Definition
A runway excursion is an aviation incident in which an aircraft departs the runway surface unintentionally during the take‑off roll, landing roll, or while maneuvering on the runway. The deviation may result in the aircraft veering off to the side (runway excursion, overrun) or overrunning the end of the runway.
Overview
Runway excursions are among the most common categories of aviation accidents and are addressed extensively in safety analyses, regulatory guidance, and aircraft design standards. They can occur on both commercial and general‑aviation aircraft and may involve damage to the aircraft, injuries to occupants, and disruption of airport operations. International civil aviation authorities, such as the International Civil Aviation Organization (ICAO) and the Federal Aviation Administration (FAA), classify runway excursions under the broader heading of “runway incursion/ excursion” safety events and require reporting, investigation, and mitigation measures.
Etymology/Origin
The term combines “runway,” denoting the prepared surface for aircraft take‑off and landing, with “excursion,” a general English word meaning a departure or deviation from a set course. The phrase entered the aviation lexicon in the late 20th century as systematic safety reporting and data collection on ground‑related incidents became standardized. Its usage is documented in ICAO safety publications and FAA advisory circulars from the 1990s onward.
Characteristics
Key factors contributing to runway excursions include:
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Environmental Conditions
- Wet, icy, or contaminated runway surfaces reduce friction, increasing stopping distance.
- Strong crosswinds or tailwinds can affect directional control.
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Aircraft Performance
- Inadequate braking or thrust reversal due to system failure or improper use.
- Excessive landing speed or misjudged touchdown point.
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Human Factors
- Pilot decision‑making errors, such as late or improper application of brakes.
- Fatigue, situational awareness lapses, or misinterpretation of runway cues.
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Runway Characteristics
- Insufficient runway length relative to aircraft weight and performance.
- Poor runway surface maintenance, unevenness, or debris (FOD).
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Operational Procedures
- Non‑adherence to stabilized approach criteria.
- Ignoring or misapplying runway safety area (RSA) and runway end safety area (RESA) guidance.
Runway excursions are classified into two primary types:
- Overrun (or overrun excursion) – the aircraft passes the runway’s end.
- Veer‑off (or side‑exit excursion) – the aircraft departs the side of the runway.
The severity of an excursion is assessed based on resulting aircraft damage, injuries, and potential for secondary hazards (e.g., fuel spillage, fire).
Related Topics
- Runway incursion – unauthorized presence of aircraft, vehicles, or personnel on the runway.
- Runway safety area (RSA) – designated cleared area surrounding the runway to reduce damage in excursions.
- Runway end safety area (RESA) – buffer zone at runway ends to mitigate overrun consequences.
- Aircraft braking system – components such as wheel brakes, anti‑skid, and thrust reversers.
- Aviation safety reporting systems – e.g., the Aviation Safety Reporting System (ASRS) and ICAO’s Safety Management System (SMS).
- Human factors in aviation – study of pilot decision‑making, fatigue, and ergonomics.
Runway excursions continue to be a focus of safety improvement programs, including enhanced runway surface monitoring, updated pilot training curricula, and aircraft system upgrades aimed at reducing the likelihood and impact of such events.