Who is responsible for maintenance and alterations of an aircraft under 14 CFR Part 125?

The responsibility for maintenance and alterations of an aircraft under 14 CFR Part 125 lies with the holder of the Part 125 certificate. This regulation outlines that the certificate holder is ultimately accountable for ensuring that all required maintenance is performed in accordance with the applicable standards and regulations.

The Part 125 certificate indicates that the entity operates large aircraft for hire or compensation, and it places a legal obligation on them to maintain their aircraft in a condition that ensures safety and compliance with all relevant FAA regulations. This includes proper documentation, adherence to maintenance schedules, and ensuring that all alterations are carried out by qualified personnel.

While other involved parties, such as the registered owner or the maintenance shop, may also have roles in the process, they do not hold the same level of responsibility as the certificate holder, who is directly governed by the regulations set forth in Part 125. The FAA inspector also plays a significant role in oversight and compliance, but they do not bear the responsibility for the actual maintenance and alterations. This structure ensures accountability within the aviation industry and promotes safety in operations.