ASO mod 10 - 14

Card Set Information

ASO mod 10 - 14
2011-08-28 05:48:14

lubrication, fuel systems, engine cooling, engine accessories and classification, CT-4E engine
Show Answers:

  1. What are the purposes of oil?
    • stop friction
    • cooling
    • cushioning effect
    • sealing
    • reduces wear (remove metallic particles)
  2. What is viscosity
    The measure of how resistant something is to flow
  3. How does temperature affect viscosity
    higher temperature creates a lower viscosity (flows more freely)
  4. What are the methods of lubrication
    • Splash
    • Pressure
    • Splash-pressure combination
  5. What is a vernatherm and how does it work
    Controls the temperature of the oil by either bypassing the oil cooler or directing oil through the cooler
  6. What are the disadvantages of a Wet Sump system
    • Supply is limited by sump capacity.
    • Because of the close proximity of the oil to the working engine, the oil is continuously subject to high temperatures.
    • It is difficult to cool the oil.
    • Difficult to adapt for inverted flight
  7. What are the disadvantages of a Dry Sump system
    • More components
    • Increased maintenance requirements
  8. How is AVGAS identified
    • Colour
    • Octane Rating (resistance to detonation (anti-knock value))
  9. Where can you find the fuel type to be used
    • Replenishment Point
    • flight manual
    • S&S replenishment notes
    • NZAP procedures and practices regarding aviation fuels in RNZAF
  10. What is vapour lock
    When the fuel vaporises when heated or surrounding pressure is reduced
  11. What can result from vapour lock
    • Difficult starting
    • Slow warm up
    • Poor acceleration
    • Uneven fuel distribution
    • Engine Failure
  12. What happens to the mix at idle
  13. What happens to the mix at cruise
  14. What happens to the mix at takeoff
  15. How do you shut down the engine and why in this manner
    Lean mixture so there is no possibility of unignited charge left in the engine.
  16. What does a non-return valve do?
    allows flow in only one direction
  17. What does a mixture control do
    adjusts fuel flow to the engine
  18. What is the typical air : fuel ratio
  19. What are the disadvantages of having a carburettor in an aircraft
    • The float chamber relying on gravity acting downwards.
    • Proneness to icing
    • The impedence of air flow caused by the choke and fuel nozzles resulting in reduced volumetric efficiency.
  20. Why is the fuel pump engine driven
    Keeps the fuel pressure proportional to engine speed
  21. What happens if mixture is excessively rich
    • loss of power
    • waste of fuel
  22. What happens if mixture is excessively lean
    Engine may backfire or stop completely
  23. What are the methods of engine cooling
    • Air cool: utilises cooling fins and air directing baffles
    • Liquid: Pumps cooled water around, adds weight
    • Oil: Vents heat through oil cooler, removes 10% of heat
  24. How are the pistons cooled
    • mixture cools head
    • Heat is conducted through cylinder wall
    • bottom and conrod cooled from the splash of wet sump
  25. How are the inlet valves cooled
    by the mixture
  26. How are the exhaust valves cooled
    • Resistant through construction
    • Occasionally sodium filled
  27. What indicates engine temperature
    A thermocouple attached to one of the cylinders
  28. What should be ensured during warm-up
    • RPM between 1000 - 1600
    • Monitor instruments
  29. What does high power + low speed result in and what solutions are there
    • High temperature
    • Open cowl flaps
    • Full rich or
    • increase airspeed
  30. What does low power + high speed result in and what solutions are there
    • Low Temperature
    • Closing cowl flap or
    • Small bursts of power
  31. What happens if the air filter gets blocked in the CT-4E
    A manual bypass level can be operated in the cockpit
  32. Why is the crankshaft counterweighted
    Prevents torsional vibration
  33. What spark plugs does the left magneto provide the charge to
    • Left bank, lower spark plugs
    • Right bank, upper spark plugs
  34. What type of oil system does the airtrainer have
    • Splash-pressure combination
    • Wet sump
  35. What type of cooling system does the airtrainer use
    Air cooled