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If the wing anti-ice has failed, a message is displayed on the EICAS. If ice is detected
during this failure condition, the stall warning trigger points are advanced
automatically. Ensure rpm (N2) is above 76% prior to going to the QRH. Increasing
rpm above 76% may fix this amber message.
NOTE
If ice is detected, the stall warning trigger points are advanced
automatically. For more information on stall protection refer to
Chapter 11, FLIGHT CONTROLS.
WING A/ICE OVHT
GX_03_016
BLEED / ANTI-ICE
LP
AIR
COND
HP
L
LP
HP 40
PSI
40
PSI
R
APU
L-R WING A/ICE FAIL
ICE
STALL WARN ADVANCE
GX_03_017
For Training Purposes Only
Sept 04
3-15
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
PNEUMATIC ANTI-ICING
Engine bleed air is used for the pneumatic anti-icing systems.
COWL ANTI-ICING (CAI)
The cowl anti-icing system is used to prevent formation of ice on the nose cowl of the
engine. The cowl leading edge uses hot engine bleed air from the low pressure port
(5th stage) to heat the nose cowl. The bleed air is ducted through a spray ring and
exhausts to the atmosphere through an exit grill.
ENGINE SPINNER
The engine spinner point is made of soft rubber which will distort during engine
operation thus shedding any ice accumulation. The rear of the spinner and the fan
blades use centrifugal force to prevent ice accumulation during engine operation.
Spinner
Fan Blades
AIR INLET COWL AND SPINNER
Spinner Point
Nose Cowl Lip
Spray Ring
Exhaust
Duct
Exhaust
Bleed Air
Supply Duct
Nose
Cowl
Lip
GX_03_018
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
3-16 For Training Purposes Only
Sept 04
COWL ANTI-ICE VALVES
There are two Cowl Anti-Ice Valves (CAIV) which control the flow of engine bleed
air to the cowl ducting. The CAIVs are spring-loaded open, pneumatically operated,
electrically controlled, pressure regulating and shutoff valves that are controlled by
signals from the ice detection system. They are either fully open or fully closed.
CAI OPERATION
When the L and/or R COWL selector is selected to AUTO and ice is detected, the ice
detection system sends a signal to a relay in the ANTI-ICE panel that commands the
anti-ice valves open. If an ice detector fails during icing conditions, the other detector
will activate both cowl anti-ice valves in AUTO mode. A status message is displayed
on the EICAS.
L-R COWL A/ICE AUTO
GX_03_019
RH ICE DETECTOR
LH ICE DETECTOR
CAI
Low
Press
Port
High
Press
Port
Spray
Ring
LP
HP
LP
HP
R COWL
AUTO
OFF ON
L COWL
AUTO
OFF ON
For Training Purposes Only
Sept 04
3-17
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
Cowl anti-icing can be manually selected to ON. This will open the CAI valves
independent of the ice detection system and display a status message. Whenever cowl
anti-ice is activated (AUTO or ON), a CAI icon will be displayed on the EICAS page.
73.3
T/O
SYNC
N1
73.3
789
ITT
789
CAI CAI
L-R COWL A/ICE ON
L COWL
AUTO
OFF ON
GX_03_020
LP
HP
CAI Indication
EICAS
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
3-18 For Training Purposes Only
Sept 04
ELECTRICAL ANTI-ICING
Electrical power is used to operate the following:
AIR DATA PROBES AND SENSORS
The air data probes and sensors anti-ice system prevents ice accumulation on the
probes and sensors which could lead to incorrect data transmission to the Air Data
Computers (ADC).
The air data probes and sensors anti-ice system is controlled automatically by two
Heater/Brake Temperature Monitoring Units (HBMU).
HBMU
HBMU1 controls AOA 1, PS 1, PS 3 and TAT 1 and YD Heater 1 and monitors BTMS
1 and BTMS 2.
HBMU 2 controls AOA 2, PS 2, PS Standby, TAT 2, TAT 3 and YD Heater 2 and
monitors BTMS 3 and BTMS 4.
GX_03_021
BTMS 3
BTMS 1
BTMS 4
BTMS 2
YDA HEATER 1
YDA HEATER 2
PS1
PS3
PS STANDBY
PS2
AOA 2
AOA 1
TAT 3
HBMU 1
HBMU 2
TAT 1
TAT 2
YDA
TAT
BTMS
AOA
PS
– Yaw Damper Actuator
– Total Air Temperature
– Brake Temperature Monitor System
– Angle of Attact
– Pitot/Static
　
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