ASO mod 10 - 14

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What are the purposes of oil?
- stop friction
- cooling
- cushioning effect
- sealing
- reduces wear (remove metallic particles)
What is viscosity

The measure of how resistant something is to flow
How does temperature affect viscosity

higher temperature creates a lower viscosity (flows more freely)
What are the methods of lubrication
- Splash
- Pressure
- Splash-pressure combination
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
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
What are the disadvantages of a Dry Sump system
- More components
- Increased maintenance requirements
How is AVGAS identified
- Colour
- Octane Rating (resistance to detonation (anti-knock value))
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
What is vapour lock

When the fuel vaporises when heated or surrounding pressure is reduced
What can result from vapour lock
- Difficult starting
- Slow warm up
- Poor acceleration
- Uneven fuel distribution
- Engine Failure
What happens to the mix at idle

Rich
What happens to the mix at cruise

lean
What happens to the mix at takeoff

rich
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.
What does a non-return valve do?

allows flow in only one direction
What does a mixture control do

adjusts fuel flow to the engine
What is the typical air : fuel ratio

12.5:1
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.
Why is the fuel pump engine driven

Keeps the fuel pressure proportional to engine speed
What happens if mixture is excessively rich
- loss of power
- waste of fuel
What happens if mixture is excessively lean

Engine may backfire or stop completely
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
How are the pistons cooled
- mixture cools head
- Heat is conducted through cylinder wall
- bottom and conrod cooled from the splash of wet sump
How are the inlet valves cooled

by the mixture
How are the exhaust valves cooled
- Resistant through construction
- Occasionally sodium filled
What indicates engine temperature

A thermocouple attached to one of the cylinders
What should be ensured during warm-up
- RPM between 1000 - 1600
- Monitor instruments
What does high power + low speed result in and what solutions are there
- High temperature
- Open cowl flaps
- Full rich or
- increase airspeed
What does low power + high speed result in and what solutions are there
- Low Temperature
- Closing cowl flap or
- Small bursts of power
What happens if the air filter gets blocked in the CT-4E

A manual bypass level can be operated in the cockpit
Why is the crankshaft counterweighted

Prevents torsional vibration
What spark plugs does the left magneto provide the charge to
- Left bank, lower spark plugs
- Right bank, upper spark plugs
What type of oil system does the airtrainer have
- Splash-pressure combination
- Wet sump
What type of cooling system does the airtrainer use

Air cooled

Author

mattc90

98697

Card Set

ASO mod 10 - 14

Description

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

Updated

2011-08-28T09:48:14Z