Aircraft maintenance refers to the processes and procedures required to keep an aircraft in safe and efficient operating condition. This includes routine inspections, repairs, modifications, and the replacement of parts to ensure the aircraft meets regulatory standards and operates reliably. Maintenance can be categorized into several types: line maintenance, which consists of tasks performed at an airport that require minimal downtime; and heavy maintenance, which involves more extensive checks and repairs that may take place in a maintenance facility. Maintenance activities are typically guided by aviation regulatory authorities and standards, including the Federal Aviation Administration (FAA) in the United States or the European Union Aviation Safety Agency (EASA) in Europe. Proper aircraft maintenance is essential for flight safety, performance, and compliance with legal requirements, and it involves a range of specialized skills and knowledge in aviation mechanics and safety protocols.