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An aircraft at high altitude is being flown at a constant indicated airspeed during a climb. The crew is asked whether the aircraft is accelerating.

What is the correct answer?

  • A.No, true airspeed falls as density falls
  • B.Only if the wind changes
  • C.Yes, true airspeed rises as density falls
  • D.No, constant indicated airspeed means constant true airspeed

Answer: C

True airspeed is equivalent airspeed divided by the square root of the density ratio, and that ratio falls throughout the climb. This is why a climb schedule switches from constant indicated airspeed to constant Mach number at the crossover altitude.

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