Diagnose, adjust, repair, or overhaul aircraft engines and assemblies, such as hydraulic and pneumatic systems. Includes helicopter and aircraft engine specialists.

Install, program, maintain, or repair security or fire alarm wiring and equipment. They ensure that work is in accordance with relevant codes.

Repair, adjust, or install audio or television receivers, stereo systems, camcorders, video systems, or other electronic home entertainment equipment.

Install, diagnose, or repair communications, sound, security, or navigation equipment in motor vehicles.

Inspect, test, repair, or maintain electrical equipment in generating stations, substations, and in service relays.

Repair, test, adjust, or install electronic equipment, such as industrial controls, transmitters, and antennas.

Install, adjust, or maintain mobile electronics communication equipment, including sound, sonar, security, navigation, and surveillance systems on trains, watercraft, or other mobile equipment.

Repair, maintain, or install electric motors, wiring, or switches.

Install, inspect, test, adjust, or repair avionics equipment, such as radar, radio, navigation, and missile control systems in aircraft or space vehicles.

Install, set up, rearrange, or remove switching, distribution, routing, and dialing equipment used in central offices or headends. They service or repair telephone, cable television, internet, and other communications equipment on customers' property. They install communications equipment or communications wiring in buildings.