Which of the following is an indicator of a Class B mishap?

A Class B mishap is characterized by specific criteria related to the severity of injuries and the extent of property damage. The correct indicator of a Class B mishap is the hospitalization of three or more personnel. This definition aligns with established aviation safety classifications, where the number of individuals hospitalized following an incident reflects a significant level of injury severity that warrants classification as a Class B incident.

In this context, if three or more personnel require hospitalization, it indicates serious injuries that exceed the limitations set for less severe classifications, demonstrating a substantial impact on health and safety. This aligns with the criteria used in mishap reporting and classification systems, ensuring that patterns of injury severity are effectively tracked for safety improvement.

The other scenarios presented do not meet the specific thresholds to qualify as a Class B mishap. Property damage thresholds and types of injuries leading to injury classifications are more specifically defined, showing that such classifications are crucial to accurately assess and report aviation safety incidents.