Which statement correctly compares an annual inspection and a 100-hour inspection?

Which statement correctly compares an annual inspection and a 100-hour inspection?

• A. An annual inspection is required every 12 calendar months for most certificated aircraft; a 100-hour inspection is required for aircraft used for hire or flight instruction and must be performed at 100-hour intervals
• B. An annual inspection is required every 6 calendar months; a 100-hour is required for all aircraft every year
• C. An annual inspection is optional; a 100-hour is required only when malfunction occurs
• D. An annual inspection replaces a 100-hour inspection if the aircraft is not used for hire

Answer: (A)

Annual inspections and 100-hour inspections are driven by different criteria, so they serve different maintenance needs. The annual inspection is a calendar-based requirement: every 12 calendar months, a comprehensive airworthiness check must be performed for most certificated aircraft. The 100-hour inspection is time-in-service based and applies to aircraft used for hire or flight instruction, requiring inspection at every 100 hours of flight time. These inspections are separate obligations; one does not replace the other. They can occur in the same period, but both must be satisfied when applicable.

Annual inspections and 100-hour inspections are driven by different criteria, so they serve different maintenance needs. The annual inspection is a calendar-based requirement: every 12 calendar months, a comprehensive airworthiness check must be performed for most certificated aircraft. The 100-hour inspection is time-in-service based and applies to aircraft used for hire or flight instruction, requiring inspection at every 100 hours of flight time. These inspections are separate obligations; one does not replace the other. They can occur in the same period, but both must be satisfied when applicable.