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If the take-off mass of an aeroplane is tyre speed limited, downhill slope would
  • A
    increase the maximum mass for take-off.
  • B
    increase the required take-off distance.
  • C
    have no effect on the maximum mass for take-off.
  • D
    decrease the maximum mass for take-off.

The maximum ground speed that the tyre will experience will be at VLOF, and as a result, normally tyre speed limits are designed to be greater than or equal to the fastest VLOF.
Factors that can lead to a tyre speed limited take-off:

  • Density affects the TAS for a given IAS. Reduced density will increase the true airspeed and consequently ground speed for a given indicated airspeed.
  • Tailwind increases directly the ground speed.

A downhill slope would only make us reach VLOF at a shorter distance, it would not change the speed of VLOF.

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