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In which of the following cases will ASDA, LDA, TODA and TORA have the same length?
  • A
    Stopway and clearway are equal but no displaced threshold.
  • B
    No stopway, no clearway, no displaced threshold.
  • C
    Stopway and clearway equal and a displaced threshold is available.
  • D
    No stopway but a clearway and a displaced threshold are available.

Refer to figure.

ICAO Annex 14
Declared distances.

a) Take-off run available (TORA). The length of runway declared available and suitable for the ground run of an aeroplane taking off.
b) Take-off distance available (TODA). The length of the take-off run available plus the length of the clearway, if provided.
c) Accelerate-stop distance available (ASDA). The length of the take-off run available plus the length of the stopway, if provided.
d) Landing distance available (LDA). The length of runway which is declared available and suitable for the ground run of an aeroplane landing.

TODA = TORA + clearway
ASDA = TORA + stopway
LDA = declared distance from the Landing Threshold to the opposite runway Threshold or, to the opposite Displaced Threshold if provided.

  • ASDA = LDA = TODA = TORA, if no stopway, no clearway, no displaced threshold.

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