Are you referring to sUAS accidents? If so then you have to read Part 830 in its entirety. Specifically 830.2, which defines the scope of that section’s applicability to sUAS operations:
Unmanned aircraft accident means an occurrence associated with the operation of any public or civil unmanned aircraft system that takes place between the time that the system is activated with the purpose of flight and the time that the system is deactivated at the conclusion of its mission, in which:
(1) Any person suffers death or serious injury; or
(2) The aircraft has a maximum gross takeoff weight of 300 pounds or greater and sustains substantial damage.