unit 2 Flashcards
To be considered effective tools for aviators, aircraft instruments must be light weight, easy to read and
be small in size
Understanding the operating principles of engine instruments help you decide
the meaning of the instrument readings
Most engine-monitoring gauges and instruments require some type of
transmitter and indicator
Which jet engine temperature is not measured
combustion inlet
A typical jet engine EGT indicating system contains thermocouples, leads, an indicator, and
a resistor
Which metals are used in the EGT indicating system thermocouples?
Alumel and chromel
Most jet-powered aircraft engine fuel-flow indicating systems contain a fuel-flow
transmitter and fuel-flow indicator
The fuel-flow indicator indicates the rate of fuel flow as
pounds per hour
The oil pressure indicator receives an electrical signal from the
transmitter
The tachometer indicating system’s two primary units are the tachometer generator and tachometer
indicator
The N2 tachometer generator is usually driven from the tachometer drive located on the
engine accessory section
The tachometer generator’s frequency is proportional to the
engine speed
What converts the exhaust nozzle’s position on engines with afterburners into an electrical signal?
Transducer
One type of overheat detector unit used on aircraft engines consists of a hollow stainless-steel tube that covers
two silver contacts
For an operational check of the fire warning system, you press
only the TEST switch
What indicates the amount of thrust a dual-compressor engine is producing?
EPR
The term Pt2 means the
total (t) pressure (P) at station 2 (2)
How is inlet PT2 transmitted from its sensing point?
Through tubing
When connected to an engine oil pressure line the direct oil pressure gauge on a test cell indicates oil pressure without using wiring, indicator, or
aircraft transmitter
The test cell’s EGT selector allows selecting
individual thermocouple inputs or an average of these inputs
The test cell fuel-flow rate indicator automatically controls the fuel module’s solenoid valves in order to divert fuel flow through the
flow turbines
The display range of the test cell IC temperature indicator is
-50 to +1,600 degree F
What engine vibration usually causes the most concern?
Forced
What type of vibration causes unnecessary engine removals and unwarranted repairs?
externally excited
What engine vibration does not persist, but comes and goes?
Transient
In vibration analysis, frequency is usually measured in
cycles per second
Which type of vibration transducer is made of certain ceramic compounds and natural crystals?
Piezoelectric accelerometer
Where do you find the instructions for installing vibration pickups at the test cell?
Intermediate maintenance manual
When using a vibration analyzer how are you notified when a preset signal has been exceeded?
A flashing channel indicator LED
What supports the fan and low-pressure turbine?
Bearings
What procedure ensures that the fan and low-pressure turbine are correctly balanced?
Fan rotor trim balance
