Actually the definition is
HERE
Here are some relevant excerpts...emphasis added by me:
Aircraft accident means an occurrence associated with the operation
of an aircraft which takes place between the time any person boards the
aircraft with the intention of flight and all such persons have
disembarked, and in which any person suffers death or serious injury, or
in which the aircraft receives substantial damage.
Substantial damage means damage or failure which adversely affects the structural strength, performance, or flight characteristics of the aircraft, and which would normally require major repair or replacement of the affected component.
One would think the "flight characteristics" of the aircraft in the picture were "adversely affected".
Just for clarification however:
Engine failure..................not considered substantial damage'' for the purpose of this part.