The calculated takeoff distance must not exceed which parameter?

The correct choice indicates that the calculated takeoff distance must not exceed the length of the runway plus any clearway available. This parameter is essential because the clearway serves as an additional safety measure that may be factored into the takeoff distance required for an aircraft.

During the takeoff phase, if an aircraft encounters an engine failure, it requires a certain distance to continue its climb safely. The clearway, which is an unobstructed area beyond the runway that can be safely used in the event of such situations, increases the overall distance available for the aircraft to achieve the necessary climb gradient. Therefore, when computing the required takeoff distance, it is crucial to consider both the runway length and any available clearway to ensure that the aircraft can safely take off without exceeding the limits set by these parameters.

By incorporating the clearway into the calculations, pilots and dispatchers can confirm that the aircraft's performance requirements are met and that there is sufficient distance available for a safe departure.