Conducts the mechanical work pertaining to the test, such as, but not limited to, honing cylinders, grinding valves and valve seats, machining of parts, burring crankcases to obtain clearances, build special test fixtures, measure parts as necessary, repair parts by welding or brazing, disassembly and repair of special test equipment, change carburetor or injector calibration, change any part or special test component as required, determine and repair any engine malfunction. SUMMARY: Performs research and development testing and analysis of new engines and/or components and design improvements of existing equipment, determines characteristics of an engine, engine components, or end item equipment and is responsible for validity of test results and instrumentation used in tests.