Section 301.51-7 - Assembly and inspection of regulated articles(a) Persons requiring certification or other services must request the services from an inspector at least 48 hours before the services are needed.(b) The regulated articles must be assembled at the place and in the manner that the inspector designates as necessary to comply with this subpart.62 FR 10416, Mar. 7, 1997, as amended at 87 FR 80006 , Dec. 29, 2022