CL_604-ELECTRICAL庞巴迪挑战者604电气

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CL_604-ELECTRICAL

 

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Table of Contents
For Training Purposes Only
May 03
7-i
P I LOT T R A I N I N G GU I D E ELECTRICAL
Introduction .........................................................................................................................7-1
Alternating Current (AC) System ........................................................................................7-3
Description ....................................................................................................................7-3
Components and Operation..........................................................................................7-4
Integrated Drive Generators (IDGs) ........................................................................7-4
APU Generator........................................................................................................7-6
External AC Electrical Power ........................................................................................7-8
Description ....................................................................................................................7-8
Operation ......................................................................................................................7-8
AC Electrical Power Distribution ....................................................................................... 7-10
Description .................................................................................................................. 7-10
Components and Operation........................................................................................ 7-11
AC BUS 1 and AC BUS 2 ..................................................................................... 7-11
AC ESS (Essential) Bus........................................................................................ 7-13
AC Utility Buses .................................................................................................... 7-14
Air-Driven Generator (ADG).............................................................................................. 7-15
Description .................................................................................................................. 7-15
Components and Operation........................................................................................ 7-16
Air-Driven Generator ............................................................................................. 7-16
ADG Auto Deploy Control Unit.............................................................................. 7-17
ADG Manual Deploy Handle ................................................................................. 7-18
DC Electrical Power System ............................................................................................. 7-20
Description .................................................................................................................. 7-20
Components and Operation........................................................................................ 7-22
Transformer-Rectifier Units (TRUs) ...................................................................... 7-22
TRU Power Distribution System............................................................................ 7-22
Battery Power Distribution System........................................................................ 7-24
External DC Electrical Power ................................................................................ 7-25
Circuit Breakers........................................................................................................... 7-27
Description ............................................................................................................ 7-27
Controls and Indicators ..................................................................................................... 7-30
AC Electrical Power .................................................................................................... 7-30
Air-Driven Generator (ADG)........................................................................................ 7-31
DC Electrical Power .................................................................................................... 7-32
Circuit Breaker Panels ................................................................................................ 7-33
EICAS Synoptic Pages ............................................................................................... 7-37
AC Synoptic Page ................................................................................................. 7-37
DC Synoptic Page................................................................................................. 7-44
EICAS Messages........................................................................................................ 7-50
7-ii For Training Purposes Only
May 03
ELECTRICAL P I LOT T R A I N I N G GU I D E
Page Intentionally Left Blank
List of Figures
Graphic Title Figure
For Training Purposes Only
May 03
7-iii
P I LOT T R A I N I N G GU I D E ELECTRICAL
AC Electrical Power Sources ..............................................................................................7-1
DC Electrical Power Sources..............................................................................................7-2
AC Electrical System ..........................................................................................................7-3
GEN 1 and GEN 2 Power ...................................................................................................7-4
APU Power .........................................................................................................................7-5
External AC Receptacle......................................................................................................7-6
External AC Electrical Power ..............................................................................................7-7
EICAS AC Electrical Synoptic Page ...................................................................................7-8
AC BUS Automatic Transfer ...............................................................................................7-9
AC Essential Bus on Alternate Source ............................................................................. 7-10
AC Utility Bus Shedding.................................................................................................... 7-11
Air-Driven Generator (Wet ADG Shown) .......................................................................... 7-12
ADG Manual Deploy Handle and ADG Auto Deploy Control Panel.................................. 7-13
ADG Operation .................................................................................................................7-14
DC System Schematic ...................................................................................................... 7-15
EICAS DC Electrical Synoptic Page ................................................................................. 7-16
TRU 1 Failed and MAIN BUS TIE Closed......................................................................... 7-17
External DC Receptacle.................................................................................................... 7-18
External DC Power Connected ......................................................................................... 7-19
Circuit Breaker Panels (CBPs).......................................................................................... 7-20
Circuit Breaker Grid System ............................................................................................. 7-21
ELECTRICAL POWER Panel ........................................................................................... 7-22
Air-Driven Generator (ADG).............................................................................................. 7-23
ELECTRICAL POWER Panel ........................................................................................... 7-24
Circuit Breaker Panel 1 ..................................................................................................... 7-25
Circuit Breaker Panel 2 ..................................................................................................... 7-26
Circuit Breaker Panels 3 & 4............................................................................................. 7-27
Circuit Breaker Panel 5 ..................................................................................................... 7-28
AC Synoptic Page Color Coding - Integrated Drive Generators (1 of 2)........................... 7-29
AC Synoptic Page Color Coding - Integrated Drive Generators (2 of 2)........................... 7-30
AC Synoptic Page Color Coding - APU Generator (1 of 2)............................................... 7-31
AC Synoptic Page Color Coding - APU Generator (2 of 2)............................................... 7-32
AC Synoptic Page Color Coding - AC Electrical Power Distribution................................. 7-33
AC Synoptic Page Color Coding - External AC Electrical Power...................................... 7-34
ELECTRICAL
7-iv For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
AC Synoptic Page Color Coding - Air-Driven Generator .................................................. 7-35
DC Synoptic Page - TRU Power Distribution System (1 of 2) .......................................... 7-36
DC Synoptic Page - TRU Power Distribution System (2 of 2) .......................................... 7-37
DC Synoptic Page - Battery Power Distribution System (1 of 2) ...................................... 7-38
DC Synoptic Page - Battery Power Distribution System (2 of 2) ...................................... 7-39
DC Synoptic Page - DC Electrical Power Distribution (1 of 2) .......................................... 7-40
DC Synoptic Page - DC Electrical Power Distribution (2 of 2) .......................................... 7-41
ELECTRICAL
For Training Purposes Only
May 03
7-1
P I LOT T R A I N I N G GU I D E
CHAPTER 7: ELECTRICAL Introduction
The Challenger 604 primarily uses 115-volt AC power and also 28-volt DC electrical
power.
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. Two nickel-cadmium (NiCad) batteries,
located in the aft equipment bay, store and provide a source of DC electrical power for
normal and emergency operations.
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.
ELECTRICAL
7-2 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
AC Electrical Power Sources
Figure 7-1
DC Electrical Power Sources
Figure 7-2
Generator 2
P604_07_001
APU
Generator
Generator 1
Air-Driven
Generator (ADG)
External
Power
Transformer
Rectifier Units
Main Battery
Charger
APU Battery
Main Battery
APU Battery
Charger
External
Power
P604_07_004
ELECTRICAL
For Training Purposes Only
May 03
7-3
P I LOT T R A I N I N G GU I D E
Alternating Current (AC) System
Description
Three AC generators provide AC power for the aircraft electrical systems. Two
engine-driven generators power all AC buses during normal operations. An APU
generator provides a source of AC electrical power when the aircraft is on the ground
with the engines off, and during flight if both engine-driven generators become
inoperative.
AC Electrical System
Figure 7-3
GEN
1
GCU
1
GLC1 GLC2
GTC1 GTC2
AC ESS BUS
TX CONTACTOR
UTILITY
BUS CONTACTOR 1
UTILITY
BUS CONTACTOR 2
ADG
GEN
ADG
GCU
ENG.
1
GEN
2
GCU
2
ENG.
2
APU
EMERG AC TX
CONTACTOR
EXT.
AC
APU
GCU
APU
GEN
EXT
PWR
MON
P604_07_002
NOTE: This schematic only displays AC power sources.
Disregard the position of the GLCs and Generator Transfer Contactors (GTCs).
AC UTILITY ADG BUS
BUS 1
AC BUS 1 AC BUS 2
AC UTILITY
BUS 2
AC
ESS BUS
ELECTRICAL
7-4 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
Integrated Drive Generators (IDGs)
Two engine-driven IDGs supply 115-volt AC, 400-Hz, three-phase electrical power to
the AC buses. The IDG consists of two subcomponents, a constant speed drive and an
electrical generator.
The generators are identified on the EICAS AC Electrical Synoptic page by the
symbols GEN 1 and GEN 2 (see Figure 7-4). The nominal rating of each generator is
30 kilovolt-amperes (kVA) to an altitude of 35,000 feet MSL, then 25 kVA to 41,000
feet MSL. In the event of a single generator failure, the remaining generator is capable
of supplying sufficient power for operation of the main systems.
The generators are controlled by two-position GEN 1 or GEN 2 switches located on
the ELECTRICAL POWER Panel. Selecting GEN 1 or GEN 2 switch to ON connects
the respective generator to the main AC buses provided they are operating normally.
Selecting the switches to OFF/RESET will disconnect the respective generator from
the main AC buses. The OFF/RESET position can also be used to reset the generator
control circuit when a fault occurs.
Generator Control Unit
Each IDG is controlled and monitored by its respective generator control unit (GCU).
