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747-400 MAINTENANCE MANUAL
 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

 S 865-013
 (10)
 Set the BATTERY switch to ON.

 S 865-014

 (11)
 Set the STANDBY POWER switch to AUTO.

 S 715-017

 (12)
 Energize the AC and DC buses.

 (a)  
Push the ELEC switch, on the P10 autoflight control panel, to get access to the EICAS electrical synoptic page.

 (b)  
Make sure that all four AC buses are energized.

 (c)  
Get access to the CMCS electrical maintenance page (AMM 45-10-00/201).

 (d)  
Make sure that DC-VOLTS 1, 2, 3, and 4 show approximately 28 volts DC.

 F. Do the Operational Test of the DC Electrical Load Distribution RCCBs.
 S 015-018
 WARNING: BE CAREFUL WHEN YOU DO TESTS ON THE CIRCUIT BREAKERS IN THE P6
_______ PANEL. THE P6 PANEL CONTAINS HIGH VOLTAGES THAT CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Open section P6-1 of the P6 main power distribution panel.

 S 715-019

 (2)  
Do a test of the DC BUS 1 (C10148) RCCB.

 (a)  
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10129 (6F6, FUEL SYS MGMT CH 1).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (b)  
Open this circuit breaker:

 1)  P6, Main Power Distribution Panel
 a) 6K6, DC BUS - CONT 1

 (c)  
Make sure that 0 volts dc is at terminal 2 of the circuit breaker C10129 (6F6, FUEL SYS MGMT CH 1).

 (d)  
Close this circuit breaker:

 1)  P6, Main Power Distribution Panel
 a) 6K6, DC BUS - CONT 1

 (e)  
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10129 (6F6, FUEL SYS MGMT CH 1).

 S 715-020
 (3)  
Do a test of the DC BUS 2 (C10149) RCCB.

 (a)  
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10130 (6F8, FUEL SYS MGMT CH 2).

 (b)  
Open this circuit breaker:

 1)  P6, Main Power Distribution Panel
 a) 6K7, DC BUS - CONT 2

 (c)  
Make sure that 0 volts dc is at terminal 2 of the circuit breaker C10130 (6F8, FUEL SYS MGMT CH 2).

 (d)  
Close this circuit breaker:

 1)  P6, Main Power Distribution Panel
 a) 6K7, DC BUS - CONT 2

 (e)  
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10130 (6F8, FUEL SYS MGMT CH 2).

 S 715-021
 (4)  
Do a test of the DC BUS 3 (C10150) RCCB.

 (a)  
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10123 (6D5, FUEL QTY 1).

 (b)  
Open this circuit breaker:

 1)  P6, Main Power Distribution Panel
 a) 6K8, DC BUS - CONT 3

 (c)  
Make sure that 0 volts dc is at terminal 2 of the circuit breaker C10123 (6D5, FUEL QTY 1).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (d)  
Close this circuit breaker:

 1)  P6, Main Power Distribution Panel
 a) 6K8, DC BUS - CONT 3

 (e)  
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10123 (6D5, FUEL QTY 1).

 S 715-022
 (5)  
　
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