Which statement is true?

• A. The SIB's final output is the final message
• B. An ISB is an investigation
• C. The ISB's never produce a briefing to the CA
• D. MAJCOM is not the convening authority

Answer: (A)

In mishap investigations, the formal end product and who convenes the inquiry define what is true about the process. The Safety Investigation Board produces a final message as its official culmination—the authoritative communication that conveys the investigation’s conclusions and required actions. This final message wraps up the investigation and is the document sent to the convening authority and other stakeholders to close the case. It’s the definitive end product of the SIB’s work, not a separate interim or secondary document.

The other statements don’t fit because the ISB is a board that conducts the investigation rather than the investigation itself, and ISBs do brief the convening authority as part of the process. Additionally, the convening authority is typically the MAJCOM in many scenarios, so saying MAJCOM is not the convening authority is generally not correct.