The GCUs provide protection and bus priority logic during normal and non-normal
operations. The engine generator is tripped off and removed from the AC buses if any
of the following conditions occur:
• over- and undervoltage
• over- and underfrequency
• generator and bus overcurrent
ELECTRICAL
For Training Purposes Only
May 03
7-5
P I LOT T R A I N I N G GU I D E
GEN 1 and GEN 2 Power
Figure 7-4
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
P604_07_028
4
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
ELECTRICAL
7-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
APU Generator
The APU generator supplies 115-volt AC, 400-Hz, three-phase electrical power to the
AC buses during ground operations with the engines off. The APU generator may also
be used in flight as a backup power source to the AC buses following a failure of both
engine generators. The APU generator is mounted on the APU generator adapter and
is driven at a constant speed, maintaining its frequency output at 400 Hz.
The APU generator is identified on the AC Electrical Synoptic page by the symbol
GEN above the APU icon (see Figure 7-5). The nominal rating of the APU generator
is 30 kVA from sea level up to the APU’s maximum operating altitude of 20,000 feet
MSL.
The two-position APU GEN switch located on the ELECTRICAL POWER Panel
controls the APU generator. Selecting the APU GEN switch to ON connects the APU
generator to the main AC buses, providing it is operating normally. Selecting the
switch to OFF/RESET disconnects the APU generator from the main AC buses. The
OFF/RESET position can also be used to reset the generator control circuit when a
fault occurs.
Use of the APU generator in flight is not permitted unless both
main generators have failed or are off-line.
Generator Control Unit
The APU generator is controlled and monitored by the APU generator control unit
(GCU). The APU GCU in conjunction with the engine GCUs provide protection and
bus priority logic during normal and non-normal operations. The APU GENERATOR
is tripped off and removed from the AC buses if any of the following conditions occur:
• over- and undervoltage
• over- and underfrequency
• generator and bus overcurrent
NOTE
ELECTRICAL
For Training Purposes Only
May 03
7-7
P I LOT T R A I N I N G GU I D E
APU Power
Figure 7-5
P604_07_029
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
0
0
0
GEN
ESS BUS
KVA
V
HZ
0
0
0
KVA
V
HZ
6
113
400
KVA
V
HZ
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
ELECTRICAL
7-8 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
External AC Electrical Power
Description
The aircraft is capable of being powered by an external AC power source when both
engines and APU are off. External AC electrical is connected at a receptacle located
on the forward right side of the fuselage.
External AC Receptacle
Figure 7-6
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 (see Figure 7-7).
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 (AP/EPC).
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 (see Figure 7-7).
P604_07_055
ELECTRICAL
For Training Purposes Only
May 03
7-9
P I LOT T R A I N I N G GU I D E
External AC Electrical Power
Figure 7-7
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
P604_07_031
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
0
0
0
GEN
ESS BUS
KVA
V
HZ
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
EXT
AC
116
400
V
HZ
EXTERNAL AC POWER SUPPLYING MAIN AC BUSES
P604_07_030
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
0
0
0
GEN
ESS BUS
KVA
V
HZ
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
EXT
AC
116
400
V
HZ
EXTERNAL AC POWER CONNECTED TO AIRCRAFT
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
ELECTRICAL
7-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
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 EICAS AC Electrical Synoptic page.
The aircraft AC bus system consists of the following five buses:
• AC BUS 1 (Main)
• AC BUS 2 (Main)
• AC ESS BUS (Essential)
• AC UTILITY BUS 1
• AC UTILITY BUS 2
EICAS AC Electrical Synoptic Page
Figure 7-8
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
P604_07_032
4
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
AC UTILITY BUS 1
AC BUS 1 (Main)
AC ESS BUS (Essential)
AC UTILITY BUS 2
AC BUS 2 (Main)
ELECTRICAL
For Training Purposes Only
Jan 04
7-11
P I LOT T R A I N I N G GU I D E
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 logic 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:
• on-side engine-driven generator (example: AC BUS 1 powered by GEN 1)
• APU generator
• cross-side engine-driven generator (example: AC BUS 1 powered by GEN 2)
• external AC Power
According to the above priority logic, the GLCs and GTCs will automatically tie the
main AC buses to any of the available AC power sources, to ensure the main AC buses
remain powered at all times.
AC BUS 1(2) Automatic Transfer (AUTOXFER) Switch/Lights
The flight crew may manually inhibit the automatic bus transfer priority logic by
pressing the appropriate AUTOXFER switch/light located on the ELECTRICAL
POWER Panel. This prevents the corresponding AC BUS from being powered by any
source except its on-side engine-driven generator. This may be used to isolate a main
AC bus in the event of an electrical emergency (example: electrical smoke or fire).
Selection of the AUTOXFER switch/light is indicated by illumination of the
corresponding white OFF annunciator on the switch/light and the white AUTO XFER
OFF icon on the AC Electrical Synoptic page (see Figure 7-9).
Should a bus fault or generator overcurrent condition occur on a main AC bus, the
automatic bus transfer priority logic will be inhibited, isolating the fault from the
remaining AC electrical system. This condition is indicated by the AC 1(2)
AUTOXFER caution EICAS message, illumination of the corresponding amber FAIL
annunciator on the AUTOXFER switch/light, and the amber AUTO XFER FAIL icon
on the AC Synoptic page (see Figure 7-9).
ELECTRICAL
7-12 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
AC BUS Automatic Transfer
Figure 7-9
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
P604_07_034
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
AUTO
XFER
FAIL
SHED
AC BUS 2 AUTOMATIC TRANSFER FAILURE
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
P604_07_033
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
4
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
AUTO
XFER
OFF
AC BUS 2 AUTOXFER SWITCH/LIGHT SELECTED OFF
ELECTRICAL
For Training Purposes Only
May 03
7-13
P I LOT T R A I N I N G GU I D E
AC ESS (Essential) Bus
The AC ESS BUS supplies power to the equipment essential for flight. It is normally
powered by AC BUS 1, but may also be powered by AC BUS 2 or the ADG BUS. The
AC ESS BUS supplies power to ESS TRU 1, which provides DC power to the DC
ESS BUS and the BATT BUS.
Refer to the ADG section in this chapter for information on the ADG BUS.
AC ESS Bus Transfer
If a loss of power on AC BUS 1 is sensed, the AC ESS BUS is automatically
transferred to AC BUS 2. When an automatic transfer to AC BUS 2 occurs, the AC
ESS XFER switch/light located on the ELECTRICAL POWER Panel illuminates and
the AC ESS ALTN status EICAS message appears (see Figure 7-10).
If the automatic transfer fails to occur, the AC ESS BUS can be manually transferred
to AC BUS 2 by pressing the AC ESS XFER switch/light.
AC Essential Bus on Alternate Source
Figure 7-10
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
P604_07_035
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
2
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
AUTO
XFER
FAIL
ELECTRICAL
7-14 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
AC Utility Buses
AC UTILITY BUS 1 and 2 receive power from AC BUS 1 and 2 respectively. The AC
utility buses supply AC power to nonessential cabin equipment.
Utility Bus Shedding
During single-generator operation in flight, AC UTILITY BUS 1 and 2 are
automatically load shed to reduce the electrical load on the remaining generator.
During ground operations, AC UTILITY BUS 1 and 2 are load shed when a single
generator (or external AC power only) is supplying AC power and the flaps are not
retracted.
Load shedding of AC UTILITY BUS 1 and 2 is indicated by the appearance of AC
UTIL 1(2) OFF status EICAS messages and the SHED icons on the AC Electrical
Synoptic page (see Figure 7-11).
AC Utility Bus Shedding
Figure 7-11
P604_07_036
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
7
113
401
KVA
V
HZ
AUTO
XFER
FAIL
SHED SHED
AC UTIL 2 OFF
AC UTIL 1 OFF
EICAS SECONDARY
DISPLAY
ELECTRICAL
For Training Purposes Only
Jan 04
7-15
P I LOT T R A I N I N G GU I D E
Air-Driven Generator (ADG)
Description
The ADG provides 115-volt, 400-Hz, 15-kVA power to the AC ESS BUS and 3B
hydraulic pump, in the event of a complete loss of AC power in flight. The ADG is
located in the forward right fuselage beside the nose gear and is deployed
automatically or manually. Once deployed, the ADG can only be restowed when the
aircraft is on the ground (see Figure 7-12).
Air-Driven Generator (Wet ADG Shown)
Figure 7-12
ADG Ground
Safety Lockpin
UPLOCK ASSEMBLY
Auto Release
( Squib Cartridge
Solenoid)
Wet ADG - /
Dry ADG -
P604_07_003
Manual
Release
Ejection
Jack
Assembly
Manual
Restowable
Pump Assembly
Air-Driven
Generator
Assembly
Ejection
Jack
Assembly
Manual
Retraction
Pump
Assembly
AIR - DRIVEN DRY GENERATOR
(Aircraft 5408 and subsequent)
AIR - DRIVEN WET GENERATOR
(Aircraft 5301 to 5407)
Air-Driven
Generator
Assembly
ELECTRICAL
7-16 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
Air-Driven Generator
The ADG consists of an AC generator mounted on a pivoted support leg and a
variable-pitch two-bladed propeller that turns in the airstream. There are two versions
of the ADG.
