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A static port reads 3 hPa below the true value. Using 27 ft per hectopascal, the altimeter error is approximately

  • A.81 ft high
  • B.81 ft low
  • C.27 ft high
  • D.9 ft high

Answer: A

A lower sensed static pressure is interpreted as greater height, so the instrument over-reads by about 81 feet. The sign matters far more than the magnitude here, because it decides which side of an obstacle clearance the aircraft is on.

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