S 864-025

 (3)  
Make sure the applicable FUEL CONTROL switch, found on the engine start module, is in the CUTOFF position.

 (a)  
Attach a DO-NOT-OPERATE tag to the FUEL CONTROL switch.

 S 864-026
 (4)  
Push the STAT button on the EICAS display select panel.

 (a)  
Make sure the status page appears on the auxiliary EICAS.

 (b)  
Make sure the applicable FUEL SPAR VLV (1, 2, 3, or 4) or FUEL CUTOFF ENG (1, 2, 3, or 4) message(s) are not shown.

___
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A
747-400 MAINTENANCE MANUAL
 S 864-027
 WARNING: MAKE SURE YOU OPEN THE APPLICABLE CIRCUIT BREAKERS FOR THE
_______ ENGINE IGNITION BEFORE YOU OPEN THE ENGINE CIRCUIT BREAKER FOR THE FUEL CONTROL VALVE. THE IGNITER PLUGS CAN START THE IGNITION AUTOMATICALLY IF YOU DO NOT OPEN THE CIRCUIT BREAKERS. IF THE COMBUSTION CHAMBER HAS FUEL IN IT, AN INTERNAL ENGINE FIRE OR A TAILPIPE FIRE CAN OCCUR. THE FIRE CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE ENGINE.
 (5)  FOR THE APPLICABLE ENGINE; Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) 6F01 IGN 1 ENG 1
 2) 6G19 STBY IGN ENG 1
 3) 6K19 IGN 2 ENG 1
 4) 6F02 IGN 1 ENG 2
 5) 6G20 STBY IGN ENG 2
 6) 6K20 IGN 2 ENG 2
 7) 6F03 IGN 1 ENG 3
 8) 6G21 STBY IGN ENG 3
 9) 6K21 IGN 2 ENG 3
 10) 6F04 IGN 1 ENG 4
 11) 6G22 STBY IGN ENG 4
 12) 6K22 IGN 2 ENG 4

 S 864-028
 (6)  FOR THE APPLICABLE ENGINE; Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) 6G01 FUEL SHUTOFF VALVE ENG 1
 2) 6L10 FUEL CONT VALVE ENG 1
 3) 6G02 FUEL SHUTOFF VALVE ENG 2
 4) 6L11 FUEL CONT VALVE ENG 2
 5) 6G03 FUEL SHUTOFF VALVE ENG 3
 6) 6L12 FUEL CONT VALVE ENG 3
 7) 6G04 FUEL SHUTOFF VALVE ENG 4
 8) 6L13 FUEL CONT VALVE ENG 4

 S 014-029
 (7)  Open the left and right core cowl panels (AMM 71-11-06/201), and/or the thrust reverser halves (AMM 78-31-00/201), as necessary.
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 ALL  ú ú 01B Page 419 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 864-030

 WARNING:_______ DO NOT KEEP ELECTRICAL POWER ON DURING REMOVAL OR INSTALLATION
 OF THE FUEL LINES.  INJURY TO PERSONS AND DAMAGE TO EQUIPMENT
 CAN OCCUR IF POWER IS APPLIED TO THE ELECTRICAL, HYDRAULIC OR

 FUEL SYSTEMS.
 (8)  
Remove the electrical power from the airplane (AMM 24-22-00/201).

 S 684-031

 (9)  
Drain the fuel from the fuel line and the engine fuel pump (Figure 401, View D).

 (a)  
Remove the drain plug from the fuel pump.

 (b)  
Drain the fuel into the container.

 (c)  
Remove and discard the O-ring from the drain plug.

 S 434-032
 (10)
 Install the drain plug after you have drained the fuel.

 (a)  
Use a new O-ring lubricated with the petrolatum.

 (b)  
Tighten the drain plug to 45-55 pound-inches (5.1-6.2 Newton-meters).

 (c)  
Install the lockwire on the drain plug.

 S 014-033
 (11)
 Open the applicable wing leading edge cover (Fig. 401, View B and C) (AMM 54-51-01/401).

 S 014-034

 (12)
 Open the applicable strut access panels (Fig. 401, View B and C) (AMM 54-62-00/201).

 S 034-101

 (13)
 Remove the Fuel Line (From the Engine Disconnect to the Forward Wing Spar) (Fig. 402).
　
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