91.1308—Maintenance of records.
(a)
Any manufacturer that is participating in the in-use credit program set forth in this subpart shall establish, maintain, and retain the records required by § 91.209 with respect to its participation in the in-use credit program.
(b)
EPA may void ab initio a certificate of conformity for an engine family for which the manufacturer fails to retain the records required under this section or to provide such information to the Administrator upon request.