If an aircraft is unairworthy due to major repairs, who is responsible for approving it for return to service?

The correct answer emphasizes the requirement for specialized oversight in the return-to-service process after significant repairs are made to an aircraft. Specifically, an appropriately rated mechanic, who holds the relevant certifications for the particular type of work done, alongside an Inspection Authorization (IA), is necessary to ensure that the aircraft meets all safety and regulatory standards before it can be deemed airworthy again.

This reflects the regulatory framework established by aviation authorities that dictate rigorous standards for maintenance and repair activities. An IA is a mechanic with additional qualifications that allow them to perform inspections on major repairs and alterations. Their involvement ensures that all appropriate checks and balances are maintained, thereby reinforcing the safety standards for aircraft operations.

The other roles mentioned, such as a flight instructor or a repair station administrator, do not possess the necessary qualifications to approve an aircraft for return to service after major repairs. A flight instructor primarily focuses on pilot training and does not have the authority to assess the mechanical integrity of an aircraft post-repair. Similarly, a repair station administrator may oversee operations but lacks the specific certification required for the inspection process following significant repairs. Hence, the involvement of both a rated mechanic and an IA is essential to guarantee compliance with regulatory requirements and ensure the safety of the aircraft.