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The ice detector incorporates a vibrating probe that maintains a preset frequency
(40 kHz) to detect icing conditions. As the ice detector enters an icing environment,
ice collects on the vibrating probe. The added mass of ice causes the frequency of the
probe to decrease. A 0.010 inch thickness of ice equals a 65 Hz decrease and
immediately the ice detector de-ices the strut and the probe through internal heaters.
Heater power is applied until the frequency rises to a predetermined level, plus a time
delay factor (60+/-5 seconds) to ensure complete de-icing. If an additional icing/deicing
cycle occurs during that time interval, the 60 seconds cowl and wing anti-ice
activation period is begun again.
Vibrating
Probe
Strut
Mounting
Flange
Electrical
Connector
GX_03_005
GX_03_006
Vibrating
Probe
Strut
Heaters
SECTIONAL VIEW
Probe
Heater
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
3-6 For Training Purposes Only
Sept 04
The Ice detectors emit icing signals to the following:
• Anti-Ice panel (cowl anti-ice relay) for activation of the cowl anti-icing system
(AUTO)
• BMC for activation of the wing anti-icing system (AUTO). The AUTO operation
of WING ANTI-ICE is inhibited during takeoff until the airplane is > 400 feet
above field elevation
• Stall protection system, to change stick shaker control. Stick shaker control will
only be adjusted if an ice detector has failed and icing is detected. For more
information on Stall Protection, refer to Chapter 10, FLIGHT CONTROLS
Once de-iced, the probe cools within a few seconds and is ready to sense ice build-up
again. This cycling process is repeated as long as the ice detector remains in an icing
environment.
The ice detection system will detect and indicate icing when the airplane is on the
ground. However due to the sensitivity of the ice detector probes, the ice detection
system should be considered ineffective at airspeeds less than 30 knots IAS.
ICE DETECTION INDICATION
If ice is detected while the ANTI-ICE system is turned OFF, a caution message is
displayed on EICAS.
ICE
GX_03_007
ANTI-ICE
L COWL WING R COWL
AUTO AUTO AUTO
OFF ON OFF ON OFF ON
For Training Purposes Only
Sept 04
3-7
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
If ice is detected while the ANTI-ICE system is turned ON or AUTO, the following
advisory message is displayed on EICAS.
If both ice detectors have failed, a caution message is displayed on the EICAS. The
crew must revert to manual selection of cowl and wing anti-ice.
ANTI-ICE
L COWL WING R COWL
AUTO AUTO AUTO
OFF ON OFF ON OFF ON
ANTI-ICE
L COWL WING R COWL
AUTO AUTO AUTO
OFF ON OFF ON OFF ON
ICE
GX_03_008
OR
ICE DETECTOR FAIL
ANTI-ICE
L COWL WING R COWL
AUTO AUTO AUTO
OFF ON OFF ON OFF ON
GX_03_009
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
3-8 For Training Purposes Only
Sept 04
COMPONENTS
GX_03_010
WAIV
CAIV
CBW
BMC
Ice
Detectors
Anti-Ice
Temperature
Probes
Piccolo
Ducts
For Training Purposes Only
Sept 04
3-9
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
WING ANTI-ICE VALVE (WAIV)
Two wing anti-ice valves are electrically controlled, pneumatically operated, spring
loaded closed, modulating shutoff valves. The ice detector system will send a signal to
the BMC to activate the wing anti-ice system.
One temperature sensor, located in the fixed leading edge, provides a signal to the
control channel of the BMC which drives the WAIVs open or closed. A second
temperature sensor, located in the fixed leading edge, provides a signal to a monitoring
channel in the BMC. One channel controls while the other channel acts as a monitor
which can assume control in the event of a failure of the first sensor. In the event of
complete failure of the sensors on one side the serviceable control sensor on the
opposite side will control the WAIVs.
WAI OPERATION
When selected to AUTO, the ice detectors will send a signal to the BMC to activate
the wing anti-ice system. Wing anti-ice can be manually selected to ON in which case
the WAIVs will open independently of the ice detection system. Whenever wing antiice
is activated (AUTO or ON), a WAI icon will be displayed on the EICAS page. The
ICON color will vary from amber, green, or white, depending on the temperature in
the wing or its status.
WING A/ICE AUTO
　
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