Which factor is NOT considered when calculating takeoff distance?

When calculating takeoff distance, various environmental and performance-related factors come into play, including aircraft weight, wind conditions, and runway slope. Aircraft weight is crucial because a heavier aircraft requires a longer distance to reach takeoff speed due to the increased lift needed. Wind conditions also affect takeoff distance, as a headwind can reduce the distance required for takeoff by assisting in achieving lift more quickly, while a tailwind can increase the distance needed.

Runway slope is another important factor; an uphill slope increases the takeoff distance required, whereas a downhill slope can decrease it. These factors directly influence the aerodynamic performance of the aircraft during the critical takeoff phase.

In contrast, the pilot's experience level does not directly influence the calculated takeoff distance itself. While an experienced pilot may execute a takeoff more efficiently or safely handle adverse situations, the mathematical parameters and physical laws governing takeoff distance remain constant and are independent of the pilot's skill level. Thus, pilot experience is not a factor included in the calculations for takeoff distance.