what are some of the sources used to heat the fuel in a turbine engine fuel system
bleed air and engine lubricating oil
what are the most common types of fuel metering systems used on small reciprocating engines
float type carburetors pressure injection carburetors and direct fuel injection systems
what function does the mixture control perform
it controls the fuel air mixture
what generally causes spark plug fouling
operating the engine with an excessively rich mixture at idle
what is the purpose of an accelerating system
it provides an immediate but brief increase in fuel flow in the venturi to enrich the mixture
what is a carburetor economizer system
it is a power enrichment system that provides a richer mixture at high power settings where the access fuel aids in engine cooling this system functions as throttle setting above cruise power setting
when the mixture is placed in the idle cut off position a slight rise in rpm is noted prior to the engine decelerating what does this indicate
the idle mixture is set correctly
why should engine rpm be accelerated periodically when making carburetor adjustments
to clear the engine
what maintains the fuel pressure in a pressure injection carburetor
an engine driven fuel pump
what happens if the manual makes your control of a pressure injection carburetor is moved to the idle cut off position
the engine stops
how does an automatic mixture control amc function
a sealed brass bellows connected to the fuel metering system expands and contracts with the changes in pressure and temperature adjusting the mixture accordingly
what are some of the advantages of fuel injection systems over carbureted systems
less danger of induction icing better acceleration better fuel distribution better fuel economy reduced overheating of individual cylinders
what purpose do turbine engine fuel control units serve
they automatically meter fuel to the engine
what are the two basic types of turbine engine fuel control units
hydro mechanical and electronic
what are the engine variables detected by the fuel control unit
power lever position, engine rpm, turbine inlet temperature, compressor inlet pressure, compressor discharge pressure, burner pressure
what are the two major components of a supervisory electronics engine control
the electronic control unit computer and the hydro-mechanical fuel control
what are some of the advantages of a full authority digital engine control fedex over a hydro-mechanical fuel control
better fuel economy, improved starts, requires no engine trimming, provides engine limit protection, provides constant idle speeds regardless of atmospheric conditions or bleed air requirements, fully modulates the active clearance control and allows more repeatable engine transients
what do turbine engine fuel spray nozzles do
they inject fuel into the combustion area
what are the different engine indications used for trimming a turbine engine
either epr or rpm is used depending on the particular engine
what maintenance adjustments are normally allowed on an installed hydromechanical fuel control
specific gravity for fuel idle rpm and maximum rpm or maximum epr
what type of pump can vary the amount of fuel discharged regardless of speed
a variable displacement pump
what is used to keep water sediment and foreign matter out of the carburetor
the main fuel strainer
what is the purpose of a pressure relief valve in a constant displacement pump
it returns excess fuel that is not required by the engine to the inlet side of the pump
what type of engine driven fuel pump is widely used other than gear or piston pumps
a rotary vane type
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RECIPROCATING ENGINES10
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RECIPROCATING ENGINE OPERATION27
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TURBINE ENGINES24
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TURBINE ENGINE OPERATION11
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INDUCTION SYSTEMS22
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EXHAUST SYSTEMS22
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ENGINE FUEL SYSTEMS37
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ELECTRICAL AND STARTING SYSTEMS37
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LUBRICATION SYSTEMS22
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COOLING SYSTEMS14
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ENGINE FIRE PROTECTION SYSTEMS16
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PROPELLERS22
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POWERPLANT AIRWORTHINESS10
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POWERPLANT TROUBLESHOOTING1
