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|  AVIATION WEATHER
CHAPTER FIVE
6.
Which precipitation best characterizes super cooled water?
a.
Hail
b.
Wet snow
c.
Heavy showers
d.
Freezing drizzle
7.
In addition to freezing temperatures, what other conditions are necessary for the formation
of ice on aircraft?
a.
Invisible moisture, and rain
b.
Visible moisture, and aircraft skin temperature below freezing
c.
Humidity above 75 percent, and aircraft skin temperature below freezing
d.
Strong head winds and clear skies
8.
An aviation hazard associated with structural icing is that it results in________________.
a.
a reduction of lift by changing the airfoil characteristics
b.
a decrease in airspeed
c.
a decrease in drag
d.
both a and c are correct
9.
Clear icing will generally be encountered between a temperature range of_____________.
a.
2 C and 10 C
b.
0 C and 10 C
c.
0 C and 20 C
d.
+2 C and 20 C
In questions 10 through 13, match the types of structural ice in column B with the correct
descriptions in column A.
B
A
10. Formed from small super-cooled water
droplets in stratiform clouds of stable air
a.
Clear icing
11. Consists of ice crystals formed by
deposition.
b.
Rime icing
12. Formed by large individual water
c.
Mixed icing
droplets freezing as they strike the aircraft
surface
d.
Frost
13. Considered to be the most frequently
encountered type of icing
Weather Hazards of Turbulence, Icing, Ceilings, Visibility, and Ash Clouds
5-31
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