Powerplant - Engine Instrument Systems Flashcards
What are the main units in an engine fuel flow system?
The system consists of a transmitter and an indicator for each engine
What type of readout is indicated on a fuel flow system?
The indicator is calibrated to record the flow of pounds of fuel per hour
What is the reason for monitoring fuel flow?
other than fuel consumption, whether the engine is operating at the correct fuel-air mixture for a given power setting
What does a manifold pressure gauge indicate?
It measures absolute pressure in the intake manifold
What would be the effect of a broken manifold pressure gauge line?
A broken line will cause the gauge to indicate atmospheric pressure
What does a reciprocating engine tachometer indicate?
crankshaft RPM speed
What are turbine engine tachometers designed to indicate?
They are designed to indicate percent of rotor RPM
What is turbojet EPR? (engine pressure ratio)
The ratio between total inlet pressure and total turbine discharge pressure and is an indication of thrust being developed by the engine
How can turbine engine EGT be checked without operating the engine?
By checking the resistance to thermocouples and circuits.
What exactly does a mass fuel flow transmitter measure?
The density mass of the fuel that flows through it.
What is the most likely cause of a oscillating tachometer?
A kink in the cable.
What type of tachometer is used in multi engine airplanes?
Alternating current tachometer generators.
What is the electrical source for a cylinder head temperature gauge?
A thermocouple attached to the cylinder head.
Where is a carburetor air temperature bulb located?
Located in the air intake passage to the engine
What is the typical acceptable resistance of a cylinder head thermocouple cable?
20 to 8 ohms