Airplanes 5301 to 5407
On airplanes 5301 to 5407, constant speed of the generator is achieved by
hydraulically controlling the propeller pitch angle. This ADG is commonly referred to
as the “wet ADG”. Wet ADG operation is airspeed-limited (refer to the Airplane
Flight Manual Limitations).
On landing with the wet ADG deployed, use gentle deceleration
to prevent the ADG from swinging forward and contacting the
fuselage.
Airplane 5408 and Subsequent
On airplanes 5408 and subsequent, the constant speed of the ADG is achieved by
using a counterweight system to control the propeller pitch angle. This ADG is
commonly referred to as the “dry ADG”.
ADG Generator Control Unit
The ADG generator is controlled and monitored by the ADG generator control unit
(GCU). The ADG GCU provides the following functions:
• monitors and controls ADG voltage output
• protects against overvoltage, overfrequency and underfrequency to the ADG BUS
• provides a signal to the ADG Auto Deploy Control Unit to energize the HYD
PUMP 3B Transfer Contactor, Emergency AC Transfer Contactor, and Emergency
DC Transfer Contactor when the ADG voltage and frequency are within limits
NOTE
ELECTRICAL
For Training Purposes Only
May 03
7-17
P I LOT T R A I N I N G GU I D E
ADG AUTO DEPLOY CONTROL Unit
Located on the lower center pedestal, the ADG AUTO DEPLOY CONTROL Unit
controls the automatic deployment of the ADG.
Automatic deployment of the ADG occurs when:
• both AC BUS 1 and AC BUS 2 become unpowered
• the aircraft is in flight
Another ADG deployment prerequisite is that one of the three main generators must
be on line prior to both AC main buses going off (this prevents the ADG from
deploying during ground maintenance tests with external power being connected and
disconnected with the aircraft on jacks.
The red EMER PWR ONLY warning EICAS message appears to indicate loss of all
normal electrical power and ADG deployment.
When the ADG unit is fully extended, the two-blade propeller is unlocked and rotates
in the airstream. Once the ADG voltage and frequency are within normal limits, the
AUTO DEPLOY CONTROL Unit energizes the appropriate transfer contactors, and
allows the ADG to provide power to the AC ESS BUS and to hydraulic pump 3B via
the ADG BUS.
Airplanes 5301 to 5407
On airplanes 5301 to 5407, the ADG AUTO DEPLOY CONTROL Unit deploys the
ADG by sending an electrical signal to fire the squib cartridge in the ADG uplock
mechanism.
Airplane 5408 and Subsequent
On airplanes 5408 and subsequent, the ADG AUTO DEPLOY CONTROL Unit sends
a signal to release the solenoid of the ADG uplock mechanism.
ADG Manual Deploy Handle and ADG AUTO DEPLOY CONTROL Panel
Figure 7-13
ADG PWR TXFR
OVERRIDE
UNIT
ADG AUTO DEPLOY
CONTROL
LAMP
TEST
P604_07_041
ELECTRICAL
7-18 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
PWR TXFR OVERRIDE
With the ADG deployed, it may be possible to restore normal AC electrical power by
resetting an engine-driven generator or by using the APU generator. If AC electrical
power is restored, the PWR TXFR OVERRIDE switch (see Figure 7-13) should be
selected to reset the three transfer contactors and regain normal AC distribution. This
returns the AC ESS BUS to AC BUS 1 and the 3B hydraulic pump to normal
operation.
The ADG Manual Deploy Handle must be stowed to allow the
transfer contactors to reset.
ADG LAMP / UNIT Switch
The ADG Auto Deploy Control Unit may be tested using the two-position ADG
LAMP / UNIT switch located on the ADG AUTO DEPLOY CONTROL Panel.
Selecting the switch to the UNIT position tests the continuity of the uplock circuit, the
three transfer contactors, and the ADG AUTO DEPLOY CONTROL Unit internal
logic circuitry. Both engine generators must be operating and AC BUS 1 and AC BUS
2 must be powered to ensure a proper test.
Selecting the switch to the LAMP position checks the serviceability of the green TEST
lamp only.
ADG Manual Deploy Handle
In the event of an auto-deploy failure, the ADG can be manually deployed using the
ADG Manual Deploy Handle located on the lower center pedestal. Pulling the handle
manually releases the uplock that allows the ADG to deploy. In addition, the
Emergency AC Transfer Contactor and Emergency DC Transfer Contactor are
energized immediately.
In the event the ADG fails, operating the ADG Manual Deploy Handle enables the DC
ESS BUS to be supplied by the BATT BUS through the Emergency DC Transfer
Contactor.
If the ADG is not operating properly and the airplane is on battery
power only, then all electrical power may be lost after 30
minutes.
Hydraulic pump 3B will be inoperative when on battery power.
NOTE
NOTE
ELECTRICAL
For Training Purposes Only
May 03
7-19
P I LOT T R A I N I N G GU I D E
Manual deployment of the ADG handle is also required for landing when the ADG is
the only source of AC electrical power. This ensures that the DC ESS BUS remains
powered by the BATT BUS throughout the landing rollout, when the ADG is no
longer capable of generating AC power.
ADG Operation
Figure 7-14
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
P604_07_037
4
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
9
113
400
KVA
V
HZ
AUTO
XFER
FAIL
SHED SHED
ADG
ESS BUS
115
400
V
HZ
ADG 115
400
V
HZ
ESS BUS
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
10
113
400
KVA
V
HZ
AUTO
XFER
FAIL
SHED SHED
ADG 115
400
V
HZ
ESS BUS
1. NORMAL OPERATION 2. EMER PWR ONLY – ADG DEPLOYED
3. APU GEN SELECTED ON 4. PWR TXFR OVERRIDE PRESSED
ELECTRICAL
7-20 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
DC Electrical Power System
Description
Four transformer-rectifier units (TRUs), two NiCad batteries and an external DC
power receptacle supply direct current (DC) power to the DC buses. The TRUs carry
the majority of the DC electrical loads and the batteries provide emergency power inflight
and allow the APU to be started on the ground.
DC power is distributed to the DC buses directly from the TRUs or batteries, and from
various contactors which provide alternate sources of power.
Electrical power is supplied to the buses through the circuit breaker panels.
DC System Schematic
Figure 7-15
APU
BATT
EXT
DC
TRU 1 TRU 2 ESS TRU 2 ESS TRU 1
APU
BATT
CHGR
FROM
ADG
DC TIE
RELAY 1
DC TIE
RELAY 2
DC ESS
SOLID-STATE
CONTACTOR
APU BATT
SOLID-STATE
CONTACTOR
EXTERNAL
DC
CONTACTOR
EMERGENCY
DC TX
CONTACTOR
MAIN
BATT
MAIN BATT
SOLID STATE
CONTACTOR
MAIN
BATT
CHGR
P604_07_005
NOTE: This schematic only displays DC power sources.
Disregard the positions of all contactors and ties.
DC UTILITY
BUS 2
DC UTILITY
BUS 1
DC BUS 1
DC BUS 2
DC
ESS BUS
BATT BUS
EMERGENCY
BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2
AC
ESS BUS
ELECTRICAL
For Training Purposes Only
May 03
7-21
P I LOT T R A I N I N G GU I D E
Monitoring of system status is done using the EICAS DC Electrical Synoptic page.
The aircraft DC bus system consists of the following nine buses:
• DC BUS 1
• DC BUS 2
• DC ESS (Essential) BUS
• DC EMER (Emergency) BUS
• BATT (Battery) BUS
• DC UTIL (Utility) BUS 1
• DC UTIL (Utility) BUS 2
• MAIN BATTERY DIRECT BUS
• APU BATTERY DIRECT BUS
EICAS DC Electrical Synoptic Page
Figure 7-16
P604_07_038
DC ELECTRICAL
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
28 V
8 A
TRU 2
28 V
13 A
ESS
TRU 2
28 V
24 A
ESS
TRU 1
28 V
24 A
MAIN
BATT
26 V
0 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
DC BUS 1
DC BUS 2
DC UTIL (Utility) BUS 1
DC UTIL (Utility) BUS 2
DC ESS (Essential) BUS
BATT (Battery) BUS
APU BATTERY
DIRECT BUS
MAIN BATTERY
DIRECT BUS
DC EMER (Emergency) BUS
ELECTRICAL
7-22 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
Transformer-Rectifier Units (TRUs)
The normal sources of 28-volt DC electrical power for the DC system are the four
TRUs. Each TRU converts 115-volt AC to 28-volt DC and supplies it to its respective
DC buses. Each TRU is rated at 100 amps.
