Tests, traces and locates defects, repairs, and makes precise adjustments to hydraulic, pneumatic, electrical, fuel, propulsion, and control surface components, assemblies, and systems of guided missiles. Pressure tests hydraulic, pneumatic, fuel and propulsion systems, and test operates electrical system and control surface linkages and components to detect malfunctions. Traces and locates cause of problems, determines the type and extent of repair required, and repairs and replaces any defective parts, units, components, and assemblies of the various systems. Makes and insures fits and adjustments in and between the various units, components, and assemblies are within allowed tolerances and specifications.