101-10 Icing

Question 1

2 conditions necessary for icing

Answer 1

1. Visible water
2. Temp is less than 0 degrees C (or slightly warmer due to aerodynamic cooling

Question 2

5 effects of icing

Answer 2

LIFT & THRUST = decrease
DRAG & WEIGHT = Increase
Stall speed increases

Question 3

Structural ice is determined by …

Answer 3

Droplet size

Question 4

Clear ice

Answer 4

• from larger drops (cumulus)
• relatively clear
• difficult to remove w/ de-icing equipment

Question 5

Rime Ice

Answer 5

• from small drops (stratiform)
  -milky or opaque in color
  -freezes quickly and traps air
  -easiest to remove/protect against

Question 6

Mixed Ice

Answer 6

Combo of clear and rime
-difficult to remove
-forms irregular shape

Question 7

Frost conditions

Answer 7

Clear, stable air and light winds

Dewpoint is 0 C or lower

Reduces LIFT by 30% and increases DRAG by 40%

Question 8

De icing

Answer 8

Physically remove ice by using pneumatic boots

Question 9

Anti-icing

Answer 9

Prevent ice from forming using engine heat bled from engine compression