What is the minimum taxi speed while on a wet runway?

The minimum taxi speed on a wet runway is established primarily to ensure safe handling characteristics and to mitigate the risk of hydroplaning. A speed of 10 knots allows for adequate control of the aircraft while ensuring that the wheels maintain enough contact with the runway surface, which is crucial when the surface is slippery from rain or other moisture.

When taxiing at higher speeds, there is an increased risk of losing directional control, especially if water is pooled on the runway. The choice of 10 knots strikes a balance that allows the aircraft to safely navigate without the risk associated with faster taxi speeds on a wet surface, which could compromise braking effectiveness and steering control.

Options suggesting lower speeds, such as 5 knots, do not account for the necessity of maintaining momentum and control while navigating the potential hazards of a wet runway surface. Conversely, higher speeds, such as 15 knots or 20 knots, would increase the risk of hydroplaning and reduce the pilot's ability to react to sudden changes in control inputs. Therefore, 10 knots is the optimum speed that aligns with safety protocols for wet runway operations.