ICE AND RAIN
PROTECTION
AIRPLANE
OPERATIONS
MANUAL
2-15-10
Page
10
Code
01 REVISION 39
AOM-145/1114
For airplanes Post-Mod. SB 145-30-0033 or with an equivalent
modification factory-incorporated, the temperature controller has two
modes of operation, defog heat and anti-ice heat mode. When the
windshield heating push button is set to ON, the controller continuously
monitors the windshield temperature; as temperature drops below
26°C (defog mode), it modulates power input to the electric conductive
grid and maintains this temperature. If ice detectors sense ice
formation, the controller automatically increase power input to maintain
the temperature at 43°C (anti-ice mode). If both ice detectors are
inoperative, the Override knob on the Overhead Panel set to ALL
position provides manual means to put both systems into anti-ice mode
automatically increasing power input to maintain the temperature at
43°C. A caution message W/S HEAT FAIL is presented on the EICAS
when a system failure is detected or the windshield temperature
exceeds 65°C.
EICAS MESSAGES
TYPE MESSAGE MEANING
CAUTION W/S 1 (2) HEAT FAIL
For airplanes Pre-Mod. SB
145-30-0033, associated
windshield heating system
failure (< 38°C) or associated
overheat condition (> 55°C).
For airplanes Post-Mod. SB
145-30-0033, associated
windshield heating system
failure or associated overheat
condition (> 65°C).
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