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APU Power Figure 07.10.5
External AC Electrical Power
The aircraft is capable of being powered by an external AC power source when both engines and APU are off. External AC electrical power is connected at an external AC receptacle, located on the forward right side of the fuselage.
ELECTRICAL Description Vol. 2 07.10.8
Oct 05/06
External AC Receptacle Figure 07.10.6
Operation
External AC ground power is controlled by the EXT POWER switch/light, located on the ELECTRICAL POWER panel. When connected, the external AC ground power is checked by an external power monitor for proper voltage, frequency, and phase. When the external power is within limits, the green AVAIL annunciator on the EXT POWER switch/light illuminates.
ELECTRICAL Description Vol. 2 07.10.9
Oct 05/06
External AC Electrical Power Available Figure 07.10.7
When the EXT POWER switch/light is pressed with the AVAIL annunciator illuminated, external AC electrical power is connected to the aircraft main AC buses via the auxiliary power/external power contactor. The IN USE annunciator then illuminates.
External AC ground power is identified on the AC ELECTRICAL synoptic page by the symbol EXT AC. This symbol appears only if external AC power is connected to the aircraft.
ELECTRICAL Description Vol. 2 07.10.10
Oct 05/06
External AC Electrical Power In Use
Figure 07.10.8
AC ELECTRICAL POWER DISTRIBUTION
Description
115-volt AC electrical power, from the aircraft generators and APU generator, is distributed to five AC buses through circuit breaker panels. Monitoring of system status is done using the AC ELECTRICAL synoptic page.
The aircraft AC bus system consists of the following five buses:
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AC BUS 1 (Main);
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AC BUS 2 (Main);
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AC ESS BUS (Essential);
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AC UTILITY BUS 1; and
ELECTRICAL Description Vol. 2 07.10.11
Oct 05/06
. AC UTILITY BUS 2.
AC ELECTRICAL Synoptic Page
Figure 07.10.9
Components and Operation
AC BUS 1 and AC BUS 2
AC BUS 1 and AC BUS 2 are the main AC buses of the aircraft, and receive power from any of the three generators, or from external AC power. AC BUS 1 normally supplies power to the AC ESS BUS and AC UTIL BUS 1. AC BUS 2 normally powers AC UTIL BUS 2.
Bus Priority
AC BUS 1 and AC BUS 2 are protected by a bus priority logic, to ensure that the buses remain powered at all times. The generator control units (GCUs) determine the bus priority for AC BUS 1 and AC BUS 2 via the generator line contactors (GLCs) and generator transfer contactors (GTCs). The bus priority logic for AC BUS 1 and AC BUS 2 is as follows:
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On-side engine-driven generator (example: AC BUS 1 powered by GEN 1);
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