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ADSHC will receive full AC power (fail-safe ON). Should a fault condition be detected by any
ADSHC, the applicable EICAS caution message(s) will be displayed.
Probe Switches
The L and R PROBES switches are used to control AC power to the probe heaters via the
ADSHCs.. The L PROBES switch controls the left pitot-static probe, the standby pitot probe, the
left angle-of-attack vane and the left static probe. The R PROBES switch controls the right
pitot-static probe, the total air temperature probe, the right angle-of-attack vane, the right static
port and the auxiliary angle-of-attack probe.
Electrical power is applied to the respective heaters under the following conditions:
• L (R) PROBES switch ON, and
• Any one engine generator on-line or PAX door is locked.
With the L and R PROBES switches selected ON, all probes are heated and no EICAS caution
messages are displayed.
ICE DETECTION SYSTEM
Description
The ice detection system alerts the flight crew of icing conditions. The system consists of two
independent ice detector/microprocessors, one installed on each side of the forward fuselage.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ICE DETECTION SYSTEM (CONT'D)
Ice Detectors
Figure 14−10−6
Components and Operation
Each ice detector consists of a probe and a microprocessor, which operate continuously (no
switch control). The probe extends into the airstream to detect icing conditions. The
microprocessor is a self-contained unit, and interfaces with the data concentrator units (DCUs) to
provide the flight crew with a visual indication of icing conditions.
The ice detector probes vibrate at high frequency. When icing conditions are encountered, ice
accumulation on the probe causes a frequency change in the probe. The microprocessor detects
the frequency change, triggers an ICE advisory or ICE caution EICAS message, and begins the
probe’s deicing cycle. During probe deicing, the probe is electrically heated for 5 seconds, followed
by 55 seconds with no heat. The cycle repeats automatically as long as a frequency change is
detected. When no ice accumulation is detected, the heat cycle ceases and the ICE message on
the EICAS is removed.
Ice Detection Test
Selecting the TEST switch on the ANTI-ICE panel to the DET position checks the circuitry of the
ice detectors.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS
The ANTI-ICE panel provides the system control switches and switch/lights, and the EICAS primary
and secondary displays provide the system warning/caution and advisory messages respectively.
ANTI-ICE Panel
Anti-Ice Panel
Figure 14−10−7
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−12
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
EICAS MESSAGES
EICAS Messages – Wing Anti-Ice System
MESSAGE MEANING
AURAL WARNING
(IF ANY)
ANTI-ICE DUCT Bleed air leak detected in left and/or right fuselage or
wing anti-ice ducts.
“ANTI-ICE DUCT”
WING OVHT Overheat condition detected in left and/or right wing
leading edge.
“WING OVERHEAT”
L WING A/ICE With wing anti-ice selected on, insufficient pressure and temperature in
R WING A/ICE respective wing leading edge for anti-icing.
WING A/ICE SNSR Wing anti-ice sensor failure detected (control and/or overheat sensor).
WING A/ICE ON Wing anti-ice is selected on with sufficient heat and pressure available for
anti-icing.
WING/COWL A/ICE ON Wing and cowl anti-ice selected on and sufficient heat/pressure available for
anti-icing.
WING A/ICE OK Successful test of the wing anti-ice system.
EICAS Messages – Engine Cowl Anti-Ice System
MESSAGE MEANING
L COWL A/ICE
R COWL A/ICE
Cowl anti-ice valve failure:
• With the cowl anti-ice selected on, respective cowl has insufficient
pressure for anti-icing, or
• With the cowl anti-ice selected off, respective cowl senses pressure (i.e.
valve failed open).
COWL A/ICE ON Both cowl anti-ice switches selected on and both cowls have sufficient
pressure for anti-icing.
L COWL A/ICE ON Left cowl anti-ice switch selected on and left cowl has sufficient pressure for
anti-icing.
R COWL A/ICE ON Right cowl anti-ice switch selected on and right cowl has sufficient pressure
for anti-icing.
EICAS Messages – Windshield/Window Anti-Ice System
　
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