30 Questions
What is the result of a higher rate of movement on a gyro?
Greater inertial force is applied
What are the two essential reference datums established by aircraft gyroscopes?
Pitch and roll attitude changes, and directional changes
How do gyroscopes maintain a stabilised reference datum?
By using the fundamental properties of rigidity and precession
What is the purpose of applying fixed torques to a horizontal-axis gyroscope?
To control the effects of drift
What is the effect of precession on a gyroscope?
It causes the gyroscope to change direction
How can a gyroscope be referenced to the centre of the Earth?
By referencing the gyro to the centre of the Earth
What is a major limitation of a simple direct current damping system in a gyro?
Insufficient inertia for an artificial horizon
What is an advantage of alternating current over direct current in a gyro?
Greater inertia and rigidity
Why is it important to wait at least 30 minutes before removing a gyro from an aircraft?
To avoid damaging the gimbals and bearings
What is a disadvantage of alternating current in a gyro?
More complex construction
What is a common problem associated with direct current damping systems in gyros?
Commutator and brush wear
What is a general characteristic of gyros in terms of their power source?
They are sensitive to changes in power supply
What is the function of the pendulous vane assembly in the fixed sky plate artificial horizon?
To generate a torque to precess the gyro
What is the purpose of the mechanical stop in the fixed sky plate artificial horizon?
To prevent gimbal lock
What is the function of the roll angle pointer in the fixed sky plate artificial horizon?
To read the roll angle against a fixed scale
What is the purpose of the sky plate in the fixed sky plate artificial horizon?
To provide a fixed reference for the roll angle pointer
How does the air used to rotate the gyro rotor escape in the fixed sky plate artificial horizon?
Through the opened slots
What is the result of the inner or outer gimbal not being at vertical in the fixed sky plate artificial horizon?
One vane of a pair covers the slot, while the other vane opens the slot
What determines the direction of the pointer's movement in an air-driven turn-and-slip indicator?
The direction of precession force
What governs the rotor speed in an air-driven turn-and-slip indicator?
The regulator in the supply line
What happens to the gimbal when the rate of turn is increased?
It tilts further against spring pressure
What is the purpose of the restraining spring in an air-driven turn-and-slip indicator?
To allow the indicator to display turns to the left or right
What happens to the gyro when the turning motion ends?
It returns to its original attitude
What is the purpose of the centrifugal cut-outs in an electrically-powered turn-and-slip indicator?
To regulate the rotor speed
What is the purpose of the lubber line on the horizontal situation indicator?
To indicate the nose of the aircraft
What does the 'mag' or 'true' flag indicate behind the lubber line?
The type of heading information being displayed
What is the function of the course pointer on the horizontal situation indicator?
To indicate the selected bearing to the station or waypoint
What is an additional feature that an Electronic Horizontal Situation Indicator (EHSI) may offer?
A moving map display with superimposed weather radar information
What is the source of the aircraft heading information on the horizontal situation indicator?
The inertial navigation system
What is the purpose of the heading bug on the horizontal situation indicator?
To indicate the desired heading
Learn about the principles of gyroscopes in aircraft, including their applications, inertial forces, and precession. Understand how gyroscopes establish reference datums for pitch and roll attitude changes in aeroplanes.
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