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* Standby DC alternate (K3)
* Standby normal (K5).
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You use the MAINT switch to show messages for the fault that
causes the ELEC light. The messages show on the module LED
alphanumeric display. See section 24-00 for more information
about the P5-13 Built-in-test equipment (BITE). (SECTION 24-00)
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24-40-00
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Purpose
External power is the usual source of AC power for the airplane
electrical system when the airplane is on the ground.
General
The external power source supplies AC power to the airplane.
The airplane electrical components change the AC power to DC
power.
External power has these components:
* External power receptacle
* External power contactor (EPC)
* Bus power control unit (BPCU).
EXTERNAL POWER - INTRODUCTION
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Purpose
External power is the normal source of AC power for the
airplane electrical system when the airplane is on the ground. It
lets you have the engines and APU power sources off. It also
gives power to the battery charger to charge the battery.
General Description
The bus power control unit (BPCU) uses inputs and internal
logic to control distribution of external power on the airplane.
The BPCU has built-in test equipment (BITE) to help you do
troubleshooting of the external power system.
Switches on the AC system, generator, and APU module and
the forward attendant panel give you manual control of external
power.
The external power panel and the AC system, generator, and
APU module have external power indication.
The external power panel has a receptacle for AC external
power connection.
Bus Power Control Unit (BPCU)
The BPCU uses these inputs to control the use of external
power:
* External power contactor (EPC) position
* Bus tie breaker (BTB) positions through the generator
control units (GCUs)
* Ground service transfer relays (power to AC ground service
buses)
* Ground service bus relay (power to ground service DC bus)
* Indication on the AC system, generator, and APU module
and the external power panel.
The BPCU also interfaces with other systems. See the BPCU
pages in this section for more information.
Manual Control
The ground power switch is on the AC system, generator, and
APU module (P5-4).
You use this switch to control external power to the AC transfer
buses through the EPC and the BTBs. The BPCU closes the EPC
directly. Each BTB closes after it receives a signal from the
BPCU through a GCU.
A switch on the forward attendant panel lets you supply power
to the AC and DC ground service buses from the external power
source. The AC power goes through the two ground service
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