How much does the landing distance increase for every 10 knots over VREF?

The correct choice indicates that for every 10 knots increase over VREF (Reference Landing Speed), the landing distance increases by a factor of 14%. This relationship is based on principles of aerodynamics and energy management during landing.

As the aircraft lands, the kinetic energy it has is proportional to the square of its speed. Therefore, a small increase in speed results in a proportionally larger increase in the distance required to stop. Specifically, for every 10 knots increase, the landing distance increases significantly.

In this case, a 14% increase in landing distance is a standard figure derived from empirical data and calculations used in aviation safety and performance assessments. Such information is crucial for pilots to make informed decisions regarding landing techniques, runway length requirements, and safety margins, especially when considering factors like wind conditions or aircraft loading that may necessitate adjustments to approach speeds.

The other options reflect alternative percentages which do not accurately represent the widely accepted figure for the increase in landing distance related to VREF adjustments. Hence, recognizing that a 10-knot increase over VREF specifically correlates to a 14% increase in landing distance is crucial for effective and safe flight operations.