At what AIS level is a "serious injury" classified that requires an accident report?

A "serious injury" is classified at Level 3 according to the Aeronautical Information System (AIS). A serious injury is defined as one that requires hospitalization for more than 48 hours, any injury that results in a fracture of any bone (except for simple fractures of the fingers, toes, or nose), or any injury that involves significant loss of blood, or damage to internal organs. These criteria clearly outline the severity of the injuries that necessitate a formal accident report.

The different levels of injury classifications in the AIS system help authorities assess the seriousness of air accidents and ensure that appropriate reports are filed to maintain safety standards and track aviation safety.