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In the SINTEF helicopter studies (Herrera et al. 2010), helicopter accidents are classified into eight categories:

1 (1)Accident during takeoff or landing on a heliport

2 (2)Accident during takeoff or landing on a helideck (i.e. on an offshore platform)

3 (3)Accident caused by critical aircraft failure during flight

4 (4)Midair collision with another aircraft

5 (5)Collision with terrain, sea, or a building structure

6 (6)Personnel accident inside a helicopter (i.e. caused by toxic gases due to fire or cargo)

7 (7)Personnel accident outside a helicopter (i.e. hit by tail rotor)

8 (8)Other accidents.

The studies are limited to accidents involving helicopter crew and passengers. Accidents involving other persons and other assets are not included.