When climbing through 18,000 feet, what altimeter setting should you use?

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Multiple Choice

When climbing through 18,000 feet, what altimeter setting should you use?

Explanation:
When you climb through the transition altitude (18,000 ft in many airspace regimes), you switch to a standard pressure setting so all aircraft reference the same atmospheric pressure. That standard value is 29.92 inches of mercury, which is equivalent to 1013.25 hPa. So set your altimeter to 29.92 inHg (or 1013.25 hPa if your instrument uses hPa). The other options are not the standard for this altitude: they either use nonstandard local pressure or the wrong units.

When you climb through the transition altitude (18,000 ft in many airspace regimes), you switch to a standard pressure setting so all aircraft reference the same atmospheric pressure. That standard value is 29.92 inches of mercury, which is equivalent to 1013.25 hPa. So set your altimeter to 29.92 inHg (or 1013.25 hPa if your instrument uses hPa). The other options are not the standard for this altitude: they either use nonstandard local pressure or the wrong units.

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