Which document should reflect the date of the most recent transponder inspection?

• A. Aircraft maintenance records
• B. Pilot logbook
• C. Airworthiness certificate
• D. Manufacturer's service bulletin

Answer: (A)

Maintenance history for an aircraft is kept in the aircraft maintenance records, and this is where you document when inspections and servicing are completed. The date of the most recent transponder inspection must be recorded there so authorities and mechanics can verify compliance with the inspection interval.

The pilot’s logbook is for recording flight time and currency, not for tracking equipment inspections. The airworthiness certificate shows that the aircraft is airworthy, but it does not list inspection dates or maintenance history. A manufacturer’s service bulletin provides guidance or recommendations, not a record that an actual inspection has taken place on a specific aircraft.