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• PS 1 Heater Off − ADG deployed and ADC 1 not selected or AC ESS BUS unpowered
and AC BUS 1 unpowered.
• PS 2 Heater Off − AC BUS 2 unpowered.
• PS 3 Heater Off − ADG deployed and ADC 3 not selected or AC ESS BUS unpowered.
• PS STBY Heater Off − AC ESS BUS unpowered.
• TAT 1 Heater Off − WOW and LH engine Off.
• TAT 2 Heater Off − WOW and RH engine Off.
• TAT 3 Heater Off − WOW or AC BUS 3 unpowered.
• YD 1 Heater On − TAT <−40°C and Yaw Damper 1 not engaged.
• YD 2 Heater On − TAT <−40°C and Yaw Damper 2 not engaged.
The “all heaters off” control function, turns OFF all heaters and overrides the above heater on/off
logic equations when :
• L and R engine not running and/or,
• WOW and/or,
• airspeed less than 50 knots.
ICE AND RAIN PROTECTION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
14−10−14
AIR DATA PROBES AND SENSORS (CONT'D)
Probes
There are four Pitot-Static (PS) probes on the side of the fuselage. They supply pitot and static
pressure to the air data computers and standby instruments. Heater elements are installed in the
PS heads and mounting bases.
There are three Total Air Temperature (TAT) probes, one on the fuselage and one each in the
engine inlets.
There are two AOA probes, mounted on the fuselage, one on either side.
PS STANDBY
PS 1
PS 3
PS
STANDBY
PS 2
TAT 3
TAT 3
PS 2
TAT 2
TOP VIEW
ENGINE INLET
TAT 1/2
AOA 1 AOA 2
AOA 2
PS 3
PS 1
TAT 1
AOA 1
GF1410_023
PROBE
The current being drawn by the heater is measured and a heater fault is generated if the current
drawn is less than the minimum required by the particular probe. The fault is then transmitted to
EICAS.
GF1410_024
L−R AOA HEAT FAIL
PITOT 1−2−3 HT FAIL
STBY PITOT HT FAIL
TAT 1−2 FAIL
ICE AND RAIN PROTECTION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
14−10−15
WINDSHIELD HEAT
The Windshield Temperature Control System provides defog and anti-icing for the Pilot’s and
Copilot’s windshield and side window. The system continuously monitors the temperature of each
windshield and side window and maintains the temperature within specified limits.
Windshield Temperature Controller
There are two dual channel Windshield Temperature Controllers (WTC). The left hand WTC
controls the left windshield heater and the left side window heater. The right hand WTC controls
the right windshield heater and the right side window heater. Both WTCs are interfaced with
EICAS via different DAUs.
GF1410_025
EICAS
LEFT
WINDOW
HEATER
LEFT
WINDSHIELD
HEATER
RIGHT
WINDSHIELD
HEATER RIGHT
WINDOW
HEATER
98F
98F 98F
98F
CONTROLLER CONTROLLER
R
WINDSHIELD HEAT
OFF/ ON
RESET
L
OFF/ ON
RESET
The windshield construction is laminated, stretched acrylic mainplies, which incorporate a gold
conductive film as the de-icing heater element. The windshield also includes three temperature
sensor elements, one for controlling and monitoring and two spares.
The side window construction is similar to the windshield, except that the stretched acrylic
mainplies are thinner. The side window also includes a heating element for defog and three
temperature sensor elements, one for control and monitoring and two spares.
ICE AND RAIN PROTECTION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
14−10−16
WINDSHIELD HEAT (CONT'D)
Windshield Heat Panel
Selections for the Pilot’s and Copilot’s Windshields and Side Windows heating, are made on the
WINDSHIELD HEAT panel, located on the overhead panel.
− Resets the system, in the event of a failure.
− Inhibits all windshield and window fail messages.
Left and Right Windshield Heat selectors
GF1410_026
OFF/RESET
ON
− Turns windshield/window heat OFF.
− Activates the windshield/window temperature control system.
R
WINDSHIELD HEAT
OFF/ ON
RESET
L
OFF/ ON
RESET
MODES OF OPERATION
The windshield modes of operation are as follows:
Warm-Up Mode
The warm-up mode is provided to avoid the effect of thermal shock on the windshield. While in the
warm-up mode, the windshield heater generates only 33% of nominal heat and lasts for
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