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 E.  The mask and the system need to be put back in its usual condition whenever the oxygen system has been operated. This can occur either electrically once the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel is moved to on or automatically by the flow control units.
 TASK 35-21-00-862-003-002
 2.  Oxygen Cylinder Wire Change (Fig. 201)___________________________
 A.  Consumable Materials
 (1)  G00294 Tape - Masking Permacel No. 76
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 35-00-00/201, Oxygen

 (3)  
AMM 35-21-06/401, Supernumerary Oxygen Mask

 (4)  
IPC 35-21-10 Fig. 1

 (5)  
SSM 35-11-01

 (6)  
WDM 35-11-13

 C.  Access
 (1)  Location Zone 124 Fwd Cargo Container Compartment Aft Half, Right
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747-400
MAINTENANCE MANUAL

OXYGEN CYLINDER CARGO SIDEWALL INSTALLATIONS 
CYLINDERS OXYGEN NUMBER OF  JUMPER PINS 
2 6 9 8 7 5 4 3  11-19 11-18 11-17 11-16 11-15 11-14 11-13 11-12 

SUPERNUMERARY OXYGEN

Connector Wiring Change
Figure 201

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M02123
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747-400 MAINTENANCE MANUAL
 D. Procedure
 S 912-004-002
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).

 S 862-005-002

 (2)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND

 S 012-007-002
 (3)  Open the access panel to the oxygen cylinders.
 NOTE: The access panel is attached by snaps and velcro tape.
____
 S 862-008-002
 (4)  
Count the number of oxygen cylinders that are installed.

 S 032-009-002

 (5)  
Disconnect the electrical connector DM984 from the voltage averaging unit M984. Change the jumper wire P/N W1092-042-22 as shown in Fig. 201.

 NOTE: One end of the jumper will remain on pin 11 (feedback) of
____ the electrical connector. The other end of the jumper is changed for input match.
 S 432-017-002
 (6)
Connect the electrical connector to the voltage averaging unit.

 (7)  
Supply the electrical power (Ref 24-22-00/201).

 S 862-019-002

 (8)  
Remove the DO-NOT-CLOSE tag and close the following circuit breaker:

 S 862-018-002
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND

 S 782-021-002
 (9)  Do the step: Do the Pressure Indication Test, in the task: Oxygen Operational Test (AMM 35-21-00/501).
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747-400 MAINTENANCE MANUAL
 S 412-023-002
 (10) Close the access panels to the oxygen cylinders.
 NOTE: The access panel are attached by snaps and velcro tape.
____
 S 862-024-002
 (11) Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

 TASK 35-21-00-862-025-002
 3.  Supernumerary Oxygen System Reset_________________________________
 A. References
 (1)  
AMM 12-15-08/301, Oxygen Servicing
　
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