Hello Aviators! Let´s talk about Declared Runway Distances as ICAO defines it for performance calculations. TODA, ASDA, TORA, LDA and little bit about RESA.
Clearway is an obstacle-free area which minimum 75m either side of the extended center-line of the runway. Clearway is not included in the accelerate to stop distance calculation in case of an aborted take-off before V1.
Stopway is a pavemented area which will help the aircraft to stop in case of an aborted take-off. The Stopway needs to be wide as the runway and need to support the aircraft weight without causing damages to the airplane.
Take-Off Run Available (TORA) is the physical length of the runway where the aircraft will perform the Take-Off run. The Stopway is not included.
Take-Off Distance Available (TODA) is the length of the runway plus the Clearway if it exists.
Accelerate to Stop Distance Available (ASDA) is usually the length of the runway plus the Stopway if it is available. This distance is used to V1 calculations. As longer is the runway if it has Stopway available higher is the V1 that can be determined.
Landing Distance Available (LDA) is the declared distance available to safely landing the aircraft.
Runway End Safety Area (RESA) is an area able to safely be suitable by an aircraft in case of an overrun. RESA is not a Declared Runway Distance that´s why it can´t be used for Aircraft performance calculation.
I hope this post has helped you with your Aviation Studies.
Have Safe Flights!
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