This document provides recommendations for the operation and production control of metal poder bed fusion (PBF) machines and processes for areas of critical applications. A critical application is assumed once failing parts-functionality leads to immediate threats. This document is applicable for production components and mechanical test specimens using powder bed fusion (PBF) with both laser and electron beams. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.