Instrumentation And Test Equipment Flashcards
What will an understanding of the operating principle of the engine instruments help you decide?
The meanings of the instrument readings
To be considered effective tools for aviators, aircraft instruments must be?
Light weight, easy to read, and small in size
Most engine monitoring gauges and instruments require some type of?
Transmitter and indicator
What does the engine fuel-flow indicting system of most jet powered aircraft contain?
Fuel-flow transmitter and a fuel-flow indicator
What fuel system component of a jet engine that operates using a water wheel concept?
Fuel-flow transmitter
What are the two units that work together to indicate the oil system correctly?
Oil transmitter and indicator
What does an oil pressure transmitter contain?
A mechanical section and a synchronous unit
Where does the oil pressure indicator receive an electrical signal from?
The transmitter
What are the two primary units of the tachometer indicating system?
Tachometer generator and indicator
What type of instrument is the tachometer indicator?
Electric magnetic-drag type
What is the frequency of the tachometer generator proportional to?
The engine speed
On engines with afterburners, the piston of the exhaust nozzle in converted into an electrical signal by a?
Transducer
During an engine operational check of the fire warning system, you press?
Only the TEST switch
What is used to indicate the amount of thrust in a dual-compressor engine producing?
Engine pressure ratio (EPR)
What does the term “Pt2” mean?
Total pressure at station 2
What are the pressures used in operation of the EPR system?
Engine inlet total pressure and exhaust total pressure
How is the inlet pressure (Pt2) transmitted from its sensing point?
Trough tubing
While testing an engine on a test cell, a breather pressure gauge displaying excessively high breather pressure is usually an indication of?
Damage to engine bearing oil seals
The direct oil pressure gauge on a test cell is connected to an engine oil pressure line to indicate oil pressure without using?
Wiring, indicator, or aircraft transmitter
What does the test cell EGT selector allow a selection of?
Individual thermocouple inputs or an average of these inputs
The test cell fuel-flow rate indicator automatically controls the solenoid valves in the fuel module in order to deliver fuel flow through the?
Flow turbines
When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in the rpm will be within?
2 rpm
The test cell instigated circuit (IC) temperature indicator displays temperature in degrees Fahrenheit, with a range of?
-50 to 1,600 degrees
What type of vibration causes unnecessary engine removals and warrant repairs?
Externally exited
What kind of engine vibration does not persist, but comes and goes?
Transient
During vibration analysis, what is frequency usually measured in?
Cycles per second
During vibration analysis, amplitude is measures in mils. What is mil equal to?
.001 inch
What two types of transducers are used to measure vibration?
Piezoelectric accelerometer and velocity
Which type of vibration transducer is made up of certain ceramic compounds and natural crystals?
Piezoelectric accelerometer
To find the instructions for installing vibration pickups at a test cell, you should check the?
Intermediate maintenance Manuel
When you are using a vibration analyzer, you should be notified when a preset signal has been exceeded by?
Flashing channel indicator LED
The filter selector switch on the vibration analyzer is used to?
Allow selection of the necessary filter
What are used to support the fan and low-pressure turbine?
Bearings
What procedure is used to ensure the fan and low-pressure turbine are correctly balanced?
Fan rotor trim balance
What jet engine temperatures are measured?
Exhaust gas, turbine inlet, and fan turbine inlet
What does a typical jet engine EGT indicating system contain?
Thermocouples, leads, an indicator, and resistor
Which metals are used in thermocouples of the EGT?
Alumel and chromel
