THE TURN AND SLIP INDICATOR - Dgca question bank for pilots

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#1. The rate of turn indicator uses (i) …………… which spins (ii)……………….

earth gyro Clockwise

tied gyro anti-clockwise when viewed from above

space gyroscope up and away from the pilot

rate gyro up and away from the pilot

THAP-1

T: Turn and Slip Indicator
H: Horizontal [Lateral Axis] [Pitch Axis]
A: Axis
P: Precession
1: 1 Degree of Freedom

Freedom of movement is in one plane only – Rolling Plane.

The gyroscope in a rate of turn indicator spins in one direction and points in the direction the ship or aircraft is turning.

When the ship or aircraft is traveling in a straight line, the gyroscope points straight and the pointer on the display shows zero. When the ship or aircraft turns, the gyroscope turns in the same direction and the pointer indicates the rate of turn

#2. The radius of a turn at rate 1, and TAS 360 kts is:

2nm

7.5nm

10nm

5nm

#3. When the pointer of a rate of turn indicator shows a steady rate of turn:

the spring is providing a force which produces a precession equal to the rate of turn (in the opposite direction).

the spring is providing a force which produces a precession equal to the rate of turn (in the correct direction)

the force produced by the spring is producing a precession equal to but opposite to the rate of turn is correctly banked

the calibrated spring is exerting a force about the lateral axis equal to the rate of turn

If the aircraft banks (without turning) the gyro axis
has the freedom to remain horizontal. However, if the aircraft yaws, the frame, fixed to the
airframe, applies a force in a direction where the gyro is not gimballed, and therefore has no freedom. This results in a precession which will cause the gyro to depart from the horizontal.

A spring system prevents the gyro from turning all the way to the vertical, and the amount of spring stretch is a measure of the rate of turn

#4. If the filter of the air driven rate of turn indicator becomes partially blocked:

the rate of turn indicated will be unaffected

the radius of the turn will decrease

the aircraft will turn faster than indicated

the instrument will overread

If the suction is inadequate (at high altitude, or with a choked filter, or a leaking suction tube)
with an air driven instrument, gyro rigidity will be lowered as the gyro is “underspeeding”.
Consequently the secondary precession needed to equal the aircraft turn can be generated by
a smaller secondary torque. This reduced torque will be produced by a smaller angle of gimbal
tilt, and this means that the instrument will under-read the turn rate or in otherwords aircraft is turning fatser tahn being shown in instruments.

#5. The gyro in a rate of turn indicator has (i) ………………….. operating speed than the gyros used in other instruments because (ii)…………………..

lower a higher rigidity is not required

the same it uses the property of rigidity

variable more than one rate of turn is desired

a higher a low precession rate gives a greater operating range

LOW RPM:
The gyro spins at 9000 RPM. This low RPM because:
PRINCIPLE OF OPERATION IS PRECESSION
The instrument measures the precessional rate of the gyro and indicates it as a turn.

#6. The TBI shown alongside indicates:

a rate of turn to the left, slipping in

that the aircraft will complete a turn in one minute

an aircraft taxiing and turning starboard

the aircraft is yawing to the right

When turning to the left, if the ball moves to the left, it indicates that the aircraft is slipping in the turn.

When turning to the left, if the ball moves to the right, it indicates that the aircraft is skidding out of the turn.

When turning to the left and the ball stays in the center, it indicates a well-coordinated turn.

Finish