#2 Flashcards
Carburetor
- Susceptible to icing due to the low pressure of the venturi
- Exhaust heater shroud used for heating carburetor and for cabin heat
- Carburetor heat unfiltered air, when carb head is on, unfiltered air travels through carburetor and filtered air is shutoff creating redundancy
Carburetor Icing Types
Impact ice, Fuel Ice, Throttle Ice
Impact Ice Cause
Found by impact of moist air at temperatures between 15F - 32F on aircoops, throttle plates, heat valves, etc. Usually forms when visible moisture such as rain, sleet, or clouds present
Fuel Ice Cause
Forms at downstream of the point where fuel is introduced and occurs when the moisture content of the air freezes as a result of cooling caused by vaporization. Usually occurs at 40F - 80F. Occurs when relative humidity is more then 50%
Throttle Ice
Forms at or near a partly closed throttle. The water vapor in the induction air condenses and freezes due to the venturi effect cooling as the air passes the throttle valve. Temperature drop is usually 5F, at combination of fuel and throttle ice can occur at high ambient temperatures
Carburetor Venturi
Accelerates air and draws fuel out nozzle to mix with air by creating a low pressure. Creating a temperature drop
Alternator of C172M
14volts/60amps
- Provides charge to battery and 14v to entire electrical system
- Only one alternator no redundancy
- Battery 12 Volts
Circuit Breakers
Circuit breakers protect the system
- Only reset popped CB once if absolutely necessary
- Resetting CB twice could lead to electrical fire
Electrical Components
Flaps, Turn Coordinator, Radios/GPS/Transponder, Fuel Gauges, Oil Temperature Gauge
Dual Ignition System/Magnetos
1 magneto controls 1 spark plug in each cylinder
- Magnetos use magnets that continually provide spark without the need for outside source of electrical power
- Does not require Battery Power
- Self Exciting
- Can only stop by grounding the magnetos (OFF)
