A certificated mechanic with airframe and powerplant ratings may:

A certificated mechanic with airframe and powerplant ratings is authorized to conduct 100-hour inspections on aircraft. These inspections are critical for ensuring the safety and airworthiness of the aircraft, especially for those used in on-demand operations or commercial purposes where such inspections are required more frequently than annual inspections.

The specific training and certification that a mechanic receives equip them with the necessary knowledge and skills to perform thorough inspections, identify potential issues, and ensure compliance with Federal Aviation Administration (FAA) regulations. This role is crucial for maintaining flight safety and operational efficiency.

In contrast, while a mechanic may have the expertise to perform repairs or modifications on certain components, such as instruments or navigation systems, these actions typically require additional authorization or training beyond the basic mechanic certification. Moreover, supervising other mechanics can be part of their role if they have the requisite experience and training, but it's not a primary function tied specifically to their certification.