The four TRUs are identified as:
• TRU 1
• TRU 2
• ESS (Essential) TRU 1
• ESS (Essential) TRU 2
The TRUs supply the following buses:
• TRU 1 normally supplies DC BUS 1 and DC UTIL BUS 1
• TRU 2 normally supplies DC BUS 2 and DC UTIL BUS 2
• ESS TRU 1 normally supplies DC ESS BUS and DC BATT BUS
• ESS TRU 2 normally supplies DC ESS BUS and DC BATT BUS
TRU Power Distribution System
The TRU Power Distribution System supplies the following buses:
DC BUS 1 and DC BUS 2
DC BUS 1 is supplied by TRU 1 and DC BUS 2 is supplied by TRU 2. If either TRU
fails, both buses can be supplied by either TRU by selecting the MAIN BUS TIE
switch/light on the ELECTRICAL POWER Panel (see Figure 7-17).
DC ESS BUS
The DC ESS BUS powers equipment essential for safe flight, and therefore, may be
supplied by numerous DC sources to ensure redundancy of its power supply.
Normally, ESS TRU 1 and ESS TRU 2 power the DC ESS BUS. In the event of a
single ESS TRU failure, either ESS TRU is capable of sustaining the DC ESS BUS
load. Should both ESS TRUs fail with the aircraft in flight, the APU BATT DIR BUS
through the DC ESS solid-state contactor will power the DC ESS BUS.
During ADG operation, the AC ESS BUS powers ESS TRU 1 which in turn powers
the DC ESS BUS. The DC ESS BUS can also be powered by the APU and Main
batteries through the Emergency DC Transfer Contactor. Refer to the ADG section of
this chapter for additional information.
ELECTRICAL
For Training Purposes Only
May 03
7-23
P I LOT T R A I N I N G GU I D E
TRU 1 Failed and MAIN BUS TIE Closed
Figure 7-17
BATT BUS
The BATT BUS powers equipment essential for safe flight, and may be supplied by
several DC sources to ensure redundancy. Normally, ESS TRU 1 and ESS TRU 2
power the BATT BUS when the main AC buses are powered. If the ESS TRUs are not
operating (no AC power or ESS TRU failures), the BATT BUS will be powered by the
APU BATT DIR BUS and MAIN BATT DIR BUS provided the BATT MASTER
Switch is selected ON.
The BATT MASTER Switch located on the ELECTRICAL POWER Panel controls
the APU BATT and MAIN BATT contactors to supply the BATT BUS, as described
above.
The BATT BUS also supplies the DC EMER BUS.
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
P604_07_039
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
– – V
0 A
TRU 2
28 V
20 A
ESS
TRU 2
28 V
24 A
ESS
TRU 1
28 V
24 A
MAIN
BATT
26 V
0 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
DC ELECTRICAL
ELECTRICAL
7-24 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
DC UTIL BUS 1 and DC UTIL BUS 2
The DC UTIL buses supply power to nonessential cabin equipment. TRU 1 and
TRU 2 power DC UTILITY BUS 1 and 2 respectively.
Whenever the MAIN BUS TIE switch/light is selected following a TRU 1 or 2 failure,
the DC UTIL buses are load shed to reduce the DC electrical load.
Battery Power Distribution System
The Battery Power Distribution System represents a small portion of the aircraft’s total
DC load. The batteries primarily provide the energy needed to start the APU, which
can then be used to supply AC power to the aircraft. The batteries also supply
emergency DC power in-flight should all AC power be lost and the ADG become
inoperative.
Two rechargeable nickel-cadmium (NiCad) batteries are installed in the aft equipment
bay. The main battery is a 24-volt, 17-amp/hour battery. The APU battery is a 24-volt,
43-amp/hour battery.
The batteries supply DC electrical power to the following buses:
• MAIN BATT DIR BUS
• APU BATT DIR BUS
• DC EMER BUS
• BATT BUS
Battery Charging
The main battery charger and APU battery charger are in a charging configuration at
all times when the applicable main AC buses are powered:
• AC BUS 1 for Main Battery Charger
• AC BUS 2 for APU Battery Charger
The battery chargers operate automatically in various modes based on battery
temperatures. Should a battery or battery charger fault be detected, the respective
battery charger will shut down. A MAIN (APU) BATT CHGR FAIL status EICAS
message will appear and the CHGR OFF icon will be displayed on the DC Electrical
Synoptic page to indicate a failure.
ELECTRICAL
For Training Purposes Only
May 03
7-25
P I LOT T R A I N I N G GU I D E
MAIN and APU BATT DIR BUSES
These DC buses are continuously powered from the associated battery, regardless of
the BATT MASTER switch position. The main battery is connected to the MAIN
BATT DIR BUS and the APU battery is connected to the APU BATT DIR BUS. These
buses provide power to the aircraft systems which primarily relate to ground service
operation (refueling, service lights, etc.). The APU BATT DIR BUS also supplies the
DC EMER BUS.
DC Emergency Bus
The DC EMER BUS provides power to the engine and APU fire extinguishers and the
fuel and hydraulic shutoff valves. The bus is connected to the APU BATT DIR BUS
and the BATT BUS and is continuously powered.
BATT BUS
Refer to the TRU distribution section of this chapter.
External DC Electrical Power
External DC ground power may be used to start the APU if the APU battery charge is
low. The External DC receptacle is located at the rear of the aircraft near the right
engine pylon (see Figure 7-18).
External DC Receptacle
Figure 7-18
P604_07_056
ELECTRICAL
7-26 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
When connected, external DC ground power automatically supplies the APU BATT
DIR BUS through the External DC contactor, and the BATT BUS when the BATT
MASTER switch is selected ON. The DC EXTERNAL POWER white IN USE light
on the ELECTRICAL POWER panel illuminates whenever DC external power is
connected.
External DC ground power is identified on the DC Electrical Synoptic page by the
symbol EXT DC. This symbol appears only if DC external power is connected to the
aircraft.
External DC Power Connected
Figure 7-19
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
P604_07_040
DC ELECTRICAL
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
0 V
0 A
TRU 2
0 V
0 A
ESS
TRU 2
0 V
0 A
ESS
TRU 1
0 V
0 A
MAIN
BATT
24 V
18 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
ELECTRICAL
For Training Purposes Only
May 03
7-27
P I LOT T R A I N I N G GU I D E
Circuit Breakers
Description
Electrical power distribution is accomplished through five circuit breaker panels. Four
circuit breaker panels are installed in the flight deck and the fifth panel is in the aft
equipment bay. They are identified as follows (see Figure 7-20):
• Circuit Breaker Panel 1 (CBP-1)
• Circuit Breaker Panel 2 (CBP-2)
• Circuit Breaker Panel 3 (CBP-3)
• Circuit Breaker Panel 4 (CBP-4)
• Circuit Breaker Panel 5 (CBP-5)
Electrical equipment protection is provided by conventional thermal circuit breakers.
When a circuit breaker is tripped, a white collar is exposed. Depending on airplane
completion specification, circuit breakers may also be located in other parts of the
airplane. Should a circuit breaker trip while the airplane is in flight, the circuit breaker
should be allowed to cool for as long as possible before resetting.
Do not attempt more than one reset of a circuit breaker.
NOTE
ELECTRICAL
7-28 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Circuit Breaker Panels (CBPS)
Figure 7-20
CBP-3 CBP-4
CBP-2 CBP-1
CBP-1
(LOWER)
CBP-5
AC ESS
BUS
DC ESS
BUS
AC BUS 2
DC BUS 2
BATT BUS
AC BUS 1
DC BUS 1
BATT BUS
EMERGENCY
MAIN BATT
DIR BUS
APU BATT
DIR BUS
P604_07_011
ELECTRICAL
For Training Purposes Only
May 03
7-29
P I LOT T R A I N I N G GU I D E
Circuit Breaker Grid System
A circuit breaker can be located, when called for in a procedure, by using the grid
reference on the circuit breaker panel.
For example, the “VOLTS & FREQ IND” circuit breaker location is identified as
(3A13), and therefore found on panel CBP-3, row A, column 13 (see Figure 7-21).
Circuit Breaker Grid System
Figure 7-21
CBP-3
ESS
TRU
1
STAB CH 2
HSTA
ESS HYD
PUMP
SUPPLY
VOLTS
& FREQ
IND
AC
ESS
FEED
L
DET
L
PITOT
PITOT
STBY
L
AOA
L
STATIC
R
DET
L
HTR
WIND
CTR
PNLS
CB
PNLS
PLT
PNLS
O/H
PNLS
IRU
1 TCAS
ICE
DET
1
ENG
IGN
A
IRU
FAN
1
FDR
PWR
SURF
POS
IND L
26 VAC
ESS
XFMR
A
B
C
D
115VAC ESS BUS
115VAC ESS BUS
115VAC ESS BUS
26VAC ESS BUS 115VAC ESS BUS
115VAC ADG BUS
B/LEAK HEATERS INTEG LTS
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
10
3 3 3
3 3 5 3
2 2
3
3 10 5 5 3 5 3 5
7.5 25 25 1
Row
Circuit Breaker
Panel Number Column
P604_07_006
ELECTRICAL
7-30 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Controls and Indicators
The overhead ELECTRICAL POWER Panel and the Air-Driven Generator (ADG)
panel provide the system controls. The EICAS (AC Electrical and DC Electrical)
Synoptic pages provide a pictorial representation of system status. The EICAS
Primary and Secondary pages provide system caution and advisory messages
respectively. Circuit Breaker Panel (CBP) diagrams are also located in this section.
