(a)
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10124 (6D6, FUEL QTY 2).
(b)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K9, DC BUS - CONT 4
(c)
Make sure that 0 volts dc is at terminal 2 of the circuit breaker C10124 (6D6, FUEL QTY 2).
(d)
Close this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K9, DC BUS - CONT 4
(e)
Make sure that approximately 28 volts dc is at terminal 2 of the circuit breaker C10124 (6D6, FUEL QTY 2).
S 415-038
(6)
Close section P6-1 of the P6 main power distribution panel.
S 715-023
(7)
Do a test of the MAIN BATTERY HOT BUS/P6 (C8839) RCCB.
(a)
Get access to the CMCS electrical maintenance page
(AMM 45-10-00/201).
(b)
Make sure that MAIN BAT shows approximately 28 volts.
(c)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K1, MN BAT HOT BUS P6 - CONT
(d)
Make sure that MAIN BAT shows approximately 0 volts.
(e)
Close this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K1, MN BAT HOT BUS P6 - CONT
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747-400 MAINTENANCE MANUAL
(f) Make sure that MAIN BAT shows approximately 28 volts.
S 715-024
(8)
Do a test of the INVERTER POWER/MAIN BATTERY (C8840) RCCB.
(a)
Make sure that the main EICAS screen shows EICAS data.
(b)
Set the STANDBY POWER switch to BAT.
(c)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K2, MN BAT - CONT INVERTER PWR
(d)
Make sure that the main EICAS screen does not show EICAS data.
(e)
Close this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K2, MN BAT - CONT INVERTER PWR
(f)
Set the STANDBY POWER switch to AUTO.
S 715-025
(9)
Do a test of the MAIN BATTERY BUS/MAIN BATTERY (C8841) RCCB.
(a)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6A26, XFR RELAY BAT
(b)
Make sure that the dome lights in the flight compartment (captain and first officer) are on.
(c)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K3, MN BAT - CONT MN BAT BUS
(d)
Make sure that the dome lights in the flight compartment (captain and first officer) go off.
(e)
Close these circuit breakers:
1) P6, Main Power Distribution Panel
a) 6K3, MN BAT - CONT MN BAT BUS
b) 6A26, XFR RELAY BAT
(f)
Make sure that the dome lights in the flight compartment (captain and first officer) come on.
S 715-026
(10)
Do a test of the MAIN BATTERY RELAY (C8842) RCCB.
(a)
Make sure that the captain and first officer digital clock displays are on.
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A
747-400
MAINTENANCE MANUAL
(b)
Make sure that the dome lights in the flight compartment (captain and first officer) are on.
(c)
Open this circuit breaker:
1) P6, Main Power Distribution Panel a) 6A26, XFR RELAY BAT
(d)
Make sure that the digital clock displays are on.
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