According to Part 43 of the Federal Aviation Regulations, who is not authorized to perform maintenance?

The correct answer focuses on the specific authorization granted to individuals under various certification categories outlined in the Federal Aviation Regulations. In this case, the holder of a manufacturer certificate is not explicitly authorized to perform maintenance unless they also hold a separate repairman or mechanic certificate.

Manufacturers are primarily responsible for the production and design of aircraft and parts, which does not automatically grant them the authority to conduct maintenance activities. Maintenance work requires specific knowledge and skills that are typically certified through mechanic or repairman certificates, indicating that an individual has met the established qualifications and training requirements within the aviation maintenance industry.

In contrast, the other options involve individuals or entities specifically authorized to perform maintenance under regulatory guidelines. Repairman certificates allow holders to perform maintenance duties associated with their specialty area, while repair station certificates indicate that the facility is certified to perform maintenance, and individuals working under the supervision of a mechanic or repairman certificate are also permitted to carry out certain maintenance tasks as defined by their supervisory structure.