Events deleting sections

These failures can be divided into failures based on events and time intervals. Events are classified as graphical and operational events. Graphical events are entry, deletion, movement or format modification of an entity at the display. Operational events are not associated with the display (for example blocking a track section, locking the doors). 

Individual sections have been prepared on aircraft crashes (with a strong emphasis on fuel effects), external fires, explosions, drifting gas clouds, releases of corrosive fluids, collisions with water intakes and all remaining external natural events. The discussion on each of these topics has been expanded and updated. Some material that appeared in the previous Safety Guides on these topics has been deleted. 

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