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Refer to figure.
Is this configuration compliant with the international regulations?

  • A

    Compliant with the regulations stated in ICAO Annex 14.

  • B

    Non-compliant because the stopway must be narrower than the runway.

  • C

    Compliant only if the stopway is not included in the ASDA, as it is the same width as the runway.

  • D

    Non-compliant because the TODA must always include the stopway if it is present.

Refer to figure. 
ICAO Annex 14 Vol I 
1.1 Definitions 
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.


The key point is that a clearway and a stopway serve different operational purposes and are applied differently when establishing declared distances:

  • TORA uses the runway only.
  • TODA = TORA + clearway (if provided): The clearway is a defined area over which an aeroplane may make a portion of its initial climb. Where no clearway is provided, TODA = TORA.
  • ASDA = TORA + stopway (if provided): The stopway is a prepared, load-bearing area of the same width as the runway, designed to provide additional stopping distance in the event of an aborted take-off.
  • LDA is the runway length available and suitable for landing an aircraft and it uses only runway. 

Therefore, a stopway does not automatically constitute a clearway and is not included in TODA. It is included in ASDA.

In the figure, the stopway is located beyond the runway and is included only in ASDA, while TODA = TORA because no clearway is provided. The configuration is therefore consistent with the declared-distance principles illustrated in ICAO Annex 14, Attachment A, Figure A-1, which is the figure above.

Therefore, the configuration is compliant with the regulations stated in ICAO Annex 14.

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