FAA figures/8080-2H/Figure 17

Figure 17: Winds and temperatures aloft forecast (FB)

FAA-CT-8080-2H · Sport, Recreational, Private & Remote Pilot supplement · asked on the Private Pilot, Private Pilot Helicopter test

FAA Figure 17Winds and temperatures aloft forecast (FB)FAA-CT-8080-2H · Sport, Recreational, Private & Remote Pilot supplement
How to read it: Each group is DDSSTT: direction (tens of degrees true), speed in knots, temperature in °C (negative above 24,000 ft). 9900 = light and variable. 7312-? means direction 230, speed 112 kt.

3 FAA questions that refer to this figure

  1. Question 1 · Private Pilot

    (Refer to FAA-CT-8080-2H, Figure 17.) What wind is forecast for STL at 12,000 feet?

    • A.230° true at 56 knots.
    • B.230° true at 39 knots.
    • C.230° magnetic at 56 knots.
    Show answer and explanation

    Correct: B. 230° true at 39 knots.

    In Figure 17 the STL entry under 12,000 feet is 2339-04: 23 = 230 degrees, 39 = 39 knots, and -04 = minus 4 degrees Celsius. Winds and temperatures aloft forecasts give direction relative to true north, so the forecast is 230 degrees true at 39 knots. 56 knots is the 18,000-foot value (2356-16), and the direction is not magnetic.

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  2. Question 2 · Private Pilot Helicopter

    (Refer to FAA-CT-8080-2H, Figure 17.) What wind is forecast for STL at 12,000 feet?

    • A.230° true at 56 knots.
    • B.230° true at 39 knots.
    • C.230° magnetic at 56 knots.
    Show answer and explanation

    Correct: B. 230° true at 39 knots.

    In Figure 17 the STL entry under 12,000 feet is 2339-04: 23 = 230 degrees, 39 = 39 knots, and -04 = minus 4 degrees Celsius. Winds and temperatures aloft forecasts give direction relative to true north, so the forecast is 230 degrees true at 39 knots. 56 knots is the 18,000-foot value (2356-16), and the direction is not magnetic.

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  3. Question 3 · Private Pilot

    (Refer to figure 17.) What wind is forecast for STL at 9,000 feet?

    • A.230° true at 32 knots.
    • B.230° true at 25 knots.
    • C.230° magnetic at 25 knots.
    Show answer and explanation

    Correct: A. 230° true at 32 knots.

    In the Figure 17 forecast the STL group under 9,000 feet is 2332+02: wind from 230 degrees true at 32 knots, temperature +2 degrees C. Winds aloft forecasts are always referenced to true north and given in knots; 25 knots is the STL value at 6,000 feet (2325).

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