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How does a downslope runway affect the take off and landing performance of an aeroplane? It…
  • A
    decreases the take off distance, and increases the landing distance.
  • B
    decreases both the take off distance and the landing distance.
  • C
    increases the take off distance, and decreases the landing distance.
  • D
    increases both the take off distance and the landing distance.

Refer to figure.

RUNWAY SLOPE impacts both the take-off and landing distances. When taking-off or landing on a sloping runway, a component of weight will act along the longitudinal axis of the airplane. This will either augment thrust, or augment drag which will increase or decrease the accelerating force.

  • When the aircraft is on a downslope, the weight component will act in the direction of thrust => adding forward force. As a result, deceleration decreases which increases landing distance and decreases take-off distance.
  • Whereas, on an upslope situation, the component of weight acts in the direction of drag (backwards along the longitudinal axis). This will result in a reduced acceleration force and, consequently, decreased landing distance and increased take-off distance.

Easy Access Rules for Air Operations
Regulation (EU) No 965/2012
AMC2 CAT.POL.A.305 Take-off

RUNWAY SLOPE
Unless otherwise specified in the AFM, or other performance or operating manuals from the manufacturer, the take-off distance should be increased by 5% for each 1% of upslope except that correction factors for runways with slopes in excess of 2% should only be applied when the operator has demonstrated to the competent authority that the necessary data in the AFM or the operations manual contain the appropriated procedures and the crew is trained to take-off in runway with slopes in excess of 2%.

AMC2 CAT.POL.A.330 Landing – dry runways
RUNWAY SLOPE

Unless otherwise specified in the AFM, or other performance or operating manuals from the manufacturer, the landing distances required should be increased by 5% for each 1% of downslope.

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