WARNING: MAKE SURE TO OPEN THE APPLICABLE ENGINE IGNITION CIRCUIT
_______ BREAKERS BEFORE YOU DO THE TEST. THE IGNITER PLUGS CAN AUTOMATICALLY FIRE IF YOU DO NOT OPEN THE CIRCUIT BREAKERS. WITH FUEL IN THE COMBUSTION CHAMBER, AN INTERNAL ENGINE OR TAILPIPE FIRE CAN OCCUR. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO THE ENGINE.
 (4)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel 1) 6F1, IGN 1 ENG 1 2) 6K19, IGN 2 ENG 1 3) 6G19, STBY IGN ENG 1 4) 6F2, IGN 1 ENG 2 5) 6K20, IGN 2 ENG 2 6) 6G20, STBY IGN ENG 2 7) 6F3, IGN 1 ENG 3 8) 6K21, IGN 2 ENG 3 9) 6G21, STBY IGN ENG 3 10) 6F4, IGN 1 ENG 4 11) 6K22, IGN 2 ENG 4 12) 6G22, STBY IGN ENG 4

 (5)  
Make sure the BATTERY switch, on the P5 panel, is set to ON.

 S 864-035
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747-400 MAINTENANCE MANUAL
 S 864-036
 (6)  
Make sure the STANDBY POWER switch, on the P5 panel, is set to AUTO.

 S 714-038

 (7)  
Open these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6A5, TRU 1
 2) 6A14, TRU 2
 3) 6A32, TRU 4

 (b)  
Make sure the digital clock displays are on.

 (c)  
Make sure the dome lights in the flight compartment are on.

 S 714-039
 (8)  
Open these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6J7, MN BAT RELAY CONT

 (b)  
Make sure the digital clock displays are off.

 (c)  
Make sure the dome lights are off.

 S 714-040
 (9)  
Close this circuit breaker:

 (a)  
P6, Main Power Distribution Panel
 1) 6J7, MN BAT RELAY CONT

 (b)  
Make sure the digital clock displays are on.

 (c)  
Make sure the dome lights are on.

 S 864-041
 (10)
 Close these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6A5, TRU 1
 2) 6A14, TRU 2
 3) 6A32, TRU 4

 S 864-042
 (11)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6F24, FLT DK LIGHTS DOME

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 2) 6F1, IGN 1 ENG 1
 3) 6K19, IGN 2 ENG 1
 4) 6G19, STBY IGN ENG 1
 5) 6F2, IGN 1 ENG 2
 6) 6K20, IGN 2 ENG 2
 7) 6G20, STBY IGN ENG 2
 8) 6F3, IGN 1 ENG 3
 9) 6K21, IGN 2 ENG 3
 10) 6G21, STBY IGN ENG 3
 11) 6F4, IGN 1 ENG 4
 12) 6K22, IGN 2 ENG 4
 13) 6G22, STBY IGN ENG 4

 S 864-026
 (12) Remove electrical power, if it is not necessary (AMM 24-22-00/201).
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 1.

2.

3.

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747-400 MAINTENANCE MANUAL
 AC EXTERNAL POWER - DESCRIPTION AND OPERATION
_____________________________________________
General
_______
 A.  External power supplied to the airplane is 115-volts ac and is connected through two external power receptacles, each rated for 90 kVA continuous operation. Both receptacles are located on the lower fuselage, aft of the nose gear, and supply power to the main load buses through their respective external power contactors (XPCs), bus tie breakers (BTBs), and the split system breaker (SSB).
　
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