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The reported surface wind is from 100° at 8 kt. If an aircraft is using runway 17, what is the resulting headwind component?

  • A

    1 kt

  • B

    3 kt

  • C

    6 kt

  • D

    8 kt

1. Runway direction:
Runway 17 = 170°

2. Wind direction:
100° at 8 kt

3. Angle between wind and runway (θ):
170° – 100° = 70° (wind from the left)

4. Headwind component:

  • HWC = Wind speed x cos (θ)
    HWC = 8 x cos (70°)
    HWC = 2.74 ~ 3 kt

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