Aircraft Maintenance Technician, as use in the United States, refers to an individual who holds a Mechanic certificate issued by the Federal Aviation Administration; the rules for certification, and for certificate-holders, are detailed in Subpart D of Part 65 of the Federal Aviation Regulations (FAR's), which are part of Title 14 of the Code of Federal Regulations. Aircraft Maintenance Technicians (AMT's) inspect and perform or supervise maintenance, preventive maintenance, and alteration of aircraft and aircraft systems.