De-Ice

Question 1

When should you consider Ice shedding? and how?

Answer 1

When temp is less than 1 degrees C and in icing conditions.
With no freezing fog, bring engines up to 50% N1 for 10 seconds at least once per hour. Also apply prior to takeoff.

Question 2

When do icing conditions exist?

Answer 2

When temp is less than 10 C (OAT on ground) (TAT in flight)
And visible moisture exists (ie clouds fog precip or vis less than 1 mile.) - Or any moisture on the surface that may effect engines.

Question 3

When does Engine A/I need to be on?

Answer 3

Any time Icing conditions exist.
Does not need to be on during climb or cruise when SAT is below -40.
Must be turned on before and during descent even if temp is below -40.

Question 4

When should you turn on the Wing A/I?

Answer 4

Turn on whenever there is an indication that the airframe is icing up. May build op on visual ice detector between cockpit windshields or on windshield wipers.

Question 5

Min speed with ice accretion?

Answer 5

clean VLS +15
Any flaps V:S + 5