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An uphill slope runway will:
  • A
    decrease ASDR.
  • B
    increase ASDR.
  • C
    decrease ASDR only if the TOM decreases.
  • D
    increase ASDR only if the TOM increases.

Refer to figure.

For an upslope runway, we know that V1 is increased. The effect of an up or downslope on V1 is difficult to be calculated from theory alone. We suggest that you take a look at the attached figure (which can be found on CAP698, figure 4.9), where slope/wind V1 adjustment table is given.

  • A downslope (for instance, -2%) => results in a V1 reduction;
  • An upslope (for instance, 2%) => results in a V1 increase.
Considering the above:
When calculating the Accelerated Stop Distance Required, it is assumed that the engines will fail at V1. According to regulation, 2 seconds of pilot reaction are added before the operating engine is set to IDLE thrust and maximum braking applied. The distance required to bring the aircraft to a complete stop will depend (not solely) on the aircraft's speed and mass.
  • Meaning that, at a higher V1 (higher speed from which braking is applied), the stopping distance will be increased (when comparing to a lower V1).
    The overall ASDR (Accelarated Stop Distance Required) is increased for a higher V1. Consequently, an upslope runway will increase ASDR.

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