Final Flashcards
What methods are used for controlling ice on static ports?
Electrical
What keeps the pneumatic boots deflated during flight?
Suction from the engine driven vacuum pump.
What happens of the inflation of the deicer boot is cycled too late? Too early?
If it’s too late, the ice will be too thick to break off. If inflated too soon, the ice is still elastic enough to break free.
What kind of protection does Type I fluid provide?
Short term anti ice protection.
Describe Type I fluid.
Low viscosity, and considered unthickened, provides short term anti-ice protection, orange in color, sprayed on hot at high pressures.
Describe Type II fluids.
Are pseudo plastic, fluid film will remain in place until the aircraft reaches approximately 100 knots, generally white in color.
What are the effects of icing?
Decreased lift (up to 30%) Increased drag (up to 40%) Decreased prop efficiency (up to 20%) Increased stall speed (up to 20%) Increase in weight Jammed control surfaces Damage due to ice breaking loose
What are the different types of icing detection?
Visual
Electronic
Optical
C/FIMS
What is the purpose of anti ice?
To prevent ice from forming
Which ice forms when small, super cooled water is disturbed and instantly freezes?
Rime ice
What causes frost to form?
When the dew point is below the freezing point ?
Which ice forms when large water droplets freeze slowly?
Clear ice
What type of ice can form even in temperatures of to 80° in clear air?
Engine ice (carburetor ice)
How are pneumatic boots attached to the leading edges of a wing?
Adhesive, special hardware
What sources of operating air are commonly used to inflate pneumatic boots?
Air from vacuum pumps
What system is designed to prevent ice formation?
Anti ice system
What are three possible sources for hot air for a thermal anti ice system?
Bleed air, combustion heater, exhaust air
How are pitot tubes typically heated?
Electrically
What two methods are used to keep a prop ice free?
Chemical spray and electrically heated boots
What two components conduct the electrical current from the airframe to the prop assembly?
Brushes and slip rings
What means are used to prevent or control ice formation?
Heating surfaces with hot air
Heating by electrical elements
Breaking up ice formations
Chemical application
Ice and rain protection systems used on aircraft keep ice from forming on what airplane components?
Wing leading edges Horizontal and vertical stabilizer leading edges Engine cowl leading edges Props Prop spinners Air data probes Flight deck windows Water and waste system lines and drains antenna
What systems are considered thermal?
Compressor bleed air
Combustion heater air
Exhaust