Who is permitted to repair an aircraft instrument?

A certificated repair station approved for that class of instrument is the correct choice because such a repair station has met specific requirements set forth by the Federal Aviation Administration (FAA). These repair stations must have the necessary facilities, equipment, and personnel qualified to perform repairs on aircraft instruments according to aviation regulations. They operate under strict regulations and are regularly inspected to ensure compliance with safety standards, making their certification essential for trust in the repair quality and reliability of aircraft instruments.

In contrast, a licensed pilot with a commercial rating does not possess the authority or specialized training required for instrument repair. Similarly, a certificated repairman with an airframe rating may not have the specific qualifications needed for instrument repairs unless further certifications are obtained. An FAA flight instructor, while knowledgeable about flight operations, also lacks the necessary credentials and training to repair instruments.