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If OAT increases when at a constant Mach number:
  • A
    TAS decreases only if the flight level remains constant.
  • B
    TAS decreases.
  • C
    TAS increases.
  • D
    TAS remains constant only if the flight level remains constant.

M = TAS ÷ LSS

If the Mach number is constant, it means that the above equation needs to be balanced. If one of the variables is changing (for example TAS), the other one (LSS) needs to change in the same way to equalize the relationship.

If the OAT increases, the LSS will increase since LSS = 38.95 x √ (°K).
Therefore, in order to maintain a constant Mach number (from the above equation), we need to increase the TAS as well.

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