Declared distances are defined as the distances that the aerodrome operator declares available for aircraft take-off run, take-off distance, accelerate stop distance and landing distance requirements. The distances are categorized as follows:

Takeoff run available (TORA) The length of runway declared available and suitable for the ground run of an aircraft taking off.
Takeoff distance available (TODA) The length of the takeoff run available plus the length of the clearway, if provided.
Accelerate stop distance available (ASDA) The length of the takeoff run available plus the length of the stopway, if provided.
Landing distance available (LDA) The length of the runway available and suitable for the ground run of an aircraft landing.

**Declared Distances**
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Definitions

Stopway: A rectangular area on the ground at the end of the take-off run available prepared as a suitable area in which an aeroplane can be stopped in the case of a rejected takeoff.
Clearway: A defined rectangular area over land or water under the control of the aerodrome operator, selected as a suitable area over which an aircraft may make a portion of its initial climb to a specified height.

References

AIM AGA 3.10 Declared Distances

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