1. 8536. Who has the authority to approve for return to ser vice a propeller after a 100-hour inspection? 1. A mechanic with a powerplant rating. 2. Any certificated repairman. 3. A non-certificated mechanic working under the supervi sion of a certificated mechanic with airframe and pow erplant ratings. A. 1 B. 2 C. 1 and 3.