How is the takeoff distance available (TODA) defined?

The takeoff distance available (TODA) is defined as the usable runway length plus the clearway length available. This measurement is critical for pilots during the takeoff phase, as it informs them of the maximum distance available to achieve liftoff safely.

The clearway is an area beyond the runway that is free of obstacles and can be used to provide additional distance for aircraft to accelerate before becoming airborne. By combining the usable length of the runway with the clearway length, TODA gives pilots a more accurate view of the total space available for a successful takeoff, especially when accounting for various factors like aircraft weight and environmental conditions.

Having a clear understanding of TODA is vital for flight safety and performance calculations, allowing pilots to determine if the conditions satisfy the requirements for a safe takeoff.