Who has the authority to approve a propeller for return to service after a 100-hour inspection?

The authority to approve a propeller for return to service after a 100-hour inspection rests with a mechanic who holds a powerplant rating. This is because a powerplant-rated mechanic is specifically trained and qualified to inspect and approve engine and propeller components. The knowledge and skills gained through the powerplant rating ensure that the mechanic can adequately assess the condition and functionality of the propeller.

Regulatory structures, such as those set by the Federal Aviation Administration (FAA), dictate that only those with the appropriate certifications and ratings are authorized to perform certain tasks, ensuring that safety standards are met. Therefore, the specific focus on the requirements of the inspection reflects the recognized need for specialized training in mechanical systems related to aircraft propulsion.