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Discussion

The airspeed indicator measures

  • A.The rate of change of total pressure
  • B.The difference between total and static pressure
  • C.Total pressure alone
  • D.Static pressure alone

Answer: B

The capsule is fed pitot pressure and the case is fed static, so the deflection responds to dynamic pressure. Because dynamic pressure depends on density, the reading is not true airspeed except at sea level in the standard atmosphere.

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