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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 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
14−10−15
WINDSHIELD HEAT
The Windshield Temperature Control System provides defog and antiicing
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 deicing
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 3, Apr 25, 2005
CSP 700−5000−6
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:
WarmUp
Mode
The warmup
mode is provided to avoid the effect of thermal shock on the windshield. While in the
warmup
mode, the windshield heater generates only 33% of nominal heat and lasts for
approximately 4 minutes, then is terminated. The warmup
mode is activated on WTC powerup,
when the following conditions are met:
· Heat was not applied to the windshield for more than 5 seconds.
· The airplane is Weight On Wheels.
If the airplane is Weight Off Wheels, the warmup
mode is terminated. Once the warmup
mode is
terminated, it automatically switches to normal regulating mode.
Normal Regulating Mode
On WTC powerup
both channels controlling the windshield and respective side window are
energized. Each channel continuously monitors the temperature through its sensor element. If the
temperature decreases below a specified low limit, the heater is turned on. If the temperature
exceeds a specified limit, the heater is turned off.
WINDSHIELD/WINDOW FAILURE INDICATION
In the event of a system failure or being turned off, a message is displayed on EICAS.
GF1410_027
L−R WINDOW HEAT FAIL
L−R WINSHLD FAIL
L WSHLD HEAT OFF
R WSHLD HEAT OFF
ICE AND RAIN PROTECTION
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
14−10−17
EICAS PHILOSOPHY
The following represents the EICAS symbols and logic for the BLEED/ANTIICE
synoptic page. The
symbols are shown in serviceable and failure conditions.
BLEED/ANTI − ICE SYSTEM LOGIC
VALVE AND FLOW LINE
OPEN
VALVE
NOT FAILED
CLOSED
TRANSIT
INVALID
VALVE
FAILED
DIRECTION OF FLOW
LOW TEMPERATURE
WAI OFF
WING LEADING EDGE
OVERHEAT
SUFFICIENT HEAT
ENGINE COWL
CAI ON CAI OFF
GF1410_028
ICE AND RAIN PROTECTION
Flight Crew Operating Manual Rev 3, Apr 25, 2005
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