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Which hazard follows from flying from high to low pressure?

  • A.There is no hazard
  • B.The altimeter becomes unreliable and begins to fluctuate rapidly, giving no usable indication of the altitude
  • C.The altimeter over-reads so the aircraft is lower than indicated
  • D.The altimeter under-reads, so the aircraft is higher than indicated and terrain clearance is greater than expected

Answer: C

Moving into a region of lower pressure without resetting the subscale means the aircraft descends to maintain the indicated altitude, so it is lower than the instrument shows. The old aviation adage runs from high to low, look out below. The same applies to flying from warm to cold air, which is why cold weather altitude corrections are applied in mountainous terrain. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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