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

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

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.

Repair, install or maintain mobile or stationary radio transmitting, broadcasting, and receiving equipment, and two way radio communications systems used in cellular telecommunications, mobile broadband, ship to shore, aircraft to ground communications, and radio equipment in service and emergency vehicles. They test and analyze network coverage.

Operate self propelled mining machines that rip coal, metal and nonmetal ores, rock, stone, or sand from the mine face and load it onto conveyors or into shuttle cars in a continuous operation.

Operate a variety of drills such as rotary, churn, and pneumatic to tap sub surface water and salt deposits, to remove core samples during mineral exploration or soil testing, and to facilitate the use of explosives in mining or construction. They use explosives. Includes horizontal and earth boring machine operators

Assemble, install, repair, or maintain electric or hydraulic shipment or passenger elevators, escalators, or dumbwaiters.

Drive logging tractor or wheeled vehicle equipped with one or more accessories such as bulldozer blade, frontal shear, grapple, logging arch, cable winches, hoisting rack, or crane boom, to fell tree; to skid, load, unload, or stack logs; or to pull stumps or clear brush.

Set up, test, and adjust manufacturing machinery or equipment, using any combination of electrical, electronic, mechanical, hydraulic, pneumatic, or computer technologies.