Which of the following is NOT authorized for someone working under a certificated mechanic?

The statement that performing a 100-hour inspection is not authorized for someone working under a certificated mechanic is accurate because a 100-hour inspection is categorized as a major maintenance task. Regulatory standards dictate that only certified mechanics can perform such inspections, as they require extensive knowledge and expertise to ensure compliance with safety and performance standards.

On the other hand, assisting in major repairs, conducting routine maintenance, and making minor repairs under supervision are actions that typically fall within the scope of tasks that a trained individual can perform as long as they are properly guided by and working alongside a certificated mechanic. This collaborative approach allows for practical training while ensuring that all necessary regulatory conditions are met during maintenance tasks.