B - Turn indicator/coordinator (06-06-18) Flashcards
How many gimbals and therefore degrees of freedom does the gyro in a turn coordinator/indicator?
1 gimbal 1 degree of freedom
How does a turn indicator/coordinator work?
The gyro is mounted in a single gimbal mounted horizontally
the gimbal is held in place by a spring so that it is tied to the aircraft
in a turn in the normal axis a force is applied to the gyro which is precessed to make it rotate in a direction opposite to the turn
the spring is calibratred to stop it continuing to rotate
an arm then flips the rotation so that a needle points the same direction as the turn.
At what speed with the turn indicator/coordinator indicate correctly?
within 100kts of the calibrated speed.
Which direction is secondary precession in a turn indicator/coordinator?
The same direction as the turn
What errors are associated with a turn indicator?
under speed, under read, under time
over speed, over read, over time
delay in indication due to delay in actual turn occurring
What is the benefit of the turn coordinator over the turn indicator?
the turn coordinator’s gyro gimbal is mounted at approx 30deg inclination in pitch which reduces the delay in indication by producing a precessed force on the gyro.
What is the benefit of the turn indicator over the turn coordinator?
You can accurately interpolate between indications
whereas a turn coordinator is only accurate to one reading.
When can the reading on a turn indicator/coordinator be considered as accurate?
When the balance indicator is also showing as balanced
What is the indication of a slip on a balance indicator/turn coordinator?
the needle of the turn indicator/coordinator is the same direction as the slip ball.
How is a skid indicated on a balance indicator/turn coordinator?
the needle and ball are displaced opposite side of the instrument
What is the rule of thumb for calculating the AoB for a rate 1 turn?
(TAS/10) + 7 = AoB
approx 20 deg
