flight instrumentsFAA-published sample question (IRH, Aug 2021)
If you are not able to obtain the current altimeter setting prior to takeoff, you should set this instrument to
A
field elevation.✓ Correct Answer
B
29.92 inches Hg.
C
pressure altitude.
Explanation
If no current altimeter setting is available, 14 CFR 91.121(a)(1) requires setting the altimeter to the elevation of the departure airport. 29.92 is used at and above 18,000 feet MSL, and pressure altitude is not a setting.
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