AC Electrical Power
ELECTRICAL POWER Panel
Figure 7-22
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
External AC Power Switch/Light (alternate-action)
Push
AVAIL Light
Illuminated
IN USE Light
Illuminated
– Connects external AC power to appropriate
main AC BUS(s) when the AVAIL light is illuminated.
– Indicates that external AC power is
connected and operating within limits.
– Indicates external AC power is connected
and supplying the appropriate main AC BUS(s).
AC ESS XFER Switch/Light (alternate-action)
Push
ALTN Light
Illuminated
– Manually transfers source of power for
AC ESS BUS from AC BUS 1 to AC BUS 2.
– Indicates AC ESS BUS is being
supplied from AC BUS 2.
AC AUTOXFER Switch/Lights (alternate-action)
Push
OFF Light
Illuminated
FAIL Light
Illuminated
– Disables automatic bus tie operation for
corresponding main AC BUS (left AC BUS 1,
right AC BUS 2).
– Indicates automatic bus tie operation has
been manually disabled.
– Indicates automatic bus tie operation has
been automatically disabled due to a bus fault or
generator overcurrent condition.
P604_07_025
GEN 1 (2) Switch
ON
OFF/RESET
– Connects applicable
generator to appropriate
main AC BUS(s) provided it
is operating normally.




Disconnects applicable
generator from main AC
BUS(s).
Resets generator control
circuit.
APU GEN Switch
ON
OFF/RESET
– Connects APU
generator to appropriate
main AC BUS(s) provided it
is operating normally.
: The APU GEN
generator may not be
selected ON in flight, unless
both GEN 1 and GEN 2 are
off-line or failed.
NOTE




Disconnects APU
generator from main AC
BUS(s).
Resets generator control
circuit.
ELECTRICAL
For Training Purposes Only
May 03
7-31
P I LOT T R A I N I N G GU I D E
Air-Driven Generator (ADG)
Air-Driven Generator (ADG)
Figure 7-23
ADG PWR TXFR
OVERRIDE
UNIT
ADG AUTO DEPLOY
CONTROL
LAMP
TEST
P604_07_027
ADG Manual Deploy Handle
Pull aft until latched:




Manually releases ADG
uplock mechanism to deploy
the ADG.
Immediately energizes the
Emergency AC Transfer
Contactor, Emergency DC
Transfer Contactor and the
Hydraulic Pump 3B Transfer
Contactor.
ADG LAMP-UNIT Test Switch
LAMP
UNIT:
– Tests the ADG TEST LAMP.
Tests continuity of the ADG uplock release
circuit and of the Emergency AC, DC and,
Hydraulic Pump 3B Transfer Contactors.
Tests the auto-deploy control unit logic circuits.




PWR TXFR OVERRIDE Switch
Push – De-energizes the
Emergency AC Transfer Contactor,
Emergency DC Transfer Contactor
and Hydraulic Pump 3B Transfer
Contactor if power is restored to
the main AC buses.
: ADG Manual Deploy
Handle must be stowed for all
transfer contactors to de-energize.
NOTE
ADG TEST LAMP
During LAMP Test
During UNIT Test






Illuminates steady.
On the ground, illuminates after 2
seconds for 2 seconds.
In-flight, illuminates after 5 seconds
for 2 seconds.
ELECTRICAL
7-32 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
DC Electrical Power
ELECTRICAL POWER Panel
Figure 7-24
ELECTRICAL POWER
BATT MASTER EXT. POWER
APU GEN GEN 2
OFF/
RESET
OFF/
RESET
ON
ON
OFF
ESS. POWER DC POWER
AC ESS XFER MAIN BUS TIE
AC POWER
GEN 1
OFF/
RESET
AVAIL
IN USE
IN
USE
ON
AUTOXFER
FAIL
OFF
FAIL
OFF
ALTN CLOSED
ON
AC DC
BATT MASTER Switch
ON
OFF
– Connects the batteries (MAIN BATT DIR BUS and
the APU BATT DIR BUS) to the BATT BUS.
– Disconnects the batteries from the BATT BUS.
MAIN BUS TIE Switch/Light (alternate-action)
Push
CLOSED Light
Illuminated
– Ties DC BUS 1 and DC BUS 2 together.
– Indicates that both DC BUS 1 and
DC BUS 2 have been tied together.
: Both DC utility buses are load shed
whenever the switch/light indicates CLOSED.
NOTE
P604_07_026
External DC Power Light
Illuminated – Indicates
external DC power is
connected to the aircraft
and is supplying the APU
BATT DIR BUS.
ELECTRICAL
For Training Purposes Only
May 03
7-33
P I LOT T R A I N I N G GU I D E
Circuit Breaker Panels
Circuit Breaker Panel 1
Figure 7-25
3
10
7.5
7.5 7.5
7.5 7.5
7.5
7.5
7.5
7.5 7.5
7.5 7.5
7.5
7.5 7.5 7.5
7.5 7.5 7.5
3
3
3 3 3 5 7.5
3
3 3 3
50 50 50
3 3 3 3 3 3 3
3
3
3 3
20 5 3 3 20 3
3
3
3
3
3
3
3
3
3
3 3 3 3
3
3
3
5 3
3
3
3
3
5 5 5 5
3
3
3
3
3
3
3
3
3
3 3
3 3 5 3 5 5
3 10
10 10
3 10 3 3 3 3
3
5
5 5
25 7.5 20 20
5 3 3 3
25
25
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
7
7
7
7
8
8
8
8
9
9
9
9
10
10
10
10
11
11
11
11
12
12
12
12
13
13
13
13
14
14
14
14
15
15
15
15
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14 15
WOW/
GEAR/
SPLR 1
DISP
FAN
CONT
FLAP
CONT
1
GND
SPLR
RUD
TRIM
NOSE
STEER
ANTI
SKID
CKPT
HTR
CONT
A/ICE
AUTO
1
14 ST
B/AIR
SOV L
14 ST
B/AIR
ISOL
SOV
HTR
CONT
L WSHLD
B
C
D
E
F
G
H
POWER MUST BE OFF BEFORE OPENING PANEL CBP-1
HYD PUMP
115 VAC BUS 1
115 VAC BUS 1
115 VAC BUS 1
115 VAC BUS 1 115 VAC UTILITY BUS 1
HEATERS
3B 2B TAT
AUX
AOA
L
WSHLD
CKPT
HTR
TRU
1
IRU
3
IRU 3
GPWS FAN
FLAP
MOTOR
1
115VAC
ESS
FEED
MAIN
BATT
CHGR
ENG
VIB
MON
PASS
WARN
SIGNS
CKPT
FAN
ADG
DEPLOY
SENSE
LDG/TAXI LTS
L
NOSE
L
WING
NAV
LTS
PWR
SENSE
LIGHT
LOGO
GAL/LAV
SUPPLY
LINE HTRS
FUEL PUMP
PRIM XFER
DISP
FAN
28 VDC UTILITY BUS 1
28 VDC UTILITY BUS 1
PWR
SENSE FEED FEED
DC BUS 1 CONTROL
TIE &
UTIL
TRU 1
SENSE
UTIL
BUS
CONT
PWR
SENSE
28 VDC BUS 1
CKPT TEMP CONT
AUTO
HYD SYST
AC PUMP
CONT 2
FSCU
PRIM FUEL
XFER CONT
FUEL
DEFUEL
SOV POS
LIGHTS
CHRT
HLDR
WING
INSP
CKPT
FLOOR
REAR
A/COLL
SELCAL
L
LDU
PRIM
DISPL
SEC
DISPL
DME
1 AFIS
RAD
ALT
1
GPS
1
BRT/DIM PWR SUPP
2 3
28 VDC BUS 1
28 VDC BUS 1
EICAS
IND
2
1
1
1
2 3
2 3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14 1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7
3
M
J
K
L
N
P
Q
1
1 2 3 4 5 6 7 8 9 10 11 12
2 4
28 VDC BUS 1
28 VDC BATTERY BUS
28 VDC BATTERY BUS 1
