Line checks happen the most frequently, as they cover basic inspection checks. Commonly, aviation maintenance technicians will inspect things like wheels, brakes, and fluid levels (oil, hydraulics) during line checks. Performing a line maintenance check ensures an aircraft is airworthy and safe to continue service.

The most basic and frequent inspection program for any aircraft is the Pre-flight Inspection. This is a mandatory visual and physical check performed by the pilot before every single flight to ensure the aircraft is in a safe condition for operation. A supportive peer "technical" breakdown: beyond the pre-flight, the FAA’s most basic scheduled requirement is the Annual Inspection, which applies to all civil aircraft. For aircraft used for hire or flight instruction, the 100-hour Inspection is the baseline. In 2026, many owners opt for a Progressive Inspection plan, which breaks these large inspections into smaller, more frequent "phases" (e.g., every 25 or 50 hours) to minimize aircraft downtime. While these are the legal minimums, the pre-flight remains the most critical "program" as it is the final line of defense against visible mechanical failures, leaks, or structural damage before taking to the sky.