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Refer to figure.
Given the following information, if the maximum allowable crosswind component is 25 kt and the maximum allowable tailwind component is 10 kt according to the AFM, may the aircraft take-off safely?

Wind: 140°(M)/25 kt
Runway direction: 250°(M)

  • A

    No, because the tailwind exceeds the limit.

  • B

    Yes, because it complies with both limits.

  • C

    No, because the crosswind exceeds the limit.

  • D

    No, because both limits are exceeded.

Refer to figure.
The figure helps to determine the Head/Tailwind and Crosswind Components. This graph is not in CAP 758, but actually in CAP 698 for fixed-wing performance and according to feedback it has appeared in exam questions.

Determine the tailwind and crosswind components with the following manner:

  1. Calculate the relative direction of the wind to the runway. i.e. (wind direction - runway direction) or (runway direction - wind direction): 250°(M) - 140°(M) = 110°.
  2. Find the intersection between the windspeed arc 25 kt and the relative direction radius 110°.
  3. Draw a vertical line to intersect the horizontal axis to read the crosswind component: 23.5 kt (less than 25 kt).
  4. Draw a horixontal line to intersect the vertical axis to read the tailwind component: 8.5 kt (less than 10 kt).

Both tailwind and crosswind components are less than the maximum allowable components. Thus, the aircraft may take-off safely, because it complies with both limits.

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