Heating and Defrost
Aircraft heating systems in light aircraft are based on the exhaust over which cold air is blown and then fed into the cabin. CO (carbon monoxide) poisoning is a possibility when cracks are present in the exhaust.
Frost/Hoar Frost
Ice crystals that form from ice saturated air saturated with vapor at temperatures below 0°C (32°F) by direct sublimationdeposition on the ground or other exposed objects.
Frozen Contaminants ...
Frost. A condition in which the temperature of the air is below the freezing point of water.
...
When frost or dew is frozen on aircraft you should turn on pitot heat to confirm that it is both working and capable of melting any internal ice as water through the drain hole.
Arctic Frost - Attitude shown by uncooperative stewardess. (Also see "Horizontally Opposed")
Arresting Gear - Police equipment used for keeping order at airport parties.
3.13 Frost on the Wings
The Federal Aviation Regulations prohibit takeoff when there is frost adhering to the wings or control surfaces, unless it is polished smooth.
We've already had hard frost. Weekends involve "The Winter Is Coming Checklist" (get furnace filters, check anti-freeze in all the vehicles; ask kids who took my good gloves) and the joy of firewood stacking.
CONTAMINATED RUNWAY- A runway is considered contaminated whenever standing water, ice, snow, slush, frost in any form, heavy rubber, or other substances are present.
Automated airport weather stations report freezing rain via the resonant frequency of a vibrating rod. The resonant frequency decreases with increasing accretion (additional mass) of ice, hoarfrost, freezing fog, freezing drizzle, rime, or wet snow.
 See also: Aircraft, Direct, Weather, Pilot, Flight
  
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