Ice Crystal Icing

Question 1

What is Ice Crystal Icing?

Answer 1

Temps below freezing near convective WX, visible moisture made up of high concentrations of small ice crystals.

Question 2

ICI threat?

Answer 2

Power loss, vibration, engine damage.

Question 3

IC accumulate where?

Answer 3

*aft of engine fan in engine core.
*Fan Hub

Question 4

IC fan hub, fan ice removal?

Answer 4

NO effect, will eventually melt in clear sky

Question 5

Why difficult to detect?

Answer 5

No radar return

Question 6

Found where?

Answer 6

Above and near regions heavy precipitation

Question 7

IC stick to A/C?

Answer 7

NO

Question 8

Encounter ICI?

Answer 8

NNC

Question 9

ICI Recognizing?

Answer 9

Rain windshield @ temps to cold for liquid.
Light MOD turbulence
IMC with:
No airframe icing, no radar return
precipitation below airplane, identified by radar returns.
smell ozone or sulfur
Humidity increase
static discharge St Elmo’s Fire

Question 10

Avoid ICI?

Answer 10

IMC, avoid flying over amber/red returns, even if below.

Question 11

ICI suspected?

Answer 11

Exit laterally. Don’t climb or descend.
ICI Non N checklist