flight instrumentsFAA-published question bank (Private Pilot, 2008)
If a pilot changes the altimeter setting from 30.11 to 29.96, what is the approximate change in indication?
A
Altimeter will indicate .15 inches Hg higher.
B
Altimeter will indicate 150 feet higher.
C
Altimeter will indicate 150 feet lower.✓ Correct Answer
Explanation
One inch of mercury corresponds to roughly 1,000 feet, so 0.01 inch is about 10 feet. Lowering the setting from 30.11 to 29.96 (0.15 inch) makes the altimeter read about 150 feet lower; the indication changes in feet, not in inches.
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