A professional who inspects, tests, repairs, maintains, services, and modifies experimental and prototype aircraft, engines, accessories, and components according to governmental, company, and customer requirements. Respnsibilities include:

• Assembles and installs aircraft electrical, plumbing, mechanical, and structural accessories and components, such as ejection seats, hatch mechanisms, and safety belts, using handtools and power tools.
• Installs, operates, and adjusts test apparatus, such as recorders, oscillographs, limit switches, inverters, thermocouples, instruments, cameras, timing devices, and photo recorders.
• Operates aircraft engines and systems, such as hydraulic, air-conditioning, pressurization, fuel, controls, and landing gear, to diagnose malfunctions, using test equipment, such as hydraulic test bench, pressure ratio bench, water injection test cart, and ground power unit.
• Repairs, adjusts, aligns, and calibrates aircraft systems.
• Modifies aircraft structure or components following drawings, engineering orders, and other technical publications, as required.
• Services and maintains gaseous, liquid oxygen, pneumatic, and hydraulic systems on aircraft.
• May specialize in testing and modifying spacecraft systems and be designated Experimental Mechanic, Spacecraft.