Icing

Question 1

What 3 conditions are necessary for air frame icing

Answer 1

1-water present in liquid state
2-ambient temp below 0
3-airframe temp below 0

Question 2

What 2 factors dictate the size of super-cooled water droplets

Answer 2

1-type of cloud
2-temp, when temp falls below -20, large SC water droplets will freeze

Question 3

1-How is Clear(Glaze) Ice formed
2-what type of cloud is it expected from
3-at what temp range is it expected

Answer 3

1-large SC water droplets impact aircraft, won’t freeze immediately, only starts freezing once latent heat is released
2-Cu, Cb, Ns
3-0°C - -20°C

Question 4

1-how does Rime Ice form
2-what temp range can it occur

Answer 4

1-SC droplet impacts airframe and freezes completely and quickly without spreading from point of impact
2-0°C - - 40°C

Question 5

By what process does Frost form

Answer 5

sublimation

Question 6

1-do larger droplets cause more/less severe icing
2-what type of icing do large drops cause
3-what type of icing do small drops cause

Answer 6

1-more severe
2-clear ice
3-rime ice