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An aircraft's indicated airspeed at a given true airspeed will, at higher altitude, be

  • A.Unchanged, since the instrument is compensated
  • B.Zero, because the pitot tube cannot function
  • C.Lower, because the air is less dense
  • D.Higher, because the air is less dense

Answer: C

The instrument responds to dynamic pressure, which falls with density, so the same true speed reads lower as height increases. Stall speed in indicated terms stays nearly constant for the same reason, which is convenient for the pilot.

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