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Determine the true airspeed (TAS) when your indicated airspeed (IAS) is 95 kt, flying at 3000 ft where the outside air temperature is 6°C above ISA.

  • A

    99 kt

  • B

    100.5 kt

  • C

    103 kt

  • D

    104 kt

Refer to figure.
Let’s calculate the actual outside air temperature (OAT) at 3000 ft:

  • Standard ISA temperature at 3000 ft: 15 - 2 x (3000 ÷ 1000) = 9°C
  • Temperature deviation from ISA: +6°C
  • Actual OAT at 3000 ft: 9 + 6 = 15°C

To determine the true airspeed (TAS) for this scenario, use your Flight/Navigation computer:

  1. In the Airspeed Correction section, align the pressure altitude of 3000 ft with the actual OAT of +15°C.
  2. On the inner scale, set the calibrated airspeed (CAS) of 95 kt, then read the corresponding TAS on the outer scale: 100.5 kt.

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