Who can correct discrepancies found on an aircraft that is not approved for return to service?

An appropriately rated mechanic has the qualifications necessary to identify and rectify discrepancies on an aircraft that is not approved for return to service. This means that they possess the knowledge and skills required to address issues with the aircraft safely and in accordance with regulatory standards.

Mechanics who hold the appropriate certifications have undergone training and have demonstrated their understanding of aircraft systems and maintenance practices. They are equipped to perform necessary repairs and ensure that discrepancies are resolved to maintain the safety and airworthiness of the aircraft.

Other options may involve individuals who either lack the necessary certifications to perform such repairs or are limited to specific functions that do not include addressing all discrepancies. For example, a mechanic with an inspection authorization may perform higher levels of inspections but might not necessarily be the one to carry out repairs unless they also hold a mechanic's certification in relevant areas. Similarly, while any certificated repair station is authorized to perform maintenance, the question specifically asks about who can correct discrepancies, which aligns directly with the capabilities of an appropriately rated mechanic.