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Taxi Lights
Ground Proximity Warning
System (GPWS)
Enhanced Ground Proximity
Warning System (EGPWS)
<0040>
Flight Recorder Power
Hydraulic System Fan
Display Cooling Fan (R)
Exhaust and Cockpit Fan
Flap Power Drive Unit (1)
Engine Vibration Monitor
ADG Deploy Sensor
TRU 1, DC essential bus
HSTA (Ch--1)
Hydraulic Pumps 3A and 1B
Right Windshield Heaters
Right Window Heater
Ice Detector 2
Instrument Lights (copilot and
overhead), Landing and Taxi
Lights (R)
Inertial Reference System (2)
<0025>
ARINC Display Fan, Galley
and Cabin Fan
Flap Power Drive Unit (2)
ADG Deploy Sensor
TRU 2, DC Essential bus
HSTA (Ch--2)
Bleed Leak Controllers (L / R)
Left Window Heater
Probe Heaters (L) (AOA and
Pitot)
Ice Detector 1
Engine Ignition A
Instrument Lights (Pilot’s and
Center)
CB Panel Integral Lights
Inertial Reference System (1)
<0025>
Head--up Guidance System
<0026>
Traffic Alert and Collision
Avoidance (TCAS)
ARINC Chassis and Display
Cooling Fans (L)
Essential TRU 1
AC UTILITY BUS
1
AC UTILITY BUS
2
AC SERVICE
BUS
ADG Bus
Galley (1) and
ffMkr
Galley (2) and
Wr m
Service TRU
Vacuum Cleaner
Hydraulic Pump 3B
Co ee a e ps
Main Battery
Charer
ate Syste
APU Battery
Charer
Toilet
Motor/pump
Flag
Power Sensing
Relay
g
Power Sensing
Relay
REV 56, Jan 31/03
Vol. 1 07--20--12
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
E. Air Driven Generator (ADG)
In the event of a complete AC power failure in flight, the ADG will automatically deploy
and supply 115--volts, 400 Hz AC emergency power to the ADG bus. The ADG
generator is rated at 15 KVA. The ADG bus will then supply emergency power to the
AC essential bus and the 3B hydraulic pump. The AC essential bus will then power
essential TRU 1, which will power the DC essential bus.
If the automatic deploy function fails, the ADG can be deployed manually by pulling the
ADG manual release handle on the ADG CONTROL control panel at the rear of the
center console.
If either main generator is restored, the crew can override the ADG by pressing the
PWR TXFR OVERRIDE button on the ADG control panel. This will reconnect the
restored IDG to power AC bus 1, AC bus 2 and the AC essential bus. The ADG will
continue to power the critical flight controls and the ADG bus. The flaps will move at
half speed when powered from the ADG bus.
The ADG generator, voltage, frequency and ADG bus indications on the EICAS, AC
ELECTRICAL synoptic page are only displayed when the ADG bus is powered.
The ADG will continue to operate and supply power to the ADG bus until the airspeed
decreases below approximately100 kts. At that point, if the APU generator or IDG has
not been restored, the only power available will be from the batteries.
The ADG cannot be restowed in flight. It is restowed manually, on the ground, by
maintenance personnel.
NOTE
After ADG deployment or APU generator switching,
intermittent failure of the pilot’s and copilot’s air data
systems may occur. These failures may result in
uncommanded changes to the pilot’s or copilot’s flight
instruments. The barometric altimeter setting, altitude
preselector, V--speeds and speed bug settings should
be checked and reset as required.
Automatic deployment of the ADG is inhibited, on the ground, when the parking brake
is set.
The ADG system circuits can be checked through a LAMP/UNIT test switch on the ADG
control panel. When the switch is set to LAMP, a ground is supplied to check that the
green TEST light illuminates. The UNIT test has two modes, Pre--takeoff and Inflight:
S Pre--takeoff,
When the test switch is set to UNIT the ADG system circuits are checked and the
TEST light will illuminate within 1 second and remain ON for 2 seconds.
S Inflight,
When the test switch is set to UNIT the ADG system circuits are checked and the
TEST light will illuminate after 5 seconds and remain ON for 2 seconds.
Vol. 1 07--20--13
REV 56, Jan 31/03
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
Air Driven Generator (ADG)
Figure 07---20---7
ADG Manual Deploy Handle
and Auto--Deploy Panel
Center Pedestal
TEST Light (green)
Comes on after successful
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