Eclipse 500 System Manual page 119

Section 6. Ice Protection
6.5 System Description
6.5.1 Windshield Heat
The left and right windshields each contain a mat with electrical heater wire
embedded into the acrylic plies in the center portion of the windshield. Windshield
temperature is automatically controlled so that the outer windshield panels maintain a
temperature above freezing. Any super-cooled water droplets remain in a liquid state
while on the windshield. Water droplets that impact the windshield either evaporate
or run to the top or side edges of the windshields where they either freeze or are
shed into the slipstream.
The ACS maintains the windshield temperature between 127°F and 140°F (53°C and
60°C) by cycling windshield heat on and off. The left and right windshield heat is
powered by separate Electronic Circuit Breakers (ECBs) so that an electrical problem
will not impact both windshields.
Windshield heat is controlled by two line select keys labeled L WSHLD AND R
WSHLD on the ICE protection synoptic. These keys allow the windshield heat to be
selected to ON or OFF. The default state for windshield heat is OFF. When activated
a WINDSHIELD HEAT MANUAL status message appears.
Operation of windshield heat is displayed on the ICE protection synoptic by
windshield outlines on plan view of the aircraft. A white windshield outline indicates
that the windshield heat is off. A green windshield outline indicates that windshield
heat is on and functioning normally.
Version 2.0 April 2007
Figure 65. Windshield Heater Mat
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