How much does a wet runway increase aircraft landing distance?

Under standard dispatch rules, a smooth wet runway requires at least a 35% to 40% increase over unfactored dry landing distance (multiplier of ~1.35x to 1.40x), plus a mandatory 15% operational safety margin.

What is dynamic hydroplaning and when does it occur?

Dynamic hydroplaning occurs when standing water (depth > 3mm) builds a wedge in front of the tire, lifting it completely off the pavement. The minimum dynamic hydroplaning speed in knots is roughly calculated as 9 times the square root of the tire pressure in PSI (9 × √PSI).

FAA TALPA / RCAM Surface Matrix

Contaminated Runway Landing Distance Calculator

Calculate landing rollout distances on contaminated surfaces. Select FAA Runway Condition Codes (RWYCC 1–6) for rain, slush, snow, and ice, including 15% safety dispatch factors.

FAA TALPA / RCAM Runway Surface Condition

POH Unfactored Dry Landing Distance (Feet)

Reported Runway Condition Code (RWYCC)

Thrust Reversers Inoperative (MEL dispatch penalty)

Total Required Runway Length (With 15% Buffer)

3,416 ft

Factored ground roll: 2,970 ft (Multiplier: 1.35x) + 446 ft FAA safety buffer.

Reported Braking Action:Good

Hydroplaning Hazard: LowWet runway requires at least 35% increased landing distance over dry unfactored distance.

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Everything you need to know about cash runway, burn rates, and financial planning.

The FAA Takeoff and Landing Performance Assessment (TALPA) initiative introduced the Runway Condition Assessment Matrix (RCAM). It replaces subjective pilot braking action reports with objective Runway Condition Codes (RWYCC from 0 to 6) based on contaminant type, depth, and temperature.