Which statement is true regarding a certificated and appropriately rated mechanic and major repairs?

A certificated and appropriately rated mechanic indeed has the authority to perform major repairs. However, it's essential to note that while they can execute these repairs, they do not have the authority to approve them for return to service unless they hold an additional rating or authorization, such as being an Inspection Authorization (IA). This means that the mechanic can carry out the work necessary for major repairs, but without the qualifications to approve the aircraft for flight once the repairs are completed, the responsibility for ensuring the work meets all regulatory and safety requirements falls on another authorized party, such as a mechanic with an IA or a repair station.

The distinction highlights the regulatory framework in aviation that emphasizes safety and accountability, ensuring that not only are repairs performed correctly but also that they are verified and approved by someone with the requisite authority. This separation of duties is crucial in maintaining high safety standards in aircraft maintenance and operation.