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Whilst maintaining constant CAS and flight level, if OAT decreases:
  • A
    Mach number decreases.
  • B
    TAS increases.
  • C
    TAS decreases.
  • D
    Mach number increases.
If you maintain a constant CAS while the OAT decreases (air is getting denser), you will need to decrease your forward speed relative to the airflow (TAS) to pick-up the same dynamic pressure (=CAS).

 

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