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Synoptic page to indicate a failure.
ELECTRICAL
For Training Purposes Only
May 03
7-25
P I LOT T R A I N I N G GU I D E
MAIN and APU BATT DIR BUSES
These DC buses are continuously powered from the associated battery, regardless of
the BATT MASTER switch position. The main battery is connected to the MAIN
BATT DIR BUS and the APU battery is connected to the APU BATT DIR BUS. These
buses provide power to the aircraft systems which primarily relate to ground service
operation (refueling, service lights, etc.). The APU BATT DIR BUS also supplies the
DC EMER BUS.
DC Emergency Bus
The DC EMER BUS provides power to the engine and APU fire extinguishers and the
fuel and hydraulic shutoff valves. The bus is connected to the APU BATT DIR BUS
and the BATT BUS and is continuously powered.
BATT BUS
Refer to the TRU distribution section of this chapter.
External DC Electrical Power
External DC ground power may be used to start the APU if the APU battery charge is
low. The External DC receptacle is located at the rear of the aircraft near the right
engine pylon (see Figure 7-18).
External DC Receptacle
Figure 7-18
P604_07_056
ELECTRICAL
7-26 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
When connected, external DC ground power automatically supplies the APU BATT
DIR BUS through the External DC contactor, and the BATT BUS when the BATT
MASTER switch is selected ON. The DC EXTERNAL POWER white IN USE light
on the ELECTRICAL POWER panel illuminates whenever DC external power is
connected.
External DC ground power is identified on the DC Electrical Synoptic page by the
symbol EXT DC. This symbol appears only if DC external power is connected to the
aircraft.
External DC Power Connected
Figure 7-19
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
P604_07_040
DC ELECTRICAL
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
0 V
0 A
TRU 2
0 V
0 A
ESS
TRU 2
0 V
0 A
ESS
TRU 1
0 V
0 A
MAIN
BATT
24 V
18 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
ELECTRICAL
For Training Purposes Only
May 03
7-27
P I LOT T R A I N I N G GU I D E
Circuit Breakers
Description
Electrical power distribution is accomplished through five circuit breaker panels. Four
circuit breaker panels are installed in the flight deck and the fifth panel is in the aft
equipment bay. They are identified as follows (see Figure 7-20):
• Circuit Breaker Panel 1 (CBP-1)
• Circuit Breaker Panel 2 (CBP-2)
• Circuit Breaker Panel 3 (CBP-3)
• Circuit Breaker Panel 4 (CBP-4)
• Circuit Breaker Panel 5 (CBP-5)
Electrical equipment protection is provided by conventional thermal circuit breakers.
When a circuit breaker is tripped, a white collar is exposed. Depending on airplane
completion specification, circuit breakers may also be located in other parts of the
airplane. Should a circuit breaker trip while the airplane is in flight, the circuit breaker
should be allowed to cool for as long as possible before resetting.
Do not attempt more than one reset of a circuit breaker.
NOTE
ELECTRICAL
7-28 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Circuit Breaker Panels (CBPS)
Figure 7-20
CBP-3 CBP-4
CBP-2 CBP-1
CBP-1
(LOWER)
CBP-5
AC ESS
BUS
DC ESS
BUS
AC BUS 2
DC BUS 2
BATT BUS
AC BUS 1
DC BUS 1
BATT BUS
EMERGENCY
MAIN BATT
DIR BUS
APU BATT
DIR BUS
P604_07_011
ELECTRICAL
For Training Purposes Only
May 03
7-29
P I LOT T R A I N I N G GU I D E
Circuit Breaker Grid System
A circuit breaker can be located, when called for in a procedure, by using the grid
reference on the circuit breaker panel.
For example, the “VOLTS & FREQ IND” circuit breaker location is identified as
(3A13), and therefore found on panel CBP-3, row A, column 13 (see Figure 7-21).
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