11.12 Ice And Rain Protection

Question 1

What temperature would water droplets be if they turned in to clear ice on the surface

Answer 1

Between 0 and -10 Celsius

Question 2

What ice is formed on the surface if the temperature drops below -10 Celsius

Answer 2

Rime ice (leading edge only)

Question 3

What shape does rime ice form when flying at high speeds

Answer 3

Double horn shape

Question 4

What is the system that prevents ice build up on the leading edge

Answer 4

Thermal with anti icing system

Question 5

Where are rotary ice detectors located

Answer 5

Forward fuselage close to nose

Question 6

Where does the hot air for the anti icing system come from

Answer 6

Pneumatic system straight from engine

Question 7

When the wing is equipped with slats what is necessary to supply the wing anti ice duct

Answer 7

Telescopic duct

Short when slats retracted, longer when slats extended

Question 8

What air does the engine anti ice system use

Answer 8

Bleed air from the corresponding engine

Question 9

Why does the wing anti icing system always only have one switch

Answer 9

Both wings must work symmetrically

Question 10

How does a solenoid controlled valve close when there is no air pressure available

Answer 10

Spring force

Question 11

If a solenoid is energised is it open or closed

Answer 11

Closed

Question 12

If there is equal pressure on either side of the piston on a solenoid valve, is the valve open or closed

Answer 12

The spring closes the valve

Question 13

What does a solenoid valve fail safe to open mean

Answer 13

Automatically opens if there is no electrical power

Question 14

At what pressure would the pressure regulating valve drop to for wing anti icing fault light to illuminate

Answer 14

14 psi (however not on ground)

Question 15

Is the motor operated valve in wing anti icing systems AC or DC

Answer 15

AC

Question 16

What phase operation is used for heating, and on the ground

Answer 16

115v on ground

200 volts in air

Question 17

What doesn’t only using the positive wave of AC on the ground for heating do

Answer 17

Reduces power to 50%

Question 18

What is the temperature probe in the anti icing system also known as

Answer 18

Rosemount probe

Question 19

How many holes per square inch does the TKS system (weeping wing system) have on formed titanium panels

Answer 19

800 laser drilled

Question 20

What kind of fluid is used for chemical anti icing

Answer 20

Glycol based

Question 21

Where do you find the heating elements for windshields in the cockpit

Answer 21

Behind the outer glass panel (Anti icing)

Transparent electrically conductive film

Question 22

Where do you find the heating element for all other windows other than windshield

Answer 22

Near the inner glass panel (Prevent misting)

Question 23

What does a ramp system do for window heating

Answer 23

Slowly heats the windows to prevent thermal shock

Takes around 4 mins

Question 24

What is the target temperature of the heating film on windows

Answer 24

40 Celsius

Question 25

What does rain repentant increase the water contact angle of glass in the window to

Answer 25

More than 80 degrees

Question 26

What does using hydrophobic coating increase the water contact angle of glass in the window to

Answer 26

Up to 100 degrees

Question 27

What speed window wipers is used on the ground

Answer 27

Slow

Question 28

What must the window wiper to be used on speeds more than

Answer 28

250 knots

Question 29

What is the park position of the window wiper

Answer 29

Outside of normal wiping area