Runway Excursion | Flight Safety

Selected passages from the existing NFA article. This public introduction offers an operational overview; the complete study is in the member library.

An excursion is more than an overrun

An overrun carries the aircraft beyond the runway end; a veer-off takes it laterally off the runway. The former highlights distance and deceleration; the latter, directional control and traction. Both can occur during landing or takeoff. This study focuses on landing.

Speed, touchdown point, wind, surface, systems and execution can interact. The risks are not completely separate: loss of traction can compromise both braking and the ability to remain on the runway.

The runway is a finite resource

Use the published, applicable landing distance available — LDA — including relevant restrictions and changes. Physical length, the visual impression of the runway and usable distance are not necessarily the same. A displaced threshold or temporary reduction can change the assessment.

After touchdown, the remaining distance will be smaller. Every segment spent airborne or without effective deceleration reduces stopping space. This does not authorize improvising a new calculation during rollout: assumptions and criteria must be protected beforehand.

Kinetic energy: speed and reference frame matter

For the same mass, translational kinetic energy is proportional to speed squared. When discussing stopping on the runway, speed relative to the ground is the relevant reference; to meet the approach target, use the speed reference specified by procedure. Do not confuse their purposes.

As a physics illustration, 10% more groundspeed means 21% more kinetic energy for the same mass. This does not automatically mean 21% more landing distance: deceleration forces, wind, surface and technique vary. Obtain distance through the approved method, never through this ratio.

The approach is the first barrier

Energy management, stabilized approach, go-around decision and excursion prevention belong to the same chain. Anticipation reduces corrections; stabilization makes arrival predictable; applying continuation criteria prevents an unsuitable condition from being transferred to the ground.

A favorable trend does not waive a mandatory criterion. If the gate requires a condition that has not been achieved, execute the prescribed action. A long or visible runway creates no exception.

Instability can move into another phase

An aircraft that is high and fast may approach its target without restoring the full margin. If it crosses the threshold outside the assumptions, floats and lands beyond the intended point, it starts decelerating with less runway and a condition different from the plan.

The fact that a correction produced a touchdown does not demonstrate that continuation was appropriate. In debriefing, assess criteria and assumptions as well as the outcome. An uneventful landing can conceal depleted barriers.

OPERATIONAL DOCUMENTATION TAKES PRECEDENCE

Educational material. Current aircraft and operator manuals, SOPs, mandatory criteria and required actions take precedence. These passages do not introduce new procedures or authorize exceptions.

Technical sources from the original article

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