Which factor does NOT affect the time-speed-distance function in flight calculations?

The time-speed-distance function is largely determined by factors that directly influence the motion of the aircraft through the air. Groundspeed, wind velocity, and fuel consumption are all critical elements that impact how far an aircraft can travel over a specific period of time under various conditions.

Groundspeed directly affects the time duration required to reach a destination. This is because groundspeed represents the speed of the aircraft relative to the ground, which can vary due to wind conditions.

Wind velocity influences the total groundspeed by either assisting (tailwind) or hindering (headwind) the aircraft’s travel speed. Variations in wind conditions can significantly alter the estimated time of arrival.

Fuel consumption is relevant as it can limit the operational range of the aircraft. Depending on how quickly fuel is consumed, a pilot may need to factor in refueling or adjust the planned route based on fuel availability and efficiency.

In contrast, passenger count does not directly influence the time-speed-distance calculations because it does not affect the speed of the aircraft or the distance traveled. While added weight from passengers may theoretically impact fuel efficiency and therefore fuel consumption, it does not change the fundamental calculations of time in relation to speed and distance for a planned flight. Thus, passenger count is the correct choice as it does