Aircraft Instrument System Flashcards
What three flight instruments are normally operated from the pitot-static system?
Vertical Speed Indicator (VSI), Altimeter, and Airspeed Indicator. VSI and Alt to the static and Airspeed to both.
What instrument indications will result if the static
pressure line becomes disconnected inside the cabin of a pressurized aircraft?
Altimeter and airspeed will read lower than normal, VSI will indicate a momentary decent then return to zero.
What is required after replacement of components connected to the pitot-static system?
Leak test.
What are the sources of power of gyroscopic instrument operation?
Vacuum, electricity or air pressure.
What causes an electric driven gyro rotor to tilt when the aircraft is turned?
This phenomenon is called gyroscopic precession.
What is used as a guide for range marking of aircraft instruments?
The Aircraft Specifications, the Type Certificate Data Sheet, and the specific aircraft Maintenance or Flight Manual.
Where are instrument range markings placed?
Outer edge of the cover glass or over the calibrations on the dial face of the instrument.
What other type of mark is required when range markings are applied to the glass instrument cover?
An index or slip mark is a white line extending from the glass cover onto the instrument case to indicate slippage of the glass. Glass slippage would cause the range markings to be in error if the markings are located on the glass.
What is a sychro-type remote indicating system?
A sychro system is an electrical system used for transmitting information on movement and position of landing gear, wing flaps, cooler doors and other movable parts of the aircraft. Autoxyn, Selsyn and Magnesyn are three such systems.
What type of fuel quantity system is an electric fuel measuring device that accurately determines the density weight of the fuel in the tanks of an aircraft?
The Capacitor fuel type quantity system.
What is meant by “swinging a compass”?
Calibration of a magnetic compass to reduce deviation caused by influences of the aircraft structure and electrical systems?
When inspecting a magnetic compass, the bowl should be filled with liquid and should not contain any bubbles or discolorations. What is the purpose of the liquid in the bowl?
To dampen the oscillations of the float.
Which instrument is used to indicate the speed of the crankshaft of a reciprocating engine and the speed of the main rotor assembly in a turbine engine?
The tachometer read in RPM (revolutions per minute).
What type of indicating system is used to indicate turbine engine exhaust gas temperature (EGT)?
A thermocouple system.
What does the manifold pressure pressure gauge indicate when the engine is not operating?
Atmospheric pressure.
