Discussion
Statement I: Flying from high pressure towards low pressure without resetting the altimeter leaves the aircraft lower than indicated.
Statement II: The instrument interprets the lower ambient pressure as greater height.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. An altimeter converts pressure to height on a fixed assumption about sea level pressure. Fly into a region where that pressure is genuinely lower and the instrument sees the reduced pressure and reports it as extra height, so the aircraft is lower than indicated. The mnemonic is high to low, look out below.
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