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rectifier units (TRU) and forward AC loads. Aft AC loads are fed directly from the ACPC. Each
generator normally powers its own bus, through a generator line contactor (GLC). Generator #4 also
powers AC ESS BUS. In the event of a generator malfunction, the generator transfer contactors
(GTC) will automatically switch to an alternate generator, to supply the affected bus. AC bus 2 and 3
are automatically shed during single generator operations.
AC power can also be supplied by the auxiliary power unit (APU) generator. The APU constant
frequency generator is rated at 115 volt, 40 KVA, 3 phase, 400 Hz output. The APU generator has a
ground power rating of 45 KVA continuous.
External AC power, 115 volt, 3 phase, can also be used to supply power to the AC system.
External AC Power
Receptacle
EXT AC
GROUND
SERVICE EXT DC
BATTERY
MASTER
LAMP
TEST HDPH MIC
APU
SHUT−OFF
AVAIL AVAIL
IN USE IN USE
ON ON
External AC/DC Power Status
Indicators
Displays status of external AC or
DC power.
Battery Master Status Indicator
Displays status of the battery master
switch (EMS or ON position).
Ground Service Mode Switch
Enables maintenance personnel to power selected AC
loads in the cabin, with AC external power connected.
External Service Panel
SERVICE
LIGHTS
OFF
GF0710_003
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−4
AC SYSTEM (CONT'D)
Emergency AC power is supplied by the ram air turbine (RAT) in flight, rated at 115/200 volts, 9 KVA,
3 phase, 340−440 Hz. The RAT will automatically deploy when a loss of all AC power is sensed, or
when both engine are not operating in weightoffwheel
configuration. The RAT can also be
manually deployed by pulling RAT manual deploy handle, located on the centre pedestal.
MANUAL DEPLOY
HANDLE RAT
GF0710_004
The RAT also incorporates a hydraulic pump, which powers hydraulic system #3. At approximately
145 KIAS and below, the RAT sheds its electrical output, giving priority to hydraulics.
A ground safety pin is installed in the nose wheel well area to secure the RAT in position while on
ground.
GROUND
SAFETY
PIN
GF0710_005
DEPLOYMENT
ACTUATOR
RETRACTION
PUMP
UPLOCK
RAM AIR
TURBINE
GENERATOR
HYDRAULIC
PUMP
DOWNLOCK
RELEASE
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
07−10−5
AC SYSTEM DISTRIBUTION
9
GTC
7
GEN
2
GEN
1
AC BUS 1
LH Engine RH Engine
AC BUS 3 AC BUS 4
AC ESS BUS
APU
GEN
EXT
AC
ACPC
AC BUS 2
GCU
GCU
GCU GCU
GCU
GTC
12
GTC
11
GTC
4
GTC
5
GLC
1
GLC
2
GLC
3
GLC
4
GTC
3
GTC
6
GTC
GTC 1
8
GTC
GTC
2
GTC
10
RATLC
EPLC APULC
CCBP
TRU 1
RAT GEN
GCU
AC BUS 1A AC BUS 2A AC BUS 3A
TRU 2
ESS
TRU 1
ESS
TRU 2
GEN
3
GEN
4
GF0710_006
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−6
ELECTRICAL PANEL
The generators and external power can be controlled manually by selecting the appropriate switch on
the electrical panel, located on the overhead panel. GEN 1, 2, 3 , 4 and APU GEN switches are
normally ON.
RAT GEN Switch
Used to reset a fault or to turn
RAT generator off.
generator is on line.
RAT generator operation is
inhibited.
GEN 1, 2, 3, 4 Switches
Used to reset or to turn
applicable generator off.
failed generating channel
(GEN, GCU, GLC). FAIL light
illuminates when fire
discharge handle is pulled
generator operation inhibited.
APU GEN Switch
Used to reset or to turn
APU generator off.
failed generating channel.
generator operation inhibited.
NOTE
If RAT GEN is powering AC ESS BUS, and a main generator is available, stow the RAT deploy
handle and select RAT GEN to OFF, to transfer AC ESS BUS to the main generator. The RAT
GEN will remain armed to ensure RAT GEN priority in the event of loss all main generators.
External AC Switch
Displays status of AC external power:
external AC power is connected and is the
correct phase, voltage and frequency.
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