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Commercial Pilot Licence (CPAER) – Canada · Question

True airspeed (TAS) is generally higher than indicated airspeed (IAS) at higher altitudes because:

As altitude increases, air density decreases. Indicated airspeed is measured by the dynamic pressure, which is dependent on air density. For a given dynamic pre

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Question: True airspeed (TAS) is generally higher than indicated airspeed (IAS) at higher altitudes because:

Answer options:

  • The pitot-static system becomes less accurate
  • The true wind speed is always higher at altitude ✅ The air density is lower at higher altitudes
  • The engine operates more efficiently at higher altitudes

Correct answer: The air density is lower at higher altitudes

Explanation: As altitude increases, air density decreases. Indicated airspeed is measured by the dynamic pressure, which is dependent on air density. For a given dynamic pressure, the actual speed through the less dense air (TAS) must be higher.

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