11.12 Ice And Rain Protection Flashcards
What temperature would water droplets be if they turned in to clear ice on the surface
Between 0 and -10 Celsius
What ice is formed on the surface if the temperature drops below -10 Celsius
Rime ice (leading edge only)
What shape does rime ice form when flying at high speeds
Double horn shape
What is the system that prevents ice build up on the leading edge
Thermal with anti icing system
Where are rotary ice detectors located
Forward fuselage close to nose
Where does the hot air for the anti icing system come from
Pneumatic system straight from engine
When the wing is equipped with slats what is necessary to supply the wing anti ice duct
Telescopic duct
Short when slats retracted, longer when slats extended
What air does the engine anti ice system use
Bleed air from the corresponding engine
Why does the wing anti icing system always only have one switch
Both wings must work symmetrically
How does a solenoid controlled valve close when there is no air pressure available
Spring force
If a solenoid is energised is it open or closed
Closed
If there is equal pressure on either side of the piston on a solenoid valve, is the valve open or closed
The spring closes the valve
What does a solenoid valve fail safe to open mean
Automatically opens if there is no electrical power
At what pressure would the pressure regulating valve drop to for wing anti icing fault light to illuminate
14 psi (however not on ground)
Is the motor operated valve in wing anti icing systems AC or DC
AC
What phase operation is used for heating, and on the ground
115v on ground
200 volts in air
What doesn’t only using the positive wave of AC on the ground for heating do
Reduces power to 50%
What is the temperature probe in the anti icing system also known as
Rosemount probe
How many holes per square inch does the TKS system (weeping wing system) have on formed titanium panels
800 laser drilled
What kind of fluid is used for chemical anti icing
Glycol based
Where do you find the heating elements for windshields in the cockpit
Behind the outer glass panel (Anti icing)
Transparent electrically conductive film
Where do you find the heating element for all other windows other than windshield
Near the inner glass panel (Prevent misting)
What does a ramp system do for window heating
Slowly heats the windows to prevent thermal shock
Takes around 4 mins
What is the target temperature of the heating film on windows
40 Celsius
What does rain repentant increase the water contact angle of glass in the window to
More than 80 degrees
What does using hydrophobic coating increase the water contact angle of glass in the window to
Up to 100 degrees
What speed window wipers is used on the ground
Slow
What must the window wiper to be used on speeds more than
250 knots
What is the park position of the window wiper
Outside of normal wiping area