WEATHER RDR HF COMM 1
R/T CONT 1 CONT 2 TX/RX
L IAPS
AFCS 2
FMS 1 CPL
ECU
FAULT
ANN
START
CONT
L OIL
PRESS
TRANS
ENG IGN
A B
ENG START
R
R
EMERG
BUS
FEED
FMS 1
BACKUP
PWR
FMS
CDU
1
WOW/
GEAR/
SPLR 1
LH
CH
STALL PROT
STICK
PUSH
FLAP
TRIM
IND
ENG JET
PIPE OVHT
FIRE DETECTORS
R
ENG
L
ENG APU TEST
FUEL
L PUMP
CONT
GRAV
L PUMP XFLOW
FSCU
CH 1
L
L
APU
GCU
1 2
28 VDC BATTERY BUS
28 VDC BATTERY BUS
28 VDC BATTERY BUS
ADC 2
STBY PA
PLT
MAP DOME
STBY
INSTR
LIGHTS
C/PLT
MAP
O/H
PNLS
RTU
1
STBY
HORIZ
EICAS
RTU/CDU
DIMMING
IRU
BATT 1
IRU
PLT C/PLT BATT 3
VHF AUDIO
COMM
1
FDR
CONT
L IAPS
AFCS 1
MDC
L IAPS
FAN
ESS AC
XFER
CONT
3
A
7.5
POWER MUST BE OFF BEFORE OPENING PANEL CBP-1
R
S
T
TEST
NORM
OFF
MAINT ADSHC
MFD 1
MFD 2
FIRE
EXT 2
R ENG R ENG
R ENG
FIRE
EXT 1
APU
FIRE
EXT
PWR
SENSE
FEED
L ENG L ENG
L ENG R ENG L ENG
28 VDC EMERGENCY BUS
28 VDC EMERGENCY BUS
APU
FUEL SOV HYD SOV
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
3 3 3 3 20
3
3
7.5 7.5 7.5 7.5
CIRCUIT BREAKER PANEL CBP - 1
CIRCUIT BREAKER PANEL CBP - 1
(LOWER)
P604_07_013
ELECTRICAL
7-34 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Circuit Breaker Panel 2
Figure 7-26
3
3
EFIS 2
PFD MFD
CONT
PNL CH A CH B
BATT
BUS PWR
SENSE
MAIN
BATT
DC
ESS
BATT
BUS
FEED 1
DC
ESS
BATT
BUS
DC ESS & BATT BUS CONTROL
28 VDC BUS 2
RCCB CONT
APU
BATT
CONTACTOR
LOGIC
ESS TRUS
WOW/
GEAR/
SPLR 2
DOOR
WARN
ADG DEPLOY
CONT
28 VDC BATTERY BUS
A/ICE
VALVE
A/ICE
MAN
2
FEED 2
DC
ESS
R IAPS
AFCS 2
FMS 2
BAG
BAY
SMOKE
ADC
2
CLOCK
1
ESS TRU 1
SHUNT FUSES
HYD SYST
PUMP
CONT 3B
IND
3
APU
FUEL
PUMP
CREW/PASS
OXYGEN
IRU
BATT 2
STBY
ALTM
RAM
AIR
SOV
FUEL
X FEED
CONT
T/T DUMP
SOV
CONT
T/T
DUMP
SOV
DCU 1 DCU 2
1 2 CH A CH B CH A
CONT
PNL
R
LDU
PRIM
DISPL
SEC
DISPL
BRT/DIM PWR SUPP
1 2
MLG BAY
OVHT
DET
CABIN
PRESS
CONT AUTO MAN
28 VDC BATTERY BUS
28 VDC BUS 2
EICAS
28 VDC BATTERY BUS
L ENG R ENG
F5PA F6PA
ESS TRU 2
SHUNT FUSES
F11PA F12PA
EICAS
3 CH B
1A
SPARE
M
J
K
L
N
P
Q
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8 9 10 11 12
50 50 50 50
20
10 10
3 3 3
3
3 3
3 3 3
3 3 3 3
5 3 3
3 3 3 3 3 3 3
0.5 0.5 0.5
1 2 3 4 5 6 7 8 9 10 11 12
5
5
1 2 3 4 5 6 7 8 9 10
10 3
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4
1 2 3 4 5 6 7 8 9 10 11 12
26 VAC BUS 2 115 VAC UTILITY BUS 2
STAB CH 1
HSTA
26VAC
XFMR
ICE
DET
2
CABIN
FAN
ADG
DEPLOY
SENSE
INTEG
LTS
C/PLT
PNLS
LDG/TAXI LTS
POWER
SENSE
LINE HTRS
DRAIN
GAL/LAV
SUPPLY
TANK
SURF
POS
IND R
FUEL PUMP
PRIM XFER
WOW/
GEAR/
SPLR 2
FLAP
CONT
2
GND
SPLR
AIL
TRIM
NOSE
STEER
ANTI
SKID
STAB
CH 1
HSTCU
R AIR
COND
CONT
A/ICE
AUTO
2
10 ST
B/AIR
SOVR
14 ST
B/AIR
SOVR
HYD SYST
28 VDC BUS 2
AC PUMP
CONT 1
IND
2
AC PUMP
CONT 3A
R FUEL
PUMP
CONT
R
FUEL
PUMP
SEC FUEL
XFER
CONT
BRAKE
PRESS
IND
LIGHTS
BEACON
ADS
HTR R
CONT
HTR CONT
R
WSHLD
R
WIND
LIGHTS
WING
A/COLL
DME
2
ADF
2
RAD
ALT
2
VHF
NAV
2
RTU
2
GPS
2
FMS
CDU
2
XPDR
2
LIGHTING
SENSOR
VHF
COMM
2
115 VAC BUS 2
R
NOSE
R
WING
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
A
B
C
D
E
F
G
H
POWER MUST BE OFF BEFORE OPENING PANEL CBP-2
HYD PUMP
115 VAC BUS 2
HEATERS
3A 1B
R
WIND
R
AOA
R
PITOT
R
STATIC
R
WSHLD
ESS
TRU
2
115 VAC BUS 2
TRU
2
IRU
2
FLAP
MOTOR
2
115VAC
ESS
FEED
IRU
FAN
2
115 VAC BUS 2
APU
BATT
CHGR
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
28 VDC UTILITY BUS 1
PWR
TX/RX CPL SENSE FEED
HF COMM2
FEED
DC BUS 2 CONTROL
TIE &
UTIL
TRU 2
SENSE
UTIL
BUS
CONT
PWR
SENSE
28 VDC BUS 2
CABIN TEMP CONT
MAN AUTO
LO
LIM
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
28 VDC BUS 2
10
7.5
2
7.5
7.5 7.5 7.5
3 3
3 3
3
3 5 7.5
10 10 50 50 50 3 3
3
3
3 3 3 3 3
3 3
5 5
5 5
3
20 3
3
3
3 3
3
3 3
3
5 7.5 3 3 3
3
7.5
3
3
3 3 3 3 3
3
5 5 5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
7.5 7.5 2 3 3 3
25 25 20 20 10 3 5 3
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
10 5 25 3 3
3
P604_07_014
ELECTRICAL
For Training Purposes Only
May 03
7-35
P I LOT T R A I N I N G GU I D E
Circuit Breaker Panels 3 & 4
Figure 7-27
ESS
TRU
1
STAB CH 2
HSTA
ESS HYD
PUMP
SUPPLY
VOLTS
& FREQ
IND
AC
ESS
FEED
L
DET
L
PITOT
PITOT
STBY
L
AOA
L
STATIC
R
DET
L
HTR
WIND
CTR
PNLS
CB
PNLS
PLT
PNLS
O/H
PNLS
IRU
1 TCAS
ICE
DET
1
ENG
IGN
A
IRU
FAN
1
FDR
PWR
SURF
POS
IND L
26 VAC
ESS
XFMR
A
B
C
D
115VAC ESS BUS
115VAC ESS BUS
115VAC ESS BUS
26VAC ESS BUS 115VAC ESS BUS
115VAC ADG BUS
B/LEAK HEATERS INTEG LTS
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
10
3 3 3
3 3 5 5 5
2 2
3
3 10 5 5 3 5 3 5
7.5 25 25 1
ESS TRU'S
SENSE PWR
SENSE
AUTO STOW
THRUST REV
1 2 1 2 1 2 SOV
SOV
CONT
FSCU
CH 2
ADS
HTR L
CONT
T/T XFER LIGHTS
EMERG FLOOD
DC ESS BUS
A
B
C
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
DC ESS BUS
DC ESS BUS
WARN CONT
CPAM/
EMER
DEPRESS
R OIL
PRESS
TRANS
FMS
DATA
LOAD
STAB
CH 2
HSTCU
L AIR
COND
CONT
A/ICE
MAN
1
10 ST
B/AIR
ISOL
B/LEAK
TEST
HTR
CONT
L WIND
DOOR
EFIS 1
PFD MFD
CONT
PNL
EFIS
CRT
DIMMING
STALL
PROT
R CH
ADC
1
CLOCK
2
CONT
LO LIMIT
CONT
MAN
B/AIR
SOV L
VHF
COMM
3
CKPT TEMP EICAS
DCU 1
CH A
DCU 1
CH B
3 3 7.5 3 3 3 3
3 3
3 3 3
3 3 3 5 3
3 3
3
10 3 3 3
3 10 3
25
10 5
5 5 7.5 7.5 5 1
CIRCUIT BREAKER PANEL CBP-3
CIRCUIT BREAKER PANEL CBP-4
CBP-3
D
1 2 3 4 5 6 7 8 9 10 11 12 13
DC ESS BUS
R IAPS
AFCS 1
XPDR
1
AUDIO
PLT
C/PLT
FMS
CDU
3
ADF
1
VHF
NAV
CVR 1
R IAPS
FAN
5 3 7.5 3 5 3 3 5
P604_07_015
CBP-4
ELECTRICAL
7-36 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Circuit Breaker Panel 5
Figure 7-28
5 3 3 50
50
5
A
B
28VDC APU BATT DIRECT BUS
28VDC MAIN BATT DIRECT BUS
CBP-5
ESS/
EMERG
BUS
FEED
OIL
BYPASS
IND
APU
BATT
CONT
ENG
OIL
POWER
FSCU
L/R
AUX
SOVS
FUEL
DEFUEL T/T
SOVS
PANEL
AUTO
MAN
ADG
BATT
BUS
EXT AC
PWR
CONT
ENG
IGN
B
MAIN
BATT
CONT
APR
DCU
2/3
WATER
SYST.
