Which inspections can a certificated airframe and powerplant mechanic approve for return to service?

A certificated airframe and powerplant (A&P) mechanic has the authority to approve an aircraft for return to service after certain types of inspections. Among these, the 100-hour inspection and progressive inspection are both authorized for approval.

The 100-hour inspection is required for aircraft that are used for hire or for flight instruction, and a certificated A&P mechanic can perform this inspection and subsequently approve the aircraft for return to service after ensuring that it meets all necessary conditions. Similarly, progressive inspections, which are a more flexible approach allowing for periodic checks rather than a full annual inspection, can also be approved for return to service by a licensed A&P mechanic who has performed the required checks.

While annual inspections are typically performed by A&P mechanics, the distinction with progressive inspections lies in their method and scheduling, which provides more operational flexibility for the aircraft's maintenance program. Therefore, the ability to approve both 100-hour and progressive inspections aligns with the regulatory authority assigned to a certificated A&P mechanic, emphasizing their role in maintaining aircraft safety and compliance.

In contrast, the other options restrict the range of inspections that can be approved, which does not accurately reflect the full scope of an A&P mechanic's authority.