33/34 Deicing & Anti-Icing

Question 1

How does icing on the leading edge and top surface of a wing, about like medium-coarse sandpaper degrade it’s lift and drag respectively?

[WOP 1-5, NTSB Reports]

Answer 1

30%, 40%

Question 2

Ice equal to a grain of salt every sq cm on a wing can cause a lift reduction of?

[Comply365 Module, NTSB Reports]

Answer 2

22% in ground effect

33% in free air

Question 3

What type of fluids are used for De-Ice?

[WOP Manual]

Answer 3

Heated Type I, diluted with water

Question 4

What type of Anti-Icing fluid provides the longest holdover time?

[WOP Manual]

Answer 4

Type IV, cold

Question 5

What fluid is approved to de-ice engines?

[WOP Manual]

Answer 5

Hot air

Question 6

What factors affect holdover time? (4)

[Any Holdover Table]

Answer 6

Type of fluid and concentration
Type of precipitation
Intensity of precipitation
OAT

Question 7

How do you determine snowfall intensity for the purpose of holdover tables?

[FAA, WOP Manual]

Answer 7

Use the “Snowfall Intensities As A Function Of Prevailing Visibility” table, in the QRH/WOP

Question 8

When is a tactile check required to check for aircraft contamination?

[WOP Manual]

Answer 8

When a visible check can not determine if the surface is contaminated

Question 9

What is the difference between a Pre-Takeoff Check and a Pre-Takeoff Contamination Check?

[WOP 4-4]

Answer 9

The first is done from the cockpit visually, the latter is done by trained personnel outside the aircraft

Question 10

Following a Pre-Takeoff Contamination check, within how many minutes must the aircraft be airborne?

[WOP 4-4]

Answer 10

5