Met - Airframe Icing Flashcards Preview

CPL - Meteorology > Met - Airframe Icing > Flashcards

Flashcards in Met - Airframe Icing Deck (17)
Loading flashcards...
1

What will cause a super cooled water droplet to freeze .....

any disturbance to its spherical shape

1

Why is airframe ice not possible beyond -300C .....

because all the water vapor in the air is already ice and this does not stick to the skin of the plane

2

Rime ice forms in the following types of clouds ......

1. Ac or As

2. Sc and St or Cu but only above freezing

2

Describe catch efficiency ....

the thinner the cross section the higher the catch efficency of it

3

In supercooled water droplets - the smaller the droplet the ..... the temp needs to be to freeze

lower

4

Hoar frost forms when ....

the airframe is below freezing and moves into a warmer more humid air. The moisture skips the condensation phase and moves from vapor to ice (deposition)

6

Frost is .....

frozen dew and should be removed before flight

6

for clear ice to form there needs to be 3 things .....

1. Sub zero temps

2. super cooled water droplets

3. Large water droplets

7

Supercooled water may be found at temps as low as ....

-400C

8

Describe how clear ice forms .....

Large super cooled droplets spread out before freezing onto the airframe creating a layer if clear ice

10

Rime ice creates a ..... ..... disrupting the airflow

mushroom effect

10

Describe the danger of freezing rain .....

if a plane flys through freezing rain and its airframe temp is below 00C then clear ice may form

12

clear ice needs small/large droplets

large

14

Rime ice needs small/large droplets .....

small

15

Rime ice forms on ......

leading edges and pitots

16

Clear ice forms in what types of clouds ......

Thick As or in Cu, Cb and NS above freezing

17

Rime ice forms at temps .....

-100C to -300C