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Category A (FY 2007 and prior) — Separation decreases and participants take extreme action to narrowly avoid a collision, or the event results in a collision.
Category A (Beginning FY 2008) — A serious incident in which a collision was narrowly avoided.
Category B (FY 2007 and prior) — Separation decreases and there is a significant potential for collision.
Category B (Beginning FY 2008) — 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.
Category C (FY 2007 and prior) — Separation decreases, but there is ample time and distance to avoid a potential collision.
Category C (Beginning FY 2008) — An incident characterized by ample time and/or distance to avoid a collision.
Category D (FY 2007 and prior) — Little or no chance of collision, but meets the definition of a runway incursion.
Category D (Beginning FY 2008) — 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.
Commercial Aviation Operations — Scheduled or charter-for-hire aircraft used to carry passengers or cargo.  Airlines, air cargo and charter services typically operate these aircraft. This group of aircraft operations includes jet transports and commuter aircraft.
Crew Resource Management (CRM) — The optimal use of all available resources, information, equipment and people to achieve safe and efficient flight operations.
Engineered Materials Arresting System (EMAS) — An EMAS uses materials of closely controlled strength and density placed at the end of a runway to stop or greatly slow an aircraft that overruns the runway. The best material found to date is a lightweight, crushable concrete. When an aircraft rolls into an EMAS arrestor bed the tires of the aircraft sink into the lightweight concrete and the aircraft is decelerated by having to roll through the material.
General Aviation (GA) — GA operations encompass the full range of activity from student pilots to multi-hour, multi-rated pilots flying sophisticated aircraft for business or pleasure. This group of aircraft operations includes small GA aircraft (less than 12,500 lbs maximum takeoff weight) and large general aviation aircraft (maximum takeoff weight greater than or equal to 12,500 lbs.) The small GA aircraft tend to be single-piloted aircraft, such as a Cessna 152 or Piper Cherokee. Corporate or executive aircraft with a two-person flight crew, for example a Cessna Citation C550 or a Gulfstream V, represent the large GA aircraft.
Hold Short — An air traffic control instruction to the pilot or an aircraft or a vehicle driver not to proceed beyond a specified point.
Hot Spot — A location on an aerodrome movement area with a history or potential risk of collision or runway incursion where pilot/vehicle operator heightened attention is necessary.
　
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本文鏈接地址：National Runway Safety Plan 2009-2011(24)