Engine Instrument Systems Flashcards
Many large high-bypass turbofan engines use what type of fuel control system?
FADEC
What are the units in an engine fuel flow system?
Transmitter and Indicator
Where is the fuel flow transmitter located?
In the fuel line between the engine driven pump and the carburetor
What type of readout is indicated on a fuel flow system?
Fuel flow in pounds per hour
What exactly does a mass fuel flow transmitter measure?
Density mass of the fuel that flows through it
What is the reason for monitoring the fuel flow?
Fuel consumption and whether the engine is operating at the correct fuel-air mixture
What does a manifold pressure gauge indicate?
Absolute pressure in the intake manifold
What would be the effect of a broken manifold pressure gauge line?
The gauge will indicate atmospheric pressure
What does the engine tachometer indicate?
Crankshaft speed
What is the most likely cause of an oscillating tachometer?
Kink in the cable
What type of tachometer is used in multi-engine airplanes?
Alternating current tachometer generators
What are turbine engine tachometers designed to indicate?
Percent engine rotor shaft RPM
What is the EPR on a turbine engine?
Ratio between total turbine discharge pressure to total inlet pressure
What is the electric source for a cylinder head temperature gauge?
A thermocouple attached to the cylinder head
Where is a carburetor air temperature bulb located?
The air intake passage to the engine
How can a turbine engine EGT be checked without operating the engine?
Checking resistance to thermocouples and circuits
What is the typical acceptable resistance of a cylinder head thermocouple cable?
2 to 8 ohms
What directly controls manifold pressure?
Engine RPM and throttle opening
On an engine equipped with a fixed pitch propeller, what controls both manifold pressure and engine RPM?
Throttle Control
When checking the manifold pressure during engine operation, in what position would the prop control be set?
Low Pitch
What is the possible cause when a turboprop engine oil pressure drops off severely and the oil supply remains?
Oil pressure transmitter or indicator malfunction
Why are turbine engines measured in percent of engine performance instead of RPM?
Jet engines do not output power, but rather thrust force
