Runway Incursion

Definition

A runway incursion is any unauthorized presence of an aircraft, vehicle, person, or object on a runway that compromises or has the potential to compromise safety. ICAO defines it as:
“Any occurrence at an aerodrome involving the incorrect presence of an aircraft, vehicle or person on the protected area of a surface designated for the landing and take-off of aircraft.”

Runway incursions are considered serious safety incidents and are a leading cause of aviation accidents and near misses on the ground.

Types of Runway Incursions

Category	Description
Pilot deviation	Aircraft enters/crosses runway without ATC clearance
ATC error	ATC gives conflicting or incorrect instructions
Vehicle deviation	Ground vehicle enters runway unauthorized
Pedestrian deviation	Person enters active runway area

Common Causes

Misunderstood or incorrect readbacks
Failure to comply with hold short instructions
Distraction during taxi or in low visibility
Lack of situational awareness
Poor ground signage or lighting
Fatigue, language barriers, or training gaps

Examples of Runway Incursions

Aircraft crosses a runway during another aircraft’s landing roll
Vehicle enters runway to inspect lights without tower clearance
Pilot lines up without receiving takeoff clearance
Ground crew walks across runway during active operations

Phraseology That Helps Prevent Incursions

Situation	Phraseology
Holding short	“Hold short runway 27” – must be read back exactly
Lining up	“Line up and wait runway 09” – does not mean take off
Crossing	“Cross runway 08, report vacated” – only proceed when clear
Uncertainty	“Confirm cleared to cross runway 34?” – always ask if unsure

ATC Tools to Prevent Incursions

Stop bars: Red in-ground lights at holding points
Runway status lights: Automated warning systems
Ground radar (SMR): Detects unauthorized movements
Standardized phraseology: Reduces misunderstanding

Pilot Best Practices

✅ Brief the taxi route before taxiing
✅ Verify clearances and runway identifiers visually
✅ Use progressive taxi instructions if confused
✅ Maintain high vigilance in low visibility
✅ Repeat critical instructions verbatim
✅ Turn on transponder with Mode C or S while taxiing

Reporting and Consequences

All runway incursions are reportable events and may trigger safety investigations.
Penalties can range from retraining to license action, depending on severity.
Reporting systems (e.g., ASRS, ECCAIRS) encourage pilots to self-report for safety analysis.

Remember

“No aircraft, vehicle, or person shall enter a runway without a valid ATC clearance.”