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Flight rulesQuestion 77 of 934

A pilot flies below 18,000 feet MSL. To what altimeter setting must the pilot set the altimeter?

  1. The reported setting of a station within 100 nautical miles
  2. The standard setting of 29.92 inches of mercury
  3. The reported setting of the last airport where the pilot landed
  4. The reported setting of any station in the same State or territory
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Correct answer: The reported setting of a station within 100 nautical miles

Below 18,000 feet MSL, the setting must come from a station along the route and within 100 nautical miles of the aircraft.

Source: 14 CFR Part 91, § 91.121 Altimeter settings.

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Questions last reviewed: 18 October 2026