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Position error in the static system arises because

  • A.The instrument mechanism has friction
  • B.The pitot tube is misaligned
  • C.Air density changes with altitude
  • D.Local pressure at the port differs from free stream static

Answer: D

Flow accelerating over the fuselage changes the local pressure, and the difference varies with angle of attack and Mach number. It is the reason a calibration card exists and why the error is largest at low speed and high angle of attack.

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