What types of incidents require a formal investigation?

Answer: B — Accidents and major equipment failures

A formal investigation is essential for accidents and major equipment failures because these incidents can have significant safety, operational, and financial implications. When an accident occurs, it is crucial to thoroughly assess the causes and conditions surrounding it to prevent future occurrences and ensure the safety of employees and passengers. This involves collecting data, interviewing witnesses, reviewing equipment performance, and analyzing adherence to safety protocols. For major equipment failures, a detailed investigation is similarly vital, as it helps identify whether the failure was due to maintenance issues, operational oversight, design flaws, or other factors. Understanding these elements is key to improving equipment reliability and enhancing safety protocols. In comparison, minor delays, routine maintenance, and weather-related disruptions typically do not warrant the same level of scrutiny, as they are often considered part of regular operational challenges. While all incidents should be reported and monitored, the requirement for a formal investigation is specifically linked to the severity and potential consequences associated with accidents and major equipment failures.