Inflight Icing and Icing Procedures

Question 1

What temperature should inflight icing be considered under?

Answer 1

From + 10 C to -40 C

Question 2

What should aircrew try and do as much as possible?

Answer 2

Avoid the risk of icing.

Question 3

What temperature does airframe/structural icing occur?

Answer 3

0 C to -20 C

Question 4

What temperature can supercooled ice occur at?

Answer 4

-40 C

Question 5

What type of liquid occurs above 0 C?

Answer 5

Water droplets only

Question 6

What temps does Clear Ice form at?

Answer 6

0 to -10 C

Question 7

What temps does mixed clear and rime ice occur?

Answer 7

-10 C to - 15 C

Question 8

What temps does rime ice occur?

Answer 8

-15 C to -20 C

Question 9

What is the most dangerous type of icing?

Answer 9

Clear Ice

Question 10

What is a good indication that freezing rain may exist at higher altitudes?

Answer 10

Presence of ice pellets, which usually indicates below freezing cold air with a layer of warmer air above.

Question 11

What is rime ice?

Answer 11

• Rime ice is white, and has an opaque appearance with a frost-like surface.
• It has little weight and breaks away easily

Question 12

What is mixed ice?

Answer 12

Mixture of rime and clear ice.

Question 13

What is hoar frost?

Answer 13

Occurs on parked aircraft left outside on clear nights when:

• The temp falls below 0 C
• There is very little wind
• There is high humidity

Question 14

What is trace ice?

Answer 14

Ice becomes just perceptible but accumulation is very low.

Question 15

What should be done if the freezing rain is encountered?

Answer 15

Action to get out of the freezing rain.

Question 16

What occurs when stable air is lifted orographically?

Answer 16

The 0 C isotherm is lowered.

Question 17

What temperatures should engine icing be considered?

Answer 17

+ 10 C because of the venturi effect in engine intakes.

Question 18

What should you do when encountering an area of icing conditions?

Answer 18

• Avoid flight into an area where icing conditions are known to exist
• Climb
• Divert
• Continue
• Descend
• Return
• Consider using more fuel to counter the use of icing systems.

Question 19

What is the difference between anti-icing and de-icing?

Answer 19

• Removing icing after it has formed = de-icing

- Preventing icing from forming = anti-icing

Question 20

Should you use autopilot in icing conditions?

Answer 20

No, best to hand fly the aircraft so the aircraft can talk to you.