Definition
A loss of tire-to-runway friction that occurs when a locked or skidding tire generates enough heat to boil the water trapped beneath it, producing steam that softens and reverts the tire rubber to an uncured state. The reverted rubber forms a seal around a small pocket of steam, lifting the tire off the runway and dramatically reducing braking effectiveness, often leaving a distinctive white steam-cleaned streak on the pavement.
Plain English
When a tire skids on a wet runway, the friction can heat the water under it into steam. The steam softens the rubber and traps a pocket of vapor that lifts the tire off the surface, so the brakes stop working effectively even at low speeds.
Context Anchor
Encountered in landing, rejected takeoff, and braking discussions for wet or contaminated runways.
Derivation
‘Reverted’ comes from the Latin revertere, meaning ‘to turn back.’ Here, the cured rubber of the tire is heated until it ‘turns back’ toward its original uncured, gummy state. ‘Hydroplaning’ combines the Greek hydro- (water) with ‘planing,’ meaning to glide along a surface — so the tire is gliding on water rather than gripping the runway.
Why Pilots Care
It removes all wheel braking and steering, often during high-speed landings or aborted takeoffs on wet pavement, and can lead to runway excursions if not anticipated.
Analogy
Think of the tire turning into a miniature water ski: once the rubber softens and seals the water film, the wheel rides on that film instead of the pavement.
Grounding Statement
Picture a locked tire sliding on a wet runway with a thin cushion of steam and softened rubber under it instead of the tire firmly gripping the pavement.
Intuition Check
Do not read reverted as meaning the tire returns to normal. Here it means the tire rubber has been changed by heat into a softened condition that helps the skid continue.
Example Sentence 1
After the long skid on the wet runway, the white streak on the pavement showed that reverted rubber hydroplaning had occurred.
Example Sentence 2
After landing in heavy rain, the crew recognized the onset of reverted rubber hydroplaning when brake pressure produced no change in groundspeed.