Abnormal maneuver includes abrupt, evasive maneuvers.

Occurrences involving collisions/near collisions with bird(s).

Collision with obstacle(s) during takeoff or landing while airborne.

Occurrences during or as a result of external load or external cargo operations.

Fire or smoke in or on the aircraft, in flight, or on the ground, which is the result of impact.

Fire/Smoke resulting from impact.

One or more powerplants experienced reduced or no power output due to fuel exhaustion, fuel starvation / mismanagement, fuel contamination / wrong fuel, or carburetor and/or induction icing.

Collision while taxiing to or from a runway in use.

Occurrences during (or as a result of) ground handling operations.

Accumulation of snow, ice, freezing rain, or frost on aircraft surfaces that adversely affects aircraft control or performance.

Loss of aircraft control while the aircraft is on the ground.

Loss of aircraft control while, or deviation from intended flightpath, in flight.

Loss of control inflight is an extreme manifestation of a deviation from intended flightpath. The phrase "loss of control" may cover only some of the cases during which an unintended deviation occurred.

Collision or near collision with obstacles / objects / terrain while intentionally operating near the surface (excludes takeoff or landing phases).

Occurrences involving illnesses of persons on board an aircraft.

Air proximity issues, Traffic Collision Avoidance System (TCAS)/Airborne Collision Avoidance System (ACAS) alerts, loss of separation as well as near collisions or collisions between aircraft in flight.

Failure or malfunction of an aircraft system or component other than the powerplant

Failure or malfunction of an aircraft system or component related to the powerplant.

Unintended flight in Instrument Meteorological Conditions (IMC).

Flight into wind shear or thunderstorm.

Use of aircraft to enhance food, fiber and bio-fuel production, protect forestry and control health-threatening pests.

Use of aircraft to observe fish/game, law enforcement, photography/filming, property, traffic, other.

Provide the public with aerial access to scenic areas.  Air Tour is normally operated under Part 135 or 136 and Sightseeing is under Part 91.

Business is the use of aircraft for a single company's use such as corporate travel.

Commercial is the use of aircraft for profit using a Part 135 operating certificate.

The use of aircraft to gather news, traffic or other noteworthy information. May also be used as a pooled resource.

The use of helicopters to provide a means of transporting equipment outside of the aircraft via a cable/line or other device.

The use of helicopters to provide a means of transporting equipment and personnel supporting firefighting operations.

The use of helicopters to provide a means of transporting people in urgent need of medical assistance.  (Patient or medical team transport or positioning, interfacility and scene flights).

The use of helicopters to provide flight instruction (basic and advanced).

The use of helicopters to provide a means of transporting personnel and equipment during law enforcement operations.

The use of helicopters to provide a means of transporting personnel and equipment during forestry operations.

The use of helicopter transportation services to the offshore oil, gas and onshore mining industries.

The use of helicopters for personal/private use.

The use of helicopters to provide a means of transporting personnel and equipment during patrol and construction operations for both power and pipeline systems.