Clean rooms Facility/Operation Cleanliness Mechanical Not controlled Manufacturing Electronic assembly Class 10,000 ectromechanica Class 100 assembly Inertial instruments Class 100 Optical assembly Class 100 Spacecraft Assembly Class 100,000 and test 6/21/20046/21/2004 6 Clean Rooms Facility/Operation Cleanliness Mechanical Manufacturing Not controlled Electronic assembly Class 10,000 Electromechanical assembly Class 100 Inertial instruments Class 100 Optical Assembly Class 100 Spacecraft Assembly and Test Class 100,000