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performs a test of the windshield and window heat systems. A successful test is
indicated by the L (R) WSHLD HEAT OK and L (R) WINDOW HEAT OK advisory
EICAS messages appearing.
With the WSHLD/WIND switches in the LOW position, only the side window heat
system will be tested.
ICE AND RAIN PROTECTION
For Training Purposes Only
Sept 04
14-9
P I LOT T R A I N I N G GU I D E
Air Data Probes and Sensors Anti-Icing
Description
The air data probes and sensors are located on either side of the aircraft nose and are
electrically heated to prevent ice formation. Two air data sensor heat controllers
(ADSHCs) provide control and monitoring of the probe heaters.
Two probe toggle switches located on the ANTI-ICE panel provide control of AC
power to left side and right side heating elements. Activation of the heating elements is
determined by probe switch positions, engine generator operation, and passenger door
status.
Air Data Probes and Sensors Anti-Icing System
Figure 14-5
Left Static
Port
OFF
ON
OFF
ON
LOW LOW
OFF/
RESET
HI HI
L R L R
WSHLD/WIND PROBES
TEST OFF/
RESET
Left
Pitot-Static
Probe
Right
Pitot-Static
Probe
Standby
Pitot Probe
Total Air
Temp Probe
Left
Angle-of-Attack
Vane
Right
Angle-of-Attack
Vane
Right Static
Port
Auxiliary
Angle-of-Attack
Vane
RIGHT
CONTROLLER
(ADSHC)
P604_14_006
LEFT
CONTROLLER
(ADSHC)
ICE AND RAIN PROTECTION
14-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
Primary Pitot-Static Probes
There are two pitot-static masts, one on either side of the nose. The pitot static mast
consists of a head and mounting base. The mast has two heaters, one in the head and
the other in the base.
Standby Pitot Probe
There is one standby pitot probe on the left side of the nose which contains one
integral heating element.
Alternate Static Ports
Two flush alternate static ports are located on each side of the aircraft and each
contains an integral heating element.
Angle-Of-Attack (AOA) Vanes
Two angle-of-attack vanes are located on each side of the aircraft and each contains an
integral heating element in the vane.
Auxiliary Angle-Of-Attack Vane
One auxiliary angle-of-attack vane is located on the right side of the nose and contains
two integral heating elements, one for the vane and the other for the base.
Total Temperature (TAT) Probe
One total air temperature sensor is located on the right side of the aircraft and contains
an integral heating element.
Air Data Sensor Heat Controllers (ADSHCs)
The ADSHCs provide control of AC power to respective heating elements and detect
system failures. Should any ADSHC lose control power, all probes connected to the
failed ADHSC 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.
ICE AND RAIN PROTECTION
For Training Purposes Only
May 03
14-11
P I LOT T R A I N I N G GU I D E
Probe Switches
The L and R PROBES switches are used to control AC power to the probe heaters via
the ADHSCs. The L PROBES switch controls the left pitot-static probe, the standby
pitot-probe, the left angle-of-attack vane and the left static port. 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 AND RAIN PROTECTION
14-12 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
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 Detectors
Figure 14-6
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
　
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