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An aircraft is flying at FL70 at an OAT of +25°C. Determine the change in TAS when the CAS is reduced from 130 kts to 105 kts:
  • A
    26 kt.
  • B
    27 kt.
  • C
    29 kt.
  • D
    22 kt.

In order to calculate the change in TAS, we must determine TAS for a 130 kt CAS and 105 kt CAS:

Using the flight computer:

(1) Align +25˚C with 7 000 feet pressure altitude.
(2) CAS is taken from the in the inner ring and the corresponding TAS is read in the outer circle:
  • For 130 kt CAS, TAS equals 150 kt.
  • For 105 kt CAS, TAS equals 121 kt.
TAS REDUCTION = 150 kt - 121 kt = 29 kt

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