EXT
SERV
BOARD
SERV
AC
ESS
PWR
CONT
MAIN
BATT
CHGR
OP
APU
BATT
CHGR
OP
LTS
1
2
3
4
5
6
7
8
9
10
11
12
13
1
2
3
4
5
6
7
8
9
10
11
12
13
5
5 5 5
5
3 3 3
3
3 3 7. 5
20
50 10
P604_07_016
ELECTRICAL
For Training Purposes Only
May 03
7-37
P I LOT T R A I N I N G GU I D E
EICAS Synoptic Pages
AC Synoptic Page
AC Synoptic Page Color Coding - Integrated Drive Generators (1 of 2)
Figure 7-29
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
ESS BUS
4
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
P604_07_042
Description Symbol Condition
Engine Outline
Generator 1, 2 Outline
Generator 1, 2 Output
Flow Lines (Lower)
Engine off
Engine running and ready to load
Invalid data
Generator on-line
Generator off with engine running
Both respective generator and engine are off
Invalid data
Generator is on
Generator is off
GEN
1
GEN
2
GEN
1
GEN
2
GEN
1
GEN
2
GEN
1
GEN
2
Generator 2 Output
Flow Line (Lower)
Generator 2 Output
Flow Line (Upper)
Generator 2
Frequency Readout
Generator 1
Frequency Readout
Generator 2
Voltage Readout
Generator 1
Voltage Readout
Generator 2
Load Readout
Generator 1
Load Readout
Generator 1 Output
Flow Line (Lower)
Generator 1 Output
Flow Line (Upper)
ELECTRICAL
7-38 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
AC Synoptic Page Color Coding - Integrated Drive Generators (2 of 2)
Figure 7-30
P604_07_043
Description Symbol Condition
Generator 1, 2
Load Readout
Generator 1, 2
Voltage Readout
Generator 1, 2
Frequency Readout
Generator 1, 2 Output
Flow Lines (Upper)
Generator is loaded
Generator is overloaded
Generator is not on-line
Invalid data
Voltage between 100 and 125 VAC
Voltage less than 100 VAC or more than 125 VAC
Invalid data
Frequency between 375 and 425 Hz
Frequency less than 375 Hz or more than 425 Hz
Invalid data
Generator line contactor at generator position
Generator line contactor at tie position
4
36
0
- -
115
94
- - -
400
429
- - -
KVA
KVA
KVA
KVA
V
V
V
HZ
HZ
HZ
ELECTRICAL
For Training Purposes Only
May 03
7-39
P I LOT T R A I N I N G GU I D E
AC Synoptic Page Color Coding - APU Generator (1 of 2)
Figure 7-31
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
0
0
0
GEN
ESS BUS
KVA
V
HZ
0
0
0
KVA
V
HZ
6
113
400
KVA
V
HZ
P604_07_044
Description Symbol Condition
APU Outline
APU off
APU running and ready to load
Invalid data
APU Generator Outline
APU Generator Output
Flow Line (Lower)
Generator on-line
Generator off with APU running
Both respective generator and APU are off
Invalid data
Generator is on
Generator is off
GEN
GEN
GEN
GEN
APU Generator Output
Flow Line (Lower)
APU Generator Output
Flow Lines (Upper)
APU Generator
Frequency Readout
APU Generator
Voltage Readout
APU Generator
Load Readout
APU
APU
APU
ELECTRICAL
7-40 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
AC Synoptic Page Color Coding - APU Generator (2 of 2)
Figure 7-32
P604_07_045
Description Symbol Condition
APU Generator
Load Readout
APU Generator
Voltage Readout
APU Generator
Frequency Readout
APU Generator Output
Flow Lines (Upper)
Generator is loaded
Generator is overloaded
Generator is not on-line
Invalid data
Voltage between 100 and 125 VAC
Voltage less than 100 VAC or more than 125 VAC
Invalid data
Frequency between 375 and 425 Hz
Frequency less than 375 Hz or more than 425 Hz
Invalid data
Generator line contactor at generator position
Generator line contactor at tie position
6
36
0
- -
113
94
- - -
400
429
- - -
KVA
KVA
KVA
KVA
V
V
V
HZ
HZ
HZ
ELECTRICAL
For Training Purposes Only
Jan 04
7-41
P I LOT T R A I N I N G GU I D E
AC Synoptic Page Color Coding - AC Electrical Power Distribution
Figure 7-33
P604_07_047
Description Symbol Condition
Bus powered
AC BUS 1, 2
Bus Bar Outline
Bus not powered
Invalid data
ESS BUS
Bus Bar Outline
Bus powered
UTIL BUS 1, 2
Bus Bar Outline
AUTO XFER OFF Icon
AUTO XFER FAIL Icon
SHED Icon
Invalid data
Bus inoperative
Bus powered
Bus not powered (shed)
Invalid data
Displayed when AUTO XFER switch/light is manually selected
Indicates that the corresponding automatic bus transfer
has failed
Displayed when AC UTIL BUS 1 and 2 are load shed
BUS 1
BUS 1
BUS 1
BUS 2
BUS 2
BUS 2
ESS BUS
ESS BUS
ESS BUS
UTIL BUS 1
UTIL BUS 1
UTIL BUS 1
UTIL BUS 2
UTIL BUS 2
UTIL BUS 2
AUTO
XFER
OFF
AUTO
XFER
FAIL
SHED
AC ELECTRICAL
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 1 UTIL BUS 2
GEN
4
115
400
KVA
V
HZ
4
115
400
KVA
V
HZ
0
0
0
KVA
V
HZ
AUTO
XFER
OFF
ESS BUS
BUS 2
GEN
2
UTIL BUS 2
4
115
400
KVA
V
HZ
AUTO
XFER
OFF
BUS 2
GEN
2
UTIL BUS 2
0
0
0
KVA
V
HZ
AUTO
XFER
FAIL
SHED
ELECTRICAL
7-42 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
AC Synoptic Page Color Coding - External AC Electrical Power
Figure 7-34
P604_07_046
Description Symbol Condition
External AC Outline
Displayed when external AC power is connected (voltage
greater than 10 VAC and frequency greater than 50 Hz)
External AC Input
Outline
External AC
Voltage Readout
External AC
Frequency Readout
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
0
0
0
GEN
ESS BUS
KVA
V
HZ
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
EXT
AC
EXT
AC
116
400
V
HZ
External AC Input
Outline
External AC power is available (displayed only when
external AC is between 106 to 124 VAC)
External AC power is in use
EXT
AC
EXT
AC
External AC
Voltage Readout
External AC
Frequency Readout
Voltage between 106 and 124 VAC
Voltage less than 106 VAC or more than 124 VAC
Frequency between 370 and 430 Hz
Frequency less than 370 Hz or more than 430 Hz
Invalid data
116
102
400
365
- - -
V
V
HZ
HZ
HZ
ELECTRICAL
For Training Purposes Only
May 03
7-43
P I LOT T R A I N I N G GU I D E
AC Synoptic Page Color Coding - Air-Driven Generator
Figure 7-35
AC ELECTRICAL
UTIL BUS 1
BUS 2
GEN
2
GEN
1
APU
BUS 1
UTIL BUS 2
GEN
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
0
0
0
KVA
V
HZ
ADG
ESS BUS
115
400
V
HZ
P604_07_048
Description Symbol Condition
ADG Outline
Displayed when external AC power is connected (voltage
greater than 10 VAC and frequency greater than 50 Hz)
ADG Voltage ADG Input Outline
Readout
ADG Frequency
Readout
ADG Input Outline
ADG power is available (displayed only when
external AC is between 106 to 124 VAC)
ADG ADG power is in use
ADG Voltage
Readout
ADG Frequency
Readout
Voltage between 106 and 124 VAC
Voltage less than 106 VAC or more than 124 VAC
Frequency between 370 and 430 Hz
Frequency less than 370 Hz or more than 430 Hz
Invalid data
115
100
400
435
- - -
V
V
HZ
HZ
HZ
ADG
ADG
ELECTRICAL
7-44 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
DC Synoptic Page
DC Synoptic Page - TRU Power Distribution System (1 of 2)
Figure 7-36
DC ELECTRICAL
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
28 V
8 A
TRU 2
28 V
13 A
ESS
TRU 2
28 V
24 A
ESS
TRU 1
28 V
24 A
MAIN
BATT
26 V
0 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
P604_07_049
Description Symbol Condition
AC BUS to TRU
Flow Lines
TRU 1 and TRU 2
Outline
Respective AC BUS is powering TRU
No AC power to TRU
TRU voltage is 18 VDC or greater
TRU voltage is less than 18 VDC
Invalid data
AC BUS to TRU
Flow Lines
TRU Voltage
Readouts
TRU Load
Readouts
TRU 1 TRU 2
TRU 1 TRU 2
TRU 1 TRU 2
Essential TRU 1 and
TRU 2 Outline
TRU voltage is 18 VDC or greater and load is greater
than 3 amps
TRU voltage is less than 18 VDC or load is less than 3 amps
Invalid data
ESS
TRU 1
ESS
TRU 2
ESS
TRU 1
ESS
TRU 2
ESS
TRU 1
ESS
TRU 2
V
V
V
V
V
V
A
A
A
A
A
A
V
V
V
V
V
V
A
A
A
A
A
A
28
0
- -
28
0
- -
28
0
- -
28
0
- -
8
0
- -
24
0
- -
13
0
- -
24
0
- -
ELECTRICAL
For Training Purposes Only
May 03
7-45
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - TRU Power Distribution System (2 of 2)
Figure 7-37
P604_07_050
Description Symbol Condition
TRU Voltage
Readouts
TRU Load
Readouts
Voltage is between 22 and 29 VDC
Voltage is less than 22 VDC or more than 29 VDC
Invalid data
Load is between 3 and 99 amps
Load is less than 3 amps or more than 99 amps
Invalid data
28
18
- -
8
0
- -
V
V
V
A
A
A
ELECTRICAL
7-46 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - Battery Power Distribution System (1 of 2)
Figure 7-38
DC ELECTRICAL
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
28 V
8 A
TRU 2
28 V
13 A
ESS
TRU 2
28 V
24 A
ESS
TRU 1
28 V
24 A
MAIN
BATT
26 V
4 A
APU
BATT
27 V
4 A
EXT
DC
28 V
19 A
P604_07_051
Description Symbol Condition
Main Battery
Voltage Readout
APU Battery
Voltage Readout
EXT DC IN USE
Main Battery
Load Readout
APU Battery
Load Readout
MAIN Battery Outline
Battery voltage is equal to or greater than 18 VDC
Battery voltage is less than 18 VDC
Invalid data
BATT OFF Main battery is less than 18 VDC
BATT OFF
CHGR FAIL
CHGR FAIL Main battery is not charging or Main charger has failed
APU battery is less than 18 VDC
APU battery is not charging or APU charger has failed
MAIN
BATT
MAIN
BATT
MAIN
BATT
V
V
V
A
A
A
MAIN
BATT
26 V
0 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
APU BATT
DIR BUS
MAIN
BATT
MAIN
BATT
15 V 24 V
7 A 0 A
APU
BATT
APU
BATT
BATT OFF BATT OFF CHGR FAIL CHGR FAIL
17 V 24 V
9 A 0 A
26
15
- -
0
7
- -
APU Battery Outline
Battery voltage is equal to or greater than 18 VDC and EXT
DC is not in use
Battery voltage is less than 18 VDC and EXT DC is not in use
EXT DC is in use
Note: APU BATT voltage and amperage go blank
Invalid data
APU
BATT
APU
BATT
APU
BATT
APU
BATT
V
V
V
A
A
A
27
17
- -
0
9
- -
ELECTRICAL
For Training Purposes Only
May 03
7-47
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - Battery Power Distribution System (2 of 2)
Figure 7-39
P604_07_052
Description Symbol Condition
MAIN and APU Battery
Voltage Readouts
MAIN and APU Battery
Load Readouts
Voltage is between 18 and 32 VDC
Voltage is less than 18 VDC or greater than 32 VDC
Invalid data
Battery is equal or greater than 12 VDC or load is greater
than 0 amps
Battery is less than 12 VDC and load is 0 amps
Invalid data
26
10
- -
8
0
- -
V
V
V
A
A
A
EXT DC Outline
EXT DC voltage is less than 18 VDC
EXT DC voltage is equal or greater than 18 VDC
EXT
DC
V
A
EXT
DC
V
A
28
16
19
5
ELECTRICAL
7-48 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - DC Electrical Power Distribution (1 of 2)
Figure 7-40
DC ELECTRICAL
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
28 V
8 A
TRU 2
28 V
13 A
ESS
TRU 2
28 V
24 A
ESS
TRU 1
28 V
24 A
MAIN
BATT
26 V
0 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
P604_07_053
Description Symbol Condition
Bus Input
Flow Lines
DC BUS 1, 2
Bus Bar Outline
Bus powered
Bus not powered
Invalid data
UTIL BUS 1, 2
Bus Bar Outline
BUS 1
BUS 1
BUS 1
BUS 2
BUS 2
BUS 2
Bus powered
Bus not powered
Invalid data
UTIL BUS 1
UTIL BUS 1
UTIL BUS 1
UTIL BUS 2
UTIL BUS 2
UTIL BUS 2
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
TIE
MAIN BUS TIE CLOSED
Bus Input
Flow Lines
Respective TRU/battery is on-line and output is 18 VDC
or greater
Respective TRU/battery is on-line and output is less than
18 VDC or no supply is being provided to respective bus
ELECTRICAL
For Training Purposes Only
May 03
7-49
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - DC Electrical Power Distribution (2 of 2)
Figure 7-41
Description Symbol Condition
P604_07_054
APU BATT
DIR BUS
Bus Bar Outline
Battery voltage is greater than 18 VDC, BATT MASTER
switch ON, and EXT DC not in use
Battery voltage is less than 18 VDC, BATT MASTER
switch ON, and EXT DC not in use
APU BATT
DIR BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
Bus Bar Outline
Invalid data
Battery voltage is greater than 18 VDC and BATT MASTER
switch ON
Battery voltage is less than 18 VDC and BATT MASTER
switch ON
Invalid data
MAIN BATT
DIR BUS
MAIN BATT
DIR BUS
MAIN BATT
DIR BUS
APU BATT
DIR BUS
ESS BUS and
BATT BUS
Bus Bar Outline
Bus powered
Bus not powered
Invalid data
ESS BUS
ESS BUS
ESS BUS
BATT BUS
BATT BUS
BATT BUS
ELECTRICAL
7-50 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
EICAS Messages
MESSAGE MEANING AURAL WARNING
(IF ANY)
EMER POWER ONLY ADG is supplying the AC essential bus, and no power is
available from AC BUS 1 or 2. TRIPLE ATTENSON
AC 1 AUTOXFER Respective automatic AC bus tie function has been inhibited because of an overcurrent
AC 2 AUTOXFER condition on the respective AC bus.
AC BUS 1
Respective AC bus is unpowered.
AC BUS 2
AC ESS BUS AC essential bus is unpowered.
APU BATTERY OFF APU battery is less than 18 VDC.
APU GEN OFF APU generator is off-line with the APU running.
APU GEN OVLD Load on the APU generator exceeds 34.5 kVA.
BATTERY BUS Battery bus is unpowered.
DC BUS 1
Respective DC bus is unpowered.
DC BUS 2
DC EMER BUS DC emergency bus is unpowered.
DC ESS BUS DC essential bus is unpowered.
GEN 1 OFF
Respective generator is OFF.
GEN 2 OFF
GEN 1 OVLD
Load on respective generator exceeds 34.5 kVA.
GEN 2 OVLD
MAIN BATTERY OFF Main battery is less than 18 VDC.
AC ESS ALTN AC essential bus is powered by AC BUS 2.
AC UTIL 1 OFF
Respective AC utility bus is unpowered.
AC UTIL 2 OFF
APU BATT CHGR FAIL APU battery is not charging or APU charger has failed.
ESS TRU 1 FAIL
Respective essential transformer-rectifier unit output is less than 18 VDC.
ESS TRU 2 FAIL
MAIN BATT CHGR FAIL Main battery is not charging or main battery charger has failed.
EICAS Messages
Table 7-1