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Engine-driven integrated drive generators (IDGs) supply the primary source of AC electrical power. A generator mounted on the auxiliary power unit (APU) provides an alternate source of AC electrical power. In flight, if a total loss of AC power occurs, the air-driven generator (ADG) is deployed from the right side of the forward fuselage to provide an emergency source of AC electrical power. External AC electrical power is supplied through an electrical power receptacle, located on the right side of the forward fuselage. Various aircraft systems and components require DC electrical power for operation. DC electrical power needs are primarily supplied by four transformer rectifier units (TRU) mounted in the nose compartment. The aircraft is equipped with two nickel-cadmium (NiCad) batteries that store and provide a source of DC electrical power for normal and emergency operations. The main battery is located in the nose section, the APU battery is in the aft equipment bay. The aircraft is capable of accepting 28-volt DC external electrical power through a DC power receptacle, installed on the rear fuselage below the right engine. Five circuit breaker panels provide power distribution. Four circuit breaker panels are located in the flight compartment, and the fifth panel is in the aft equipment bay. Control and operation are accomplished through the ELECTRICAL POWER panel, located on the left side of the overhead panel. AC and DC electrical system information is provided on the EICAS. AC Electrical Power Sources
ELECTRICAL Description Vol. 2 07.10.2
ALTERNATING CURRENT (AC) SYSTEM
Components and Operation
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