Under Progressive Inspection, how often must the entire aircraft be inspected?

• A. Every 6 months
• B. Every 24 months
• C. Only during annual inspections
• D. Every 12 calendar months

Answer: (D)

Progressive Inspection spreads the annual inspection into a year-long cycle, with portions of the airframe, engine, and systems inspected at scheduled intervals by a designated inspector. The key timing is that the full, complete inspection must be accomplished within a 12-calendar-month period. By the end of that year, the aircraft has received the equivalent of an annual inspection, so downtime is minimized while maintaining airworthiness. This differs from a strict 6-month or 24-month schedule, and it isn’t only done during a separate annual event—the inspections are distributed across the year under supervision.