||Musical Instrument Repairers and Tuners
- Play instruments to evaluate their sound quality and to locate any defects.
- Compare instrument pitches with tuning tool pitches to tune instruments.
- Strike wood, fiberglass, or metal bars of instruments, and use tuned blocks, stroboscopes, or electronic tuners to evaluate tones made by instruments.
||Signal and Track Switch Repairers
- Test and repair track circuits.
- Test air lines and air cylinders on pneumatically operated gates.
- Listen to engines, examine vehicle frames, or confer with customers to determine nature and extent of malfunction or damage.
- Reassemble and test subassembly units.
||Bus and Truck Mechanics and Diesel Engine Specialists
- Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions.
- Inspect, test, and listen to defective equipment to diagnose malfunctions, using test instruments such as handheld computers, motor analyzers, chassis charts, or pressure gauges.
||Motorboat Mechanics and Service Technicians
- Start motors and monitor performance for signs of malfunctioning, such as smoke, excessive vibration, or misfiring.
- Idle motors and observe thermometers to determine the effectiveness of cooling systems.
||Manufactured Building and Mobile Home Installers
- Inspect, examine, and test the operation of parts or systems to evaluate operating condition and to determine if repairs are needed.
- Open and close doors, windows, and drawers to test their operation, trimming edges to fit, using jackplanes or drawknives.
||Helpers--Installation, Maintenance, and Repair Workers
- Examine and test machinery, equipment, components, and parts for defects to ensure proper functioning.
- Tend and observe equipment and machinery to verify efficient and safe operation.
||Industrial Machinery Mechanics
- Operate newly repaired machinery or equipment to verify the adequacy of repairs.
- Observe and test the operation of machinery or equipment to diagnose malfunctions, using voltmeters or other testing devices.
||Maintenance Workers, Machinery
- Start machines and observe mechanical operation to determine efficiency and to detect problems.
- Inspect or test damaged machine parts, and mark defective areas or advise supervisors of repair needs.
- Inspect and test docks, ships, buoyage systems, plant intakes or outflows, or underwater pipelines, cables, or sewers, using closed circuit television, still photography, and testing equipment.
- Carry out non-destructive testing, such as tests for cracks on the legs of oil rigs at sea.
||Aircraft Mechanics and Service Technicians
- Test operation of engines and other systems, using test equipment, such as ignition analyzers, compression checkers, distributor timers, or ammeters.
- Listen to operating engines to detect and diagnose malfunctions, such as sticking or burned valves.
||Wind Turbine Service Technicians
- Start or restart wind turbine generator systems to ensure proper operations.
||Electric Motor, Power Tool, and Related Repairers
- Test equipment for overheating, using speed gauges and thermometers.
||Computer, Automated Teller, and Office Machine Repairers
- Operate machines to test functioning of parts or mechanisms.
||Railroad Brake, Signal, and Switch Operators and Locomotive Firers
- Monitor trains as they go around curves to detect dragging equipment and smoking journal boxes.
||Farm Equipment Mechanics and Service Technicians
- Reassemble machines and equipment following repair, testing operation and making adjustments, as necessary.
||Watch and Clock Repairers
- Test timepiece accuracy and performance, using meters and other electronic instruments.
||Medical Equipment Repairers
- Test, evaluate, and classify excess or in-use medical equipment and determine serviceability, condition, and disposition, in accordance with regulations.
||Electrical and Electronics Repairers, Commercial and Industrial Equipment
- Set up and test industrial equipment to ensure that it functions properly.
||Outdoor Power Equipment and Other Small Engine Mechanics
- Test and inspect engines to determine malfunctions, to locate missing and broken parts, and to verify repairs, using diagnostic instruments.