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Determine the CAS, given the following information:

TAS: 180 kt
Pressure altitude: ​FL​120
Temperature: ​I​SA +20​ºC

  • A

    145 kt

  • B

    152 kt

  • C

    158 kt

  • D

    225 kt

Refer to figure.
Calculate ISA temperature at FL120: 15 - 2 x 12 = -9ºC
ISA +20ºC, therefore OAT = -9ºC + 20ºC = 11ºC

Answer this question using the Flight Computer:

  1. Align the pressure altitude window (12 000 ft) with the OAT (11ºC);

  2. Once the wheel is aligned, find the TAS of 180 kts on the outer most scale. You should then be able to read the CAS of 145 kts on the inner scale.

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