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A tall aircraft flying into colder air is higher than its altimeter indicates. Is this correct?

  • A.No, it is lower than indicated in colder air
  • B.Yes, cold air raises the true altitude
  • C.Yes, provided the QNH is correct
  • D.No, temperature has no effect

Answer: A

Cold air is denser, so a given pressure occurs at a lower height than the standard atmosphere assumes. True altitude is therefore below the indication, in the same direction as the error from flying towards lower pressure.

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