A certificated powerplant mechanic is authorized to perform which action?

A certificated powerplant mechanic has specific authorizations primarily focused on the maintenance, repair, or alteration of engine and propeller systems. Making minor repairs on a propeller falls within the scope of work that a powerplant mechanic is typically authorized to perform, as it aligns with their training and certification, which emphasizes the mechanical aspects of aircraft systems, particularly engines and propellers.

In contrast, completing a 100-hour inspection is generally a task that requires additional authority, often necessitating the involvement of a mechanic with airframe certification as well. Performing major repairs on airframes also exceeds the scope of a powerplant mechanic's certification, as these tasks specifically relate to the structural aspects of the aircraft rather than the engine systems. Additionally, issuing Airworthiness Certificates is solely within the purview of authorized personnel such as Designated Pilot Examiners or other designated officials—not powerplant mechanics.

By understanding the role and limitations of a certificated powerplant mechanic, it becomes clear why making a minor repair on a propeller is the appropriate choice.