After a mechanic holding an airframe and powerplant rating completes a 100 hour inspection, what action is required before the aircraft is returned to service?

• A. Make proper entries in maintenance records
• B. File Form 337
• C. Notify the FAA
• D. Return to service immediately

Answer: (A)

Documenting maintenance is the action required before returning the aircraft to service. After a 100-hour inspection is completed, the mechanic must make proper entries in the maintenance records, detailing what was done, the date, the total time in service, and the mechanic’s certificate number and signature, showing that the work was performed according to approved data. This log keeps the aircraft’s maintenance history verifiable and confirms airworthiness to the next operator. Form 337 is reserved for major repairs or alterations, not routine 100-hour inspections; notifying the FAA isn't required for a standard inspection, and the plane cannot be released until these maintenance entries are properly recorded.