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Which of the following constant pressure charts would be most relevant for planning a flight at FL 430?
• A
300 hPa
• B
200 hPa
• C
250 hPa
• D
150 hPa

For high-level flights, the charts cover the vertical area between FL50 to FL450 and are typically issued for the following specific FLs in Europe: 50,100,180, 240, 300, 340, 390 and 450. For low-level flights, the charts are issued typically for the following altitudes: 2000 ft, 5000 ft and 10000 ft. For the high-level charts, each FL corresponds to a specific pressure surface (pressure value):

FL50 = 850 hPa
FL100 = 700 hPa
FL140 = 600 hPa
FL180 = 500 hPa
FL240 = 400 hPa
FL300 = 300 hPa
FL340 = 250 hPa
FL390 = 200 hPa
FL450 = 150 hPa

=> When planning a flight at a specific FL for which the upper wind/temp chart is not published, you have to use the chart that is the closest to your actual planned FL. In this case, for FL430 it would be 150 hPa (FL450).

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