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December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.10.4 D6-30151-425
Electrical -
Controls and Indicators
APU Generator and External Power Controls
1 APU Generator (APU GEN) Control Switches
Push –
• AVAIL light illuminated: connects related APU generator to AC electrical
system
• ON light illuminated: disconnects related APU generator from AC
electrical system
2 APU Generator Power Available (AVAIL) Lights
Illuminated (white) -
• APU generator power quality acceptable
• extinguishes when ON light illuminates
3 APU Generator Power ON Lights
Illuminated (white) -
• related APU generator connected to AC electrical system
• extinguishes when AVAIL light illuminates
A
V
A
I
L
OFF
AUTO
BAT
STANDBY POWER
EXT PWR 1 APU GEN 1
L UTILITY R
BATTERY
ON ON ON ON
ON
OFF
ON
OFF
ON
OFF
OFF START
ON
APU
APU GEN 2 EXT PWR 2
A
V
A
I
L
A
V
A
I
L
A
V
A
I
L
OVERHEAD PANEL
1
2
3
4
5
6
December 01, 1999
747 Operations Manual
Electrical -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.10.5
4 External Power (EXT PWR) Control Switches
Push -
• AVAIL light illuminated: connects related external power toAC electrical
system
• ON light illuminated: disconnects related external power from AC
electrical system
5 External Power ON Lights
Illuminated (white) -
• related external power connected to AC electrical system
• extinguishes when AVAIL light illuminates
6 External Power Available (AVAIL) Lights
Illuminated (white) -
• related external power source plugged in, power quality acceptable
• extinguishes when ON light illuminates
AC Bus and Generator Controls
1 BUS TIE Switches
AUTO –
• arms automatic AC bus tie circuitry
• closes related DC isolation relay
OVERHEAD PANEL
2
6
1
DRIVE
BUS
GEN
CONT
DRIVE
DISC
ON
OFF
ISLN
AUTO
DRIVE
BUS
ON
OFF
ISLN
AUTO
3
DRIVE
ON
OFF
ISLN
AUTO
4
DRIVE
ON
OFF
ISLN
AUTO
BUS BUS
2
BUS
TIE
1
3
4
5
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.10.6 D6-30151-425
Electrical -
Controls and Indicators
OFF -
• opens AC bus tie breaker and related DC isolation relay
• resets fault logic circuitry
2 Bus Isolation (ISLN) Lights
Illuminated (amber) -
• AC bus tie breaker open
• AC bus isolated from synchronous bus
3 Generator Drive Disconnect (DRIVE DISC) Switches
Push -
• disconnects integrated drive generator (IDG) from engine when above
idle speed
• opens related generator control breaker
Note: Ground maintenance action required to reconnect IDG.
4 Generator DRIVE Lights
Illuminated (amber) -
• IDG oil pressure low, or
• IDG oil temperature high
5 Generator Control (GEN CONT) Switches
ON - arms generator control breaker to close when generator power quality
acceptable.
OFF -
• opens field and generator control breakers
• resets fault control logic circuitry
• isolates generator from its related AC bus
6 Generator OFF Lights
Illuminated (amber) - generator control breaker open.
October 1, 2000
747 Operations Manual
Electrical -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.10.7
Overhead Maintenance Panel
Generator Field Manual Reset and Split System Breaker
Switches
1 Generator Field Manual Reset (GEN FIELD MAN RESET) Switches
Push - (spring-loaded toggle, guarded) opens or closes generator field if related
Generator Control or APU Generator Control switch off.
2 Generator FIELD OFF Lights
Illuminated (white) - generator field open.
3 SPLIT SYSTEM BREAKER Switch
Push - (spring-loaded toggle, guarded) opens or closes split system breaker.
Note: Operative on ground only.
4 Split System Breaker OPEN Light
Illuminated (white) - split system breaker open.
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