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Given the following information, what is the Mach number?

FL25
OAT: -15°C
TAS: 250 kt.

  • A
    0.40
  • B
    0.39
  • C
    0.44
  • D
    0.42

TAS: 250 kts
OAT: -15˚C
LSS at 2500 feet = [√(273 - 15)] x 38.95 = 625 kts

Mach number = TAS / LSS = 250 / 625 = 0.40

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