(e)
Make sure that the dome lights in the flight compartment (captain and first officer) are on.
(f)
Open this circuit breaker:
1) P6, Main Power Distribution Panel a) 6J7, MN BAT RELAY CONT
(g)
Make sure that the digital clock displays go off.
(h)
Make sure that the dome lights in the flight compartment (captain and first officer) go off.
(i)
Close these circuit breakers:
1) P6, Main Power Distribution Panel a) 6A26, XFR RELAY BAT b) 6J7, MN BAT RELAY CONT
(j)
Make sure that the digital clock displays come on.
(k)
Make sure that the dome lights in the flight compartment (captain and first officer) come on.
S 715-027
(11)
Do a test of the MAIN BATTERY BUS/TRU (C8843) RCCB.
(a)
Make sure that the dome lights in the flight compartment (captain and first officer) are on.
(b)
Open this circuit breaker:
1) P6, Main Power Distribution Panel a) 6K4, TRU - CONT MN BAT BUS
(c)
Make sure that the dome lights in the flight compartment (captain and first officer) go off.
(d)
Close this circuit breaker:
1) P6, Main Power Distribution Panel a) 6K4, TRU - CONT MN BAT BUS
(e)
Make sure that the dome lights in the flight compartment (captain and first officer) come on.
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S 715-028
(12)
Do a test of the INVERTER POWER/TRU (C8844) RCCB.
(a)
Make sure that the main EICAS screen shows EICAS data.
(b)
Open these circuit breakers:
1) P6, Main Power Distribution Panel
a) 6B24, AC 3 STBY PWR
b) 6K2, MN BAT - CONT INVERTER PWR
(c)
Make sure that the main EICAS screen shows EICAS data.
(d)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6K5, TRU - CONT INVERTER PWR
(e)
Make sure that the main EICAS screen does not show EICAS data.
(f)
Close these circuit breakers:
1) P6, Main Power Distribution Panel
a) 6B24, AC 3 STBY PWR
b) 6K2, MN BAT - CONT INVERTER PWR
c) 6K5, TRU - CONT INVERTER PWR
(g)
Make sure that the main EICAS screen shows EICAS data.
S 715-029
(13)
Do a test of the APU BATTERY BUS/TRU (C10339) RCCB.
(a)
Make sure that the digital clock displays are on.
(b)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6J8, APU BAT BUS TRU - CONT
(c)
Make sure that the digital clock displays go off.
(d)
Close this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6J8, APU BAT BUS TRU - CONT
(e)
Make sure that the digital clock displays come on.
S 715-030
(14)
Do a test of the APU BATTERY BUS/APU BATTERY (C10340) RCCB.
(a)
Set the STANDBY POWER switch to BAT.
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747-400 MAINTENANCE MANUAL
(b)
Make sure that the digital clock displays are on.
(c)
Open this circuit breaker:
1) P6, Main Power Distribution Panel a) 6J9, APU BAT BUS APU BAT CONT
(d)
Make sure that the digital clock displays go off.
(e)
Close this circuit breaker:
1) P6, Main Power Distribution Panel a) 6J9, APU BAT BUS APU BAT CONT
(f)
Make sure that the digital clock displays come on.
