Powerplant
What is the four stroke cycle of a piston engine?
1. Intake
2. Compression
3. Combustion(Power)
4. Exhaust
How many volts is the electrical system?
28V
Cools, Cleans, Lubricates, Seals, and helps prevent corrosion.
On small aircraft, hydraulic fluid is primarily used for what? (3 things)
Brakes, retractable landing gear, and constant speed propellers.
What is the diameter of our propeller?
76 inches
Define direct drive.
Crankshaft rotates at same speed as the propeller.
List all 6 electrical busses.
Avionics 1
Avionics 2
Essential
Crossfeed
Electrical 1
Electrical 2
When the aircraft operates below 3000ft msl the mixture should be ___?
Full rich
The brakes are actuated by doing what?
Pressing the top of the rudder pedals.
Define a fixed pitch propeller? What is ours set to?
Fixed in a set position by the manufacturer.
Climb.
What grounds the magnetos?
P-Lead
Why is there a difference in voltage between the alternator and both batteries?
To allow the alternator to fully charge the batteries.
What kind of oil sump do we have? Define what it means.
Wet sump. Wet sump stores oil in a pan below the engine while a dry sump pumps it to a separate unit.
If only the nose gear is stuck in the up position, you should __?
Hold the nose of the aircraft up for as long as possible when landing.
Why is our propeller blade twisted? Draw on the board.
Create equal amounts of thrust.
What is the tolerance for the magneto check in the engine run up checklist? (Hint ERAU SOPA)
No more than 175 RPM drop on either mag. No more than 50 RPM difference between either.
What is the definition of volts and amps?
Volts: Measure of electrical potential
Amps: Measure of amount of electricity charging or discharging.
What is the ideal fuel/air ratio?
15:1 (stoichiometric ratio)
Describe how the C172S brake system works?
Press on the brake pedals, master cylinder sends hydraulic pressure to brake caliper, squeezes the brake pads, and slows rotation of the wheel.
With a constant speed propeller, if there is a larger blade angle (higher AOA) the prop will grab ___ air resulting in a ___ RPM.
More
Lower
What is the difference between pre-ignition and detonation?
Pre-ignition: Mixture ignites before combustion phase.
Detonation: Hot cylinder ignites fuel air vapor after combustion phase.
What is on the essential bus? (6 things)
PFD, ADC/AHRS. NAV 1/engine, COM 1, STBY Light, STBY battery.
Draw out the fuel system.
(reference PIM diagram)
SUPER HARD QUESTION INCOMING
In a constant speed propeller system, which levers control RPM, Manifold Pressure, and Mixture?
Blue: RPM
Black: MAP
Red: Mixture