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AV BATT
DIR BUS
AV
BATT
20°C
APU
BATT
APU BATT
DIR BUS
ESS
TRU 2
28V
35A
AC BUS 3
FEEDER
DC BUS 2
TRU 2
28V
35A
TRU 1
28V
35A
ESS
TRU 2
ESS
TRU 1
TRU 2 TRU 1
GX_06_031
BATT BUS
ESS
TRU 2
28
35
V
A
TRU 2
28
35
V
A
ESS
TRU 1
28
35
V
A
TRU 1
28
35
V
A
-Normally powered by ESS TRU 2, alternately powered by the following, in descending order:
6-32 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ELECTRICAL
DC BUS 2
DC ELECTRICAL
AC BUS 2
FEEDER
DC BUS 1
26V 24V
0A 0A
-10°C
AC BUS 1
FEEDER
DC ESS BUS
ESS
TRU 1
AC ESS
BUS
BATT BUS
DC EMER
BUS
AV BATT
DIR BUS
AV
BATT
20°C
APU
BATT
APU BATT
DIR BUS
ESS
TRU 2
AC BUS 3
FEEDER
DC BUS 2
TRU 1 TRU 2
28
35
V
A
0
0
V
A
23
45
V
A
28
42
V
A
DC ELECTRICAL
AC BUS 2
FEEDER
DC BUS 1
26V 24V
0A 0A
-10°C
AC BUS 1
FEEDER
DC ESS BUS
ESS
TRU 1
28V
35A
AC ESS
BUS
BATT BUS
DC EMER
BUS
AV BATT
DIR BUS
AV
BATT
20°C
APU
BATT
APU BATT
DIR BUS
ESS
TRU 2
28V
35A
AC BUS 3
FEEDER
DC BUS 2
TRU 2
28V
35A
TRU 1
28V
35A
GX_06_032
DC BUS 2
TRU 2
28
35
V
A
ESS
TRU 2
28
35
V
A
TRU 2
ESS TRU 2
-Normally powered by TRU 2, alternately powered by the following, in descending order:
For Training Purposes Only
Sept 04
6-33
P I LOT T R A I N I N G GU I D E
ELECTRICAL
EXTERNAL DC POWER
EXT DC
AVAIL
ON
EXT DC
AVAIL
ON
GX_06_033
APU
BATT
20°C
EXT
DC
24
APU
BATT
20°C
0
V
A
EXT
DC
AVAIL Light
Indicates that external DC power
is connected (not on-line) and is
within limits.
ON Light
Indicates external DC power is
powering APU BATT DIR BUS.
DC ELECTRICAL
AC BUS 2
FEEDER
DC BUS 1
26V 24V
0A 0A
-10°C
AC BUS 1
FEEDER
DC ESS BUS
ESS
TRU 1
AC ESS
BUS
DC EMER
BUS
AV
BATT
20°C
APU
BATT
ESS
TRU 2
AC BUS 3
FEEDER
DC BUS 2
TRU 1 TRU 2
0
0
V
A
0
0
V
A
0
0
V
A
0
0
V
A
EXT
DC
24
10
V
A
AV BATT
DIR BUS
BATT BUS
APU BATT
DIR BUS
CHARGER CHARGER
6-34 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ELECTRICAL
RAT GEN FEED
Emergency AC power is supplied by the ram air turbine (RAT) in flight, rated at
115 volts, 9 kVA, 3-phase. With engines running, the RAT will deploy with a 14-
second time delay following the loss of all AC power, if the slat/flap handle is at the
in/zero position. It will deploy automatically if the slat/flap handle is not at the in/zero
position. With a dual-engine failure, the RAT will deploy automatically, regardless of
slat/flap handle position. The RAT can also be manually deployed by pulling RAT
manual deploy handle, located on the center pedestal. Once deployed, the RAT will
power the AC ESS BUS via the ram air turbine line contactor (RATLC).
This delay is implemented to allow the pilot to regain GEN 1-2-3 or 4, or APU GEN
power.
NOTE
The AC ESS BUS will power ESS TRU 2 which will then feed the
BATT BUS and the DC ESS BUS through the emergency tie
contactor (ETC). Should ESS TRU 2 be unavailable, the
emergency TRU tie contactor (ETTC) will close rerouting the
power via ESS TRU 1.
In the event that an operating generator is restored, select the RAT GEN switch to
OFF. The RAT GEN will remain in a standby mode.
RAT GEN
ON
OFF
AC ELECTRICAL
00
0
V
KVA
HZ
GEN
APU
AC BUS 1
00
V
KVA
　
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