Cessna 310 1975 Owner's Manual page 125

Norm a I 0 per at ion
To operate the windshield deice system, proceed as
follows:
(1) Windshield Deice Switch Breaker - ON.
NOTE
For operation in continuous enroute icing
conditions, allow approximately
1/8
to
1/4
inch of ice to accumulate. The windshield
deice system can be used as an anti-ice
system by continuous use and should be so
used during the approach to landing.
However, the maximum endurance with a
3-
gallon tank is approximately 1.0 hour of
continuous operation. Airspeed should be
140 KIAS
or below for best results.
(2)
Windshield - CHECK (allow approximately 10 seconds
for alcohol flow to begin).
(3)
When windshield ice is removed, windshield deice
switch breaker OFF.
WARNING
The windshield deice switch breaker must be
positioned OFF 20 seconds prior to reaching
minimum descent altitude. The alcohol film
must be allowed to evaporate before a clear
field of vision through the windshield is
available.
EMERGENCY PROCEDURES
Abnormal operation of the alcohol windshield deice
system is indicated by the switch breaker tripping to the OFF
position or failure of alcohol to flow onto the windshield.
Do not leave system on more than
3
minutes without alcohol
flow.
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