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The Mach number is equal to:
"a" indicates the local speed of sound.
  • A
    EAS/a
  • B
    IAS/a
  • C
    TAS/a
  • D
    CAS/a

M = TAS ÷ LSS

The LSS is directly proportional to temperature:

LSS = 38.95 x √ (°K)

Therefore, the Mach number is:

  • Directly proportional to the TAS. An increase in TAS results in an increase of the Mach number.
  • Inversely proportional to the LSS. An increase in LSS results in a decrease in the Mach number.

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