Supports engineering activities such as design, test, check-out, modification, fabrication, and assembly of prototype electro-mechanical systems, experimental design circuitry, or specialized test equipment. Works from schematics, diagrams, written, and verbal descriptions, layouts or defined plans to perform testing, checkout, and trouble-shooting functions. Performs operational test and fault isolation on systems and equipment. Assists in determining methods or actions to remedy malfunctions. Assists in the design, construction, test, and check-out of test equipment.