4-5-5. ADJUSTED MINIMUM FLIGHT LEVEL

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  • 4-5-5. ADJUSTED MINIMUM FLIGHT LEVEL

    When the prescribed minimum altitude for IFR operations is at or above 18,000 feet MSL and the atmospheric pressure is less than 29.92”, add the appropriate adjustment factor from TBL 4-5-3 to the flight level equivalent of the minimum altitude in feet to determine the adjusted minimum flight level.

    TBL 4-5-3 Minimum FL Adjustment
    Altimeter Setting Adjustment Factor
    29.92” or higher None
    29.91” to 29.42” 500 feet
    29.41” to 28.92” 1000 feet
    28.91” to 28.42” 1500 feet
    28.41” to 27.92” 2000 feet
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