Vol. 1 07--00--1
REV 56, Jan 31/03
ELECTRICAL
Table of Contents
Flight Crew Operating Manual
CSP A--013
MASTER
CHAPTER 7 -- ELECTRICAL
Page
TABLE OF CONTENTS 07--00
Table of Contents 07--00--1
INTRODUCTION 07--10
Introduction 07--10--1
AC ELECTRICAL SYSTEM 07--20
AC Electrical System 07--20--1
Integrated Drive Generator (IDG) 07--20--1
APU Generator 07--20--1
AC Distribution 07--20--1
AC Loads Distribution 07--20--11
Air Driven Generator (ADG) 07--20--12
Systems Circuit Breakers 07--20--14
DC ELECTRICAL SYSTEM 07--30
DC Electrical System 07--30--1
Transformer Rectifier Units (TRU) 07--30--1
Batteries 07--30--1
External DC Power 07--30--5
DC Distribution 07--30--5
DC Loads Distribution 07--30--9
Systems Circuit Breakers 07--30--12
CIRCUIT BREAKER PANELS 07--40
Circuit Breaker Panels 07--40--1
LIST OF ILLUSTRATIONS
INTRODUCTION
Figure 07--10--1 Electrical Power Layout 07--10--3
Figure 07--10--2 Control Panels 07--10--4
AC ELECTRICAL SYSTEM
Figure 07--20--1 AC System Distribution 07--20--3
Figure 07--20--2 AC Electrical System 07--20--4
Figure 07--20--3 AC Electrical System Synoptic Page 07--20--5
Figure 07--20--4 AC Electrical System EICAS
Indications (Generators) 07--20--8
REV 56, Jan 31/03
Vol. 1 07--00--2
ELECTRICAL
Table of Contents
Flight Crew Operating Manual MASTER
CSP A--013
Figure 07--20--5 AC Electrical System EICAS
Indications (Busses) 07--20--9
Figure 07--20--6 Transformer Rectifier Units 07--20--10
Figure 07--20--7 Air Driven Generator (ADG) 07--20--13
DC ELECTRICAL SYSTEM
Figure 07--30--1 DC Distribution System 07--30--3
Figure 07--30--2 DC Electrical System 07--30--4
Figure 07--30--3 DC Electrical System EICAS Indications 07--30--6
Figure 07--30--4 DC Emergency Bus 07--30--7
Figure 07--30--5 External DC Flow Line 07--30--8
CIRCUIT BREAKER PANELS
Figure 07--40--1 Circuit Breaker Panel 1 07--40--2
Figure 07--40--2 Circuit Breaker Panel 1 (Sub--Panel) 07--40--4
Figure 07--40--3 Circuit Breaker Panel 2 07--40--5
Figure 07--40--4 Circuit Breaker Panel 2 (Sub--Panel) 07--40--7
Figure 07--40--5 Circuit Breaker Panel 3 07--40--9
Figure 07--40--6 Circuit Breaker Panel 4 07--40--10
Figure 07--40--7 Circuit Breaker Panel 5 07--40--11
Figure 07--40--8 Miscellaneous Panels 07--40--13
Vol. 1 07--10--1
REV 56, Jan 31/03
ELECTRICAL
Introduction
Flight Crew Operating Manual
CSP A--013
MASTER
1. INTRODUCTION
The aircraft uses both 115 Volts AC and 28 volts DC power. AC electrical power is provided
by two engine-driven generation systems. Each system includes an integrated drive
generator (IDG) and a generator control unit (GCU). An auxiliary power unit (APU)
generator is also available as a back AC power source to replace either or both IDGs.
In the event of total AC power loss, emergency AC power is available from an in-flight
air-driven generator (ADG). The ADG assembly is stowed in a compartment on the right
side of the nose section.
DC power is supplied by five transformer rectifier units (TRU) which rectifies AC input power
into DC output power. Another source of DC power is from a main battery and APU battery.
The main and APU batteries are connected into the aircraft DC electrical power system and
are charged by their respective battery chargers. Power for starting the APU is provided by
the APU battery.
Electrical contactors, switches and relays located throughout 13 junction boxes in the
aircraft, are used for connecting AC and DC power to the appropriate buses and
components. Power connection is dependent on system configuration and health. The
following is a list of all the aircraft electrical system buses:
AC BUSSES DC BUSSES
DC BUS 1
AC BUS 1
DC BUS 2
DC ESSENTIAL BUS
AC BUS 2
DC SERVICE BUS
AC ESSENTIAL BUS
LEFT AND RIGHT BATTERY BUS
AC SERVICE BUS
DC EMERGENCY BUS
ADG BUS
DC UTILITY BUS 1
AC UTILITY BUS 1
DC UTILITY BUS 2
AC UTILITY BUS 2
MAIN BATTERY DIRECT BUS
APU BATTERY DIRECT BUS
On the ground, the aircraft can receive external AC power through a receptacle located on
the forward right side of the fuselage. The aircraft can also receive external DC through a
receptacle located on the aft right side of the fuselage.
The electrical power services panel (EPSP) in the flight compartment, and the external
service panel on the right forward fuselage, contain the AC and DC system control switches.
The switches are used for manual and automatic control of the electrical power generating
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