Section 86.085-37 - Production vehicles and engines(a) Any manufacturer obtaining certification under this part shall supply to the Administrator, upon request, a reasonable number of production vehicles (or engines) selected by the Administrator which are representative of the engines, emission control systems, fuel systems, and transmission offered and typical of production models available for sale under the certificate. These vehicles (or engines) shall be supplied for testing at such time and place and for such reasonable periods as the Administrator may require. Heavy-duty engