Which of the following would require an increase to the computed landing distance?

An increase to the computed landing distance is influenced by a variety of factors affecting how an aircraft decelerates upon touchdown. Tailwinds have a significant impact because they effectively increase the landing distance required for the aircraft to come to a full stop. When an aircraft lands with a tailwind, the groundspeed is higher than what it would be in a no-wind or headwind scenario, meaning it continues to travel further down the runway after touchdown.

In contrast, elements such as an uphill slope can actually decrease the landing distance because they may aid in deceleration. Headwinds can be beneficial by reducing the groundspeed at the moment of touchdown, which can also contribute to a shorter landing distance. Similarly, a no overrun scenario does not inherently increase landing distance; it is more about the conditions of the landing surface and available stopping distance.

Therefore, the correct answer focuses on the physical dynamics at play with tailwinds causing an increase in the distance needed to safely land and stop the aircraft.