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temperature and manages the BIC Built-In-Test. Also, it communicates to EICAS and
stores faults in a Non-Volatile Memory (NVM) for later retrieval by CAIMS.
The left and right switches on the Windshield Heat panel, independently control power
to the left and right windshield and side window temperature controllers.
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
3-22 For Training Purposes Only
Sept 04
The heat for the windshields and side windows is supplied by electrical heaters.
The windshield is a laminated transparency comprising two acrylic mainplies and an
outer glass faceply. A conductive film is deposited on the interior surface of the
faceply except for a half-inch wide zone along its periphery. The conductive film acts
as the windshield heating element.
GX_03_024
BIC CH 1 CH 1 BIC
115 VAC
BUS 1
115 VAC
BUS 3
115 VAC ESS BUS
28 VDC ESS BUS
WOW
115 VAC BUS 2
28 VDC BUS 1
WOW
DAU 1 DAU 2
WINDSHIELD HEAT PANEL
Side
Window
Windshield
Temperature
Sensors
Heating
Element
Controllers
98°F
98°F 98°F
98°F
WINDSHIELD HEAT
L
ON
OFF/
RESET
R
ON
OFF/
RESET
For Training Purposes Only
Sept 04
3-23
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
The side window construction is similar to that of the windshield, except that the
laminated transparency comprises only two acrylic mainply layers. On the side
window, the conductive film is deposited on the interior surface of the outer mainply.
WINDSHIELD HEAT PANEL
Selections for the pilot’s and copilot’s windshield and side window heating are made
on the WINDSHIELD HEAT panel located on the overhead panel.
WINDSHIELD HEAT
L
ON
OFF/
RESET
R
ON
OFF/
RESET
GX_03_025
LEFT and RIGHT WINDSHIELD HEAT Selectors
OFF/RESET
ON
• – Turns windshield/window heat OFF
– Resets the system in the event of a failure
– Inhibits all windshield and window fail messages
• – Activates the windshield/window temperature
control system.
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
3-24 For Training Purposes Only
Sept 04
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 for approximately 4 minutes. The warm-up mode is activated on WTC power-up
under the following conditions:
• 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 warm-up mode is terminated. Once the warmup
mode is terminated, it automatically switches to normal regulating mode.
Normal Regulating Mode
On WTC power-up, 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 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 the
EICAS.
L (R) WINDOW HEAT FAIL
L (R) WSHLD HEAT FAIL
L WSHLD HEAT OFF
R WSHLD HEAT OFF
GX_03_026
For Training Purposes Only
Sept 04
3-25
P I LOT T R A I N I N G GU I D E
ANTI-ICE SYSTEM (IAMS)
ICE AND RAIN EICAS MESSAGES
789
WING A/ICE OVHT
ICE
ICE DETECTOR FAIL
L AOA HEAT FAIL
R AOA HEAT FAIL
L COWL A/ICE FAIL
R COWL A/ICE FAIL
L WINDOW HEAT FAIL
R WINDOW HEAT FAIL
L WING A/ICE FAIL
R WING A/ICE FAIL
L WSHLD HEAT FAIL
R WSHLD HEAT FAIL
PITOT 1 HT FAIL
PITOT 2 HT FAIL
PITOT 3 HT FAIL
STBY PITOT HT FAIL
WING A/ICE LO HEAT
GX_03_027
ICE
Indicates that ice has been
detected and cowl and/or wing
anti-icing system is not
operating.
L AOA HEAT FAIL
Indicates that the respective
AOA has failed.
(R)
L (R) WINDOW HEAT FAIL
Indicates that the respective
window heater temperature
controller has failed.
L WSHLD HEAT FAIL
Indicates that the respective
windshield heater temperature
controller has failed.
(R)
STBY PITOT HEAT FAIL
　
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