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Regarding the obstacle limited take-off mass, which of the following statements is correct?
  • A
    A take-off in the direction of an obstacle is also permitted in tail wind condition.
  • B
    The obstacle limited mass can never be lower than the climb limited take-off mass.
  • C
    Wind speed plays no role when calculating this particular mass.
  • D
    The maximum bank angle which can be used is 10°.

Refer to figure.
Wind effect on the Take-Off distance

Headwinds will reduce the ground speed at the required take-off airspeed and reduce the take-off distance and it is this reason why pilots always aim to take off into wind. A tailwind does the opposite to a headwind. Tailwinds will increase the ground speed and increase the take-off distance.

Taking-off with a tailwind it is possible, but pilot must be aware that the climb gradient will decrease and may not be sufficient to cross the obstacles with a safety margin.

The Regulations for all classes of aircraft require that in calculating the take-off distance, no more than 50% of the headwind component is assumed and no less than 150% of a tailwind component is assumed. This is to allow for variations in the reported winds during take-off.

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