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Given the following data, the calibrated airspeed (KCAS) is…

Flaps up
KIAS 57 kt

  • A

    61 kts

  • B

    59 kts

  • C

    63 kts

  • D

    55 kts

Refer to figure.
Flaps UP section. 

Interpolate between KIAS 50 (KCAS 56) and KIAS 60 (KCAS 63).

KIAS 57 is 7/10 of the way from 50 to 60.

KCAS = 56 + (7/10) x (63 - 56) = 56 + 4.9 = 60.9 ≈ 61 kts

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