Which factors affect landing distance and how can braking performance be optimized on a wet runway?

• A. Weight, speed, configuration, wind, and runway conditions affect landing distance; optimize with correct approach speed, configuration, and use of autobrakes and thrust reversers per procedure.
• B. Weight has no effect on landing distance.
• C. Braking performance on wet runway is independent of configuration.
• D. Autobrakes should never be used on wet runways.

Answer: (D)

Landing distance is governed by the aircraft’s kinetic energy that must be dissipated during deceleration, so weight, touchdown speed, flap/gear configuration, wind, and runway conditions all influence how far you must travel to stop. On a wet runway, the friction between tires and the surface is reduced, and any contamination (water, oil, or rubber deposits) lowers braking effectiveness, which tends to increase stopping distance.

To optimize braking on a wet runway, start with a stable, properly controlled approach at the correct speed. Choose a landing configuration that provides enough drag to help you fly at the required approach speed without floating, then touch down in the intended zone so you can load the wheels early and maximize braking leverage. After touchdown, deploy the spoilers to unload lift, which increases the weight on the tires and improves braking response. Use the braking system as per SOP: engage autobrakes at the appropriate setting and apply wheel braking smoothly with anti-skid in effect to modulate pressure and prevent tire lock. Thrust reversers should be used as outlined in procedures to assist deceleration, especially early in the rollout when friction is low. Avoid abrupt, heavy pedal input that can lead to hydroplaning or loss of directional control; instead, mix braking with reverse thrust and spoilers to achieve a controlled, continuous deceleration.

Autobrakes are not something to avoid on wet surfaces; they’re designed to provide consistent braking and reduce pilot workload under reduced friction conditions. The key is following the approved procedure for braking on a wet runway and using all available deceleration tools in harmony to achieve the required stopping distance.