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

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

• A. The aircraft owner
• B. A mechanic with a powerplant rating
• C. Any certificated repairman
• D. A non-certificated mechanic under supervision

Answer: (B)

The main idea being tested is who is authorized to sign off and release an aircraft for flight after a 100-hour inspection. After this mandated check, the release to return to service must be given by a certificated mechanic who has the appropriate rating for the work—specifically, a powerplant rating. This rating covers the engine and related systems, including the propeller, so the mechanic has the documented authority and technical capability to judge that the aircraft is airworthy and safe to fly again. In practice, that means the person who performed the 100-hour inspection (or another certificated mechanic with the powerplant rating) can endorse the aircraft for return to service on the maintenance log. The aircraft owner, a non-certificated individual, or someone lacking the proper rating does not have the authority to approve return to service after this inspection. A certificated repairman without the appropriate rating also wouldn’t be authorized to issue the release for flight.

The main idea being tested is who is authorized to sign off and release an aircraft for flight after a 100-hour inspection. After this mandated check, the release to return to service must be given by a certificated mechanic who has the appropriate rating for the work—specifically, a powerplant rating. This rating covers the engine and related systems, including the propeller, so the mechanic has the documented authority and technical capability to judge that the aircraft is airworthy and safe to fly again.

In practice, that means the person who performed the 100-hour inspection (or another certificated mechanic with the powerplant rating) can endorse the aircraft for return to service on the maintenance log. The aircraft owner, a non-certificated individual, or someone lacking the proper rating does not have the authority to approve return to service after this inspection. A certificated repairman without the appropriate rating also wouldn’t be authorized to issue the release for flight.