4-5-4. LOWEST USABLE FLIGHT LEVEL

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  • 4-5-4. LOWEST USABLE FLIGHT LEVEL

    If a change in atmospheric pressure affects a usable flight level in your area of jurisdiction, use TBL 4-5-2 to determine the lowest usable flight level to clear aircraft at or above 18,000 feet MSL.

    TBL 4-5-2 Lowest Usable FL
    Altimeter Setting Lowest Usable FL
    29.92” or higher 180
    29.91” to 28.92” 190
    28.91” to 27.92” 200
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