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With the WSHLD/WIND switches in the LOW position, only the side window heat system will be tested.
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 the 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.
ICE AND RAIN PROTECTION Description Vol. 2 14.10.9
Oct 05/06
Air Data Probes and Sensors Anti-Icing System
Figure 14.10.5
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.
ICE AND RAIN PROTECTION Description Vol. 2 14.10.10
Oct 05/06
AIR DATA PROBES AND SENSORS ANTI-ICING (CONT'D) 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 Air Temperature (TAT) Probe
One total air temperature sensor is located on the right 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 also detect system failures. Should any ADSHC lose control power, all probes connected to the failed 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 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:
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