Assisting in producing, reviewing, revising, and interpreting technical documents; assisting in designing, fabricating, assembling, troubleshooting, and repairing electrical, electronic, and mechanical systems, subsystems, components, test fixtures, and prototypes; developing and performing equipment and component adjustment, test, and certification processes; and in installing equipment and modifications. Moderate lifting and carrying (50 lbs.), straight pushing and pulling, reaching above shoulders, use of fingers and both hands required, walking and standing, repeated bending, climbing, crawling, kneeling (use of both legs and arms), operation of crane, truck, tractor, or motor vehicle, both eyes required with depth perception and ability to distinguish basic colors and shades of colors, hearing (aid permitted).