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6 Figure 07-
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Circuit Breaker Panel 1 07-
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Circuit Breaker Panel 1 (Sub-
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Circuit Breaker Panel 2 07-
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Circuit Breaker Panel 2 (Sub-
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Circuit Breaker Panel 3 07-
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Circuit Breaker Panel 4 07-
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Miscellaneous Panels 07-
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Flight Crew Operating Manual MASTER
CSP A-
013
ELECTRICAL Vol. 1 07-
10-
1
Introduction REV 56, Jan 31/03
1. INTRODUCTION
The aircraft uses both115Volts ACand28 volts DCpower. AC electricalpower is provided bytwo engine-driven generation systems. Eachsystemincludes anintegrateddrive generator(IDG)and agenerator controlunit(GCU). An auxiliarypower unit(APU) generatoris also available as abackACpowersource toreplace eitherorbothIDGs.
Inthe eventoftotalACpower loss, emergencyACpoweris available from an in-flight air-driven generator(ADG). The ADG assemblyis stowedin acompartment ontheright sideofthe nose section.
DCpower is suppliedbyfive transformerrectifierunits(TRU) which rectifies ACinputpower intoDCoutputpower. Another source ofDCpower is from amain batteryandAPUbattery. The main and APUbatteries are connectedintotheaircraftDCelectricalpowersystem and are chargedbytheir respective battery chargers. Power for startingtheAPUis providedby theAPUbattery.
Electrical contactors, switchesand relays locatedthroughout13junction boxes in the aircraft, are usedforconnectingACandDCpower totheappropriatebuses and components. Powerconnection is dependentonsystemconfiguration andhealth. The followingis alistof allthe aircraft electricalsystem buses:
AC BUSSES DC BUSSES
AC BUS 1AC BUS 1 ACBUS 2AC BUS 2 AC ESSENTIAL BUS AC SERVICE BUS ADG BUS AC UTILITY BUS 1 AC UTILITY BUS 2 DC BUS 1 DC BUS 2 DC ESSENTIAL BUSDC ESSENTIALBUS DC SERVICE BUSDC SERVICE BUS LEFT AND RIGHT BATTERY BUSLEFT AND RIGHT BATTERY BUS D
C
E
M
E
R
G
E
N
C
Y
B
U
S
DC UTILITY BUS 1DC UTILITY BUS 1 DC UTILITY BUS 2DC UTILITY BUS 2 MAIN BATTERY DIRECT BUSMAIN BATTERY DIRECT BUS APU BATTERY DIRECT BUS
Onthe ground,the aircraft can receive externalACpower through areceptacle located on theforward right sideofthefuselage. The aircraft can also receive externalDCthrough a receptacle located on theaft right sideofthefuselage.
The electricalpower services panel(EPSP)in theflight compartment,andthe external service panelontherightforwardfuselage, contain theACandDCsystemcontrolswitches. The switches are usedfor manualandautomatic control oftheelectricalpower generating systemandexternalpoweroperation.
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