30 Questions
What is the primary function of a gimbal in a gyroscope?
To provide freedom of movement about one or more perpendicular axes
A gyroscope has how many degrees of freedom?
Three
What is the purpose of the inner gimbal in a gyroscope?
To pivot the frame and create the second axis of freedom
What is the result of a gyro not having a gimbal to provide freedom about the other two axes?
The gyro has no freedom about the other two axes
What is the axis of spin in a gyroscope?
The line from X to X1
Why can a gyro not detect movement about its plane of spin?
Because it is spinning rapidly about its axis
What is the primary purpose of caging an attitude gyro during aerobatic manoeuvres?
To prevent damage to the instrument
What is the maximum pitch attitude limit for modern attitude gyro instruments?
85 degrees nose up or nose down from level flight
What is the primary function of a caging knob in a directional gyro?
To reset the magnetic heading
What is the primary advantage of high-speed, self-erecting mechanisms in modern attitude gyro instruments?
They eliminate the need for manual caging
What is the source of air pressure or vacuum for air-driven gyro rotors?
Engine-driven pump
What is the primary difference between older and modern attitude gyro instruments?
Modern instruments have complete freedom in the roll axis
What is the primary function of pressurised air or vacuum air in air-driven gyro systems?
To spin the gyro rotor to speed and reference the gyro to the Earth
What is a major disadvantage of vacuum-driven gyroscopic instruments at high altitudes?
Decrease in rotor speeds affecting gyroscopic stability
What is a common issue with the venturi system used in early aircraft to provide vacuum for gyros?
It does not produce suction until the aircraft achieves a reasonable airspeed
What is the primary reason for using filters in air-driven gyro systems?
To prevent contamination from entering the gyro
What is the unit of measurement used to describe the level of vacuum produced by the venturi system?
Inches of mercury
What is a potential issue with the air passing through bearings in air-driven gyro systems?
It can cause contamination by corrosion and dirt particles
What happens to the connections on the case of a gyro when it is supplied with air pressure?
They are reversed.
What is the purpose of orifice 'B' in the flapper door erection system?
To allow air to escape and provide a precessing force.
What is a major problem associated with air-driven instruments?
Dirt and dust accumulation.
What type of power supply is required by high-speed rotors in electrically-driven gyros?
115-V, 400Hz, three-phase AC.
What type of power supply can be used by lower speed rate gyros?
14/28-V DC.
What type of current is used in later types of turn and bank indicators?
Alternating current.
How quickly can some newer aircraft gyros with dynamic braking run down?
Within 1 minute
What is a major problem with air-driven instruments?
Dirt and dust
When caging a gyro, what should be aligned at 90° to each other?
The gimbals
What is the recommended way to transport a gyro to and from the aircraft?
In its original shipping container
Why should gyros be handled carefully?
Because they are delicate and can be damaged
What is the minimum amount of foam rubber required between the gyroscope and the shipping container's outer shell when shipping a gyro?
100 mm
Test your knowledge of aircraft gyros, including their maintenance and pre-flight checks. Learn about the importance of filters and dynamic braking in these instruments. Prepare for your aviation exam or learn more about aircraft systems.
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