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extremeactiontonarrowlyavoidacollision, or the event results in a collision.  A  Aseriousincidentinwhichacollisionwasnarrowly avoided. 
B  Separation decreases and there is a significant potential for a collision.  B  An incident in which separation decreases and there is a significant potential for collision, which may result in a time critical corrective/ evasive response to avoid a collision. 
C  Separation decreases, but there is ample time and distance to avoid a potential collision.  C  An incident characterized by ample time and/or distance to avoid a collision. 
D  Little or no chance of a collision but meets the definition of a runway incursion. 
Other Surface Incidents  An event during which unauthorized or unapproved movement occurs within the movement area or an occurrence in the movement area associated with the operationofanaircraftthataffectsorcould affect the safety of flight.  (This subset  D  Incident that meets the definition of runway incursion such as incorrect presence of a single vehicle/person/aircraft on the protected area of a surface designated for the landing and takeoff of aircraft but with no immediate safety consequences. 
includes only non-conflict events.)  Not Defined  (FAAnon-conflictsurfaceincidentsincludemore than just ICAO class “D” events.) 
ID  InsufficientData:inconclusiveorconflicting evidence precludes severity assessment.  E  Insufficientinformationinconclusiveorconflicting evidence precludes severity assessment. 

Prior to the adoption of the ICAO definition, the FAA reviewed all surface incidents, identified a subset as runway incursions, and assigned a severity. Effective FY 2008 the FAA began categorizing runway incursions using the ICAO definition of incursions and the ICAO severity categories. Figure D2 shows a comparison of the number of runway incursions after the FAA adopted the new reporting standard in October 2007.

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