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Which statement is correct regarding headwind or tailwind conditions during take-off?

  • A

    Tailwind increases the obstacle clearance during take-off.

  • B

    Tailwind increases climb gradient.

  • C

    Headwind increases flight-path gradient.

  • D

    Headwind decreases climb gradient.

The flight path gradient (or Wind Effective Gradient) and the flight path angle are measured relative to the ground. So, they are affected by headwinds and tailwinds, except in a vertical climb.

The flight path gradient is given by the formula:

  • Flight Path Gradient = Rate of Climb / Groundspeed.

Thus, with headwind, the GS decreases and the flight path gradient increases. Conversely, with tailwinds, the GS increases, so the flight path gradient decreases.

Climb gradient and climb angle are measured relative to the air mass. So, they are unaffected by headwinds or tailwinds.

The climb gradient is given by the formula:

  • Climb Gradient: Rate of Climb / True Airspeed.

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