Declared Distances

AVIATION & AERONAUTIC CALCULATOR Declared Distances A precise tool.
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What is the Declared Distances & How does it work?

The Take-Off Run Available (TORA) is the distance required for an aircraft to accelerate from a standstill, reach the decision speed (V1), and either continue the take-off or abort it safely.

Take-Off Distance Available (TODA) extends TORA by including the clearway available for use during the take-off roll. This allows the aircraft to accelerate to a higher speed before reaching V1, improving safety and performance.

Accelerate-Stop Distance Available (ASDA) is similar to TODA but also includes the stopway. It represents the total distance available for an aircraft to accelerate to take-off speed and stop in case of an engine failure during the take-off roll.

LDA = TORA – Delta L
LDA = Landing Distance Available, TORA = Take-Off Run Available, Delta L = Obstacle clearance distance
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Frequently Asked Questions
What is Take-Off Run Available (TORA)?
TORA is the distance required for an aircraft to accelerate from a standstill, reach V1, and either continue the take-off or abort it safely.
How does TODA differ from TORA?
TODA extends TORA by including the clearway available for use during the take-off roll, allowing the aircraft to accelerate to a higher speed before reaching V1.
What is Accelerate-Stop Distance Available (ASDA)?
ASDA is similar to TODA but also includes the stopway available for use in case of an aborted take-off, providing additional safety margin.
Why is it important to calculate TORA, TODA, and ASDA?
Calculating these distances ensures that aircraft have sufficient runway length for safe take-offs under various conditions, improving overall aviation safety.
Can I use this calculator for any type of aircraft?
This calculator is designed for general aviation and commercial aircraft, but specific adjustments may be needed based on the aircraft’s performance data.
What factors should I consider when using this calculator?
Consider factors such as runway slope, temperature, humidity, and aircraft weight to ensure accurate calculations.
How do I interpret the results from this calculator?
The results provide the available distances for take-off. Ensure these distances meet or exceed the minimum required by your aircraft’s specifications for safe operations.

Results are for informational purposes only and do not constitute professional advice.