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Given the following information and using a mechanical computer, what is the change in CAS required to reduce the TAS of an aircraft from 150 kt to 105 kt?

Pressure altitude: 7 000 ft
OAT: -8ºC

  • A
    36 kt
  • B
    39 kt
  • C
    41 kt
  • D
    52 kt

Answer this question using the flight computer:

  1. In the "airspeed" window, align the temperature of -8°C with the pressure altitude of 7 000 ft.

  2. Find the TAS of 150 kt on the outer scale and read the CAS of 137 kt.

  3. Find the TAS of 105 kt on the outer scale and read the CAS of 96 kt.

  • 137 kt - 96 kt = 41 kt

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