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The pilot of an aircraft changes its heading to the right, from 214º to 334º and makes a rate-1 turn. The duration of this manoeuvre is:
  • A
    impossible to calculate, because we need the aircraft's TAS.
  • B
    40 seconds.
  • C
    30 seconds.
  • D
    impossible to calculate, because we need the aircraft's angle of bank.

Refer to figure.
If the turn is unbalanced, an aircraft either slips into, or skids out of the turn, thereby reducing the aerodynamic efficiency of the aircraft. To help correct for these unwanted conditions, the aircraft is flown using the balance part of the turn and balance indicator

During a balanced turn the ball remains in the centre of the balance indicator and the pilot remains upright in the seat relative to the aircraft, with no tendency to lean.

Rate of turn is the measurement of how long it takes for an aircraft to turn, measured in degrees per second. This is particularly important during instrument flying where rate-1 turns are usually carried out at a rate of 3° per second. This means that the aircraft turns through 180° in 1 minute, or 360° in 2 minutes. A steeper angle of bank is required to carry out a rate-1 turn at higher airspeeds.

To solve this exercise, first we need to calculate how many degrees was the turn performed and then apply the rate of turn:

334º - 214º = 120º at 3º/second (rate-1 turn)
120/3º = 40 seconds

Note: This question is out of the scope of performance, however a student has confirmed that it appeared in their performance exam.

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