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A 747-400 MAINTENANCE MANUAL
DOOR TO THE
VOLTAGE FORWARD CARGO
AVERAGING
STA
COMPARTMENT
UNIT
Voltage Averaging Unit Installation
Figure 401
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A
747-400 MAINTENANCE MANUAL
S 024-005
(5) Remove the voltage averaging unit:
(a)
Remove the four fasteners.
(b)
Remove the voltage averaging unit.
TASK 35-11-12-404-006
3. Voltage Averaging Unit Installation (Fig. 401)___________________________________
A. References
(1)
AMM 35-00-00/201, Oxygen
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 35-11-00/501, Crew Oxygen System
(4)
IPC 35-11-12
B. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
C. Procedure
S 914-015
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 424-007
(2)
Install the voltage averaging unit:
(a)
Set the voltage averaging unit in position.
(b)
Install the four fasteners.
S 434-008
(3)
Connect the DM992 electrical connector to the voltage averaging unit (M992).
(4)
Lockwire the connector to the voltage averaging unit.
(5)
Supply the electrical power (AMM 24-22-00/201).
S 864-010
(6)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
S 434-016
S 864-009
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
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A 747-400 MAINTENANCE MANUAL
(7) S 784-011Do the Task: Operational Test - Crew Oxygen (AMM 35-11-00/501).
NOTE:____ It is not necessary to include the paragragh "Crew Oxygen Mask/Regulator Stowage Box In-Situ Test" which is in the task "Operation Test - Crew Oxygen".
(8) S 414-012Close the cylinder access panels which is attached by snaps and velcro tape.
(9) S 864-013Remove the electrical power if is not necessary (AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
MASK/REGULATOR AND STOWAGE BOX - MAINTENANCE PRACTICES
______________________________________________________
1. General_______
A. This task is included in this procedure:
(1) Crew Oxygen Mask/Regulator Stowage.
B. The mask must be properly stowed for fast and efficient mask donning.
C. The stowage procedure is for a single mask/regulator and stowage box. To do the procedure on all other masks/regulators and stowage boxes, do the same steps again.
D. A mask stowage box is installed at each crew station (Fig. 201). Access to each mask stowage box is through the flight compartment.
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