Aircraft Instrument Systems Flashcards
What can be used to static check a manifold pressure indicator gauge?
Current atmospheric pressure.
What flight instruments are usually connected to a pilot-static system?
Air speed, Rate of climb (vertical speed indicator), altimeter and mach meter.
Why should you avoid cleaning obstructions from the sensing holes in a pitot-static system?
The holes are aerodynamically critical.
What causes an electric-driven gyro rotor to tilt when the aircraft turned?
Gyroscopic Precession.
What indication erros may be found in altimeters?
Scale errors, hysteresis (lags), friction and installation.
What aircraft instrument can be used to check manifold pressure gauge for proper indication?
The sensitive altimeter.
What is a synchro-type remote indicating system?
A system that transmits information from one point to another point (flap position).
What does a tachometer indicate?
Crankshaft RPM or Main Turbine rotor speed IN % of RPM.
Where does an electrical resistance temperature indicator receive a signal?
From a temperature bulb OR sensitive element.
What type of indicating system is a turbine-engine exhaust gas temperature system?
A thermocouple-type system.
What methods are used to drive turn-and-bank/slip (gyroscopic turn indicator) indicators?
Vacuum, air pressure or electricity
Who is authorized to apply the range markings to an instrument dial face?
The manufacturer or certificated instrument repair station.
What does a yellow arc on an instrument dial indicate?
Caution
Why are slippage marks used on instruments glass covers?
To indicate glass rotation in the bezel
What refrences should be consulted to determine the proper range markings for aircraft instruments?
The aircraft maintenance manual, Aricraft flight manual, TCDS. Or Aircraft Specifications.
When range markings are placed on an instrument glass, what precaution must be taken?
The glass must be marked for slippage indication.
What is required after replacement of components connected to a pitot-static system?
A leak test.
What is the meaning of swinging a compass?
Correcting for deviations by adjusting the compensating magnets.
Name at least two items that should be looked for during an inspection of a magnetic compass?
(1)Security of attachment
(2) Correct readings at various headings
(3) The bowl should be full and whithout bubbles or discoloration
(4) The scale should be readable
(5) Moving parts should work easily.
In what way do magnetic fields generated by electrical equipment and steel parts in the airplane affect a magnetic compass?
Magnetic fields deflect the compass from correct alignment with the earth’s magnetic field.
What quantity is accurately measured by a capacitance-type fuel quantity indicating system?
The mass of the fuel.
