This SAE Recommended Practice sets forth the equipment, environment, and test procedures to beused in measuring sound levels of engines. The purpose is to provide a uniform method of measuring themaximum acoustical radiation from the exterior surfaces of an engine under representative engine operatingconditions. The measured sound levels will be useful in development of engines, comparison of engines, andinstallation of engines in various applications. The correlation of the measured engine sound levels to thevarious application sound levels will have to be developed.