What are the privileges of a certified mechanic in regard to propellers?

The correct answer focuses on the specific privileges that a powerplant mechanic holds concerning propellers. A powerplant mechanic is authorized to perform minor repairs and alterations on propellers. These tasks typically include adjustments and simple maintenance that are within the scope of their training and certification.

The distinction between minor repairs and major repairs is crucial. Minor repairs might involve adjustments or the replacement of parts that do not affect the structural integrity of the propeller. In contrast, major repairs would require more in-depth work, such as rebuilding a component or resolving issues related to safety and structural performance, which exceeds the authority granted to a powerplant mechanic.

Understanding these limitations helps to ensure safety and compliance with aviation regulations, as major repairs often require additional oversight or certification, typically performed by an appropriately qualified airframe mechanic or through specialized propeller repair services.

The other choices suggest broader privileges or restrictions that do not accurately reflect the regulations governing the work of certified mechanics on propellers, thereby emphasizing the nuances in their capabilities.