(j) Make sure that DC-VOLTS 1, 2, 3, and 4 are approximately 28 volts.
S 715-016
(5)
Do a test of the battery transfer relay.
(a)
Make sure the digital clock displays on the captain's and the first officer's instrument panels are on.
(b)
Make sure the dome lights in the flight compartment are on.
(c)
Open this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6J7, MN BAT RELAY CONT
(d)
Make sure the digital clock displays stay on.
(e)
Make sure the dome lights stay on.
(f)
Close this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6J7, MN BAT RELAY CONT
S 715-039
(6)
Do a test of the single-TRU operation relay and the main battery relay.
(a)
Open these circuit breakers:
1) P6, Main Power Distribution Panel
a) 6A5, TRU 1
b) 6A14, TRU 2
c) 6A32, TRU 4
(b)
Make sure the digital clock displays are on.
(c)
Make sure the dome lights in the flight compartment are on.
(d)
Open these circuit breakers:
1) P6, Main Power Distribution Panel
a) 6J7, MN BAT RELAY CONT
(e)
Make sure the digital clock displays are off.
(f)
Make sure the dome lights are off.
(g)
Close this circuit breaker:
1) P6, Main Power Distribution Panel
a) 6J7, MN BAT RELAY CONT
(h)
Make sure the digital clock displays are on.
(i)
Make sure the dome lights are on.
(j)
Close these circuit breakers:
1) P6, Main Power Distribution Panel
a) 6A5, TRU 1
b) 6A14, TRU 2
c) 6A32, TRU 4
S 715-043
(7)
Do a test of the dc voltage sense relay.
(a)
Open these circuit breakers:
1) P6, Main Power Distribution Panel
a) 6K3, MN BAT-CONT MN BAT BUS
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747-400 MAINTENANCE MANUAL
b) 6J9, APU BAT BUS APU BAT CONT
(b)
Set the STANDBY POWER switch to BAT.
(c)
Make sure the digital clock displays are off.
(d)
Make sure the dome lights in the flight compartment are off.
(e)
Close these circuit breakers:
1) P6, Main Power Distribution Panel a) 6K3, MN BAT - CONT MN BAT BUS b) 6J9, APU BAT BUS APU BAT CONT
(f)
Set the STANDBY POWER switch to AUTO.
(g)
Make sure the digital clock displays are on.
(h)
Make sure the dome lights are on.
S 715-015
(8)
Do a test of the disable relays for the main battery charger and the APU battery charger.
(a)
Set the STANDBY POWER switch to BAT.
(b)
Make sure these EICAS messages show:
1) >BAT DISCH MAIN (ADVISORY)
2) >BAT DISCH APU (ADVISORY)
(c)
Set the STANDBY POWER switch to AUTO.
(d)
Make sure these EICAS messages do not show:
1) >BAT DISCH MAIN (ADVISORY)
2) >BAT DISCH APU (ADVISORY)
E. Put the Airplane to its Usual Condition
S 865-032
(1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6, Main Power Distribution Panel
1) 6F24, FLT DK LIGHTS DOME
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
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