In the context of 2026 aviation and technical maintenance, the four primary types of inspections are known as A, B, C, and D checks. An A Check is a routine inspection performed roughly every 400–600 flight hours, focusing on light maintenance and fluid levels. A B Check is a more detailed inspection occurring every 6–8 months, often including systems testing. The C Check is a "heavy maintenance" event every 2 years where the aircraft is largely stripped for a deep structural and component audit. Finally, the D Check (the "Heavy Maintenance Visit") happens every 6–10 years and involves completely dismantling the plane to inspect the metal for fatigue and corrosion. In 2026, these are increasingly supplemented by "Predictive AI Inspections" that monitor real-time sensor data, but these four manual checks remain the legal regulatory standard for ensuring global flight safety.