RTO

A rejected takeoff occurs when a pilot deliberately aborts the takeoff run after the aircraft has begun rolling down the runway but before rotation (the nose-up pitch that precedes flight). The decision to reject must come early enough that the aircraft can safely decelerate and stop within the remaining runway length. RTOs are emergency procedures, initiated when something goes wrong: an engine failure, instrument malfunction, warning light, loss of control responsiveness, or any condition that makes flight unsafe. The crew is trained to make the abort decision quickly and decisively, using maximum available braking and, on larger aircraft, thrust reversers.

The pilot's decision point is called V1, the go/no-go speed. Below V1, an RTO is always safer than attempting flight with a problem. Above V1, the aircraft is considered committed to flight because stopping distance becomes marginal or impossible. The exact V1 speed depends on aircraft weight, runway length, runway surface condition, and atmospheric temperature. Heavier aircraft, shorter runways, and hot days all move V1 lower, compressing the window in which an RTO is viable. On a 10,000-foot runway, a modern jet might have V1 around 130 knots; on a 5,000-foot runway at high temperature and weight, it might be 95 knots.

Wear, damage, and recertification

An RTO is violent. Brakes absorb enormous kinetic energy in seconds. A 150-ton aircraft rolling at 130 knots carries roughly 30 megajoules of energy; it must be dissipated as heat in the wheel and brake assemblies. Brake temperatures routinely spike above 1000 degrees Fahrenheit. Tires experience extreme sidewall stress and can fail or even catch fire if the abort is violent enough. Runway surface damage and hydroplaning risk increase in wet conditions. After an RTO, the aircraft goes into a mandatory maintenance inspection: brake system, tire condition, landing gear structure, flight control linkages, and engine condition must all be checked before the next flight. Many RTOs result in brake overhaul or tire replacement.

RTOs remain rare in commercial aviation because pre-flight checks and continuous monitoring catch most problems before takeoff. Modern aircraft systems also detect anomalies and alert crews early in the takeoff roll. However, the possibility of sudden engine failure or structural damage remains, and crews train regularly for rejected takeoffs in full-motion simulators. A successful RTO requires clear communication between pilot flying and pilot monitoring, immediate selection of maximum reverse thrust and wheel brakes, and steady directional control. The term has been standard in aviation operations and maintenance since the jet age.