVAL/INSTALLATION
__________________________________________
 1.  General_______
 A.  These tasks are included in this procedure:
 (1)  
Removal of the pressure transducer.

 (2)  
Installation of the pressure transducer.

 B.  The removal and installation procedures are for a one pressure transducer. To do the procedures for a second pressure transducer do the same steps again.
 C.  A pressure transducer is installed on each cylinder coupling assembly (Fig. 401). Access to each pressure transducer is through the access panels.
 TASK 35-21-11-004-001
 2.  Pressure Transducer 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 35-21-11

 (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 914-021
 (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:
　
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