The Difference Between “Overhaul” & “Inspection?”
Inspections involve examinations or manual checks to determine the condition of an aircraft or one of its components. An inspection may include a routine visual examination up to a detailed examination involving complete disassembly or the use of X-ray, ultrasonic, eddy current, or magnetic particle equipment to determine the condition of the aircraft or component. On the other hand, an overhaul consists of disassembly, cleaning, inspection, repair, reassembly, and testing of the aircraft or the particular component.
Source: The Difference Between “Overhaul” & “Inspection?” | Midwest Flyer – General Aviation Magazine