Icing

Question 1

What are the four types of icing?

Answer 1

• Hoar frost
• Clear ice
• Rime ice
• Mixed ice

Question 2

What is hoar frost?

Answer 2

Greyish-white, feathery, crystalline formation that can cover entire surface of aircraft

Question 3

What is clear ice?

Answer 3

Clear, glassy, hard ice that forms on leading edges of wings and spreads back over wing surfaces

Question 4

What can clear ice do?

Answer 4

• Change the shape of wing leading to reduction in lift
• Increase weight of aircraft resulting in higher stall speed
• Block pilot’s view

Question 5

What is rime ice?

Answer 5

Opaque, whitish, pebbly, granular type of ice that forms on leading edges of wings but does not spread back over wing surfaces

Question 6

What is mixed ice?

Answer 6

Mixture of clear and rime ice

Question 7

What are the different icing intensities?

Answer 7

• Trace
• Light
• Moderate
• Severe

Question 8

What are the requirements for ice to form?

Answer 8

• Aircraft must be flying through visible water in form of rain or cloud droplets
• When water droplets strike surface, their temperature or temperature of surface must be 0 degrees or below