The process of carefully inspecting, verifying, and structural testing members, components, and systems on aircraft to discover existing or prospective unserviceable issues. Scheduled airplane inspections refer to any preventative maintenance performed regularly by flight attendants or technicians. Anytime a piece of equipment is suspected of malfunctioning, an unscheduled aircraft check might occur. Unscheduled aviation inspection, in a nutshell, refers to any unplanned maintenance.