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Which of the following is not sensed by the pitot-static system?

  • A.Vertical speed
  • B.Height above the terrain below
  • C.Pressure altitude
  • D.Indicated airspeed

Answer: B

Correct answer: Height above the terrain below

The pitot-static system senses pressure, and pressure tells you nothing about what lies underneath the aircraft. Height above terrain comes from a radio altimeter, which times a signal reflected from the ground. The other three - vertical speed, pressure altitude and indicated airspeed - are all derived from the static and total pressures.

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