Which of the following includes all the regulatory definitions of 'maintenance'?

The correct choice encompasses the comprehensive regulatory definitions of 'maintenance' as outlined by the FAA, which includes actions taken to ensure the aircraft's safe and continued airworthiness.

Overhaul refers to the thorough examination and restoration of an aircraft component to ensure it performs effectively, while repair involves fixing any malfunctioning parts to restore their function. Parts replacement is crucial in maintaining the integrity of the aircraft, as worn or damaged parts must be substituted to uphold safety. Inspection is a proactive measure that identifies potential issues before they develop into serious problems, and preservation entails steps taken to protect components from deterioration over time. This thorough understanding aligns with the FAA's definitions and expectations for maintaining aircraft.

In contrast, the other options highlight activities that, while important within the aviation sector, do not fit the exact regulatory definition of maintenance. For example, manufacturing and assembly pertain to the initial creation and production processes rather than ongoing maintenance. Quality control procedures and certification deal with ensuring compliance and safety standards but don’t typically fall under the category of maintenance activities. Thus, these activities are distinct from the regulatory definition which emphasizes the ongoing upkeep required to ensure aircraft safety and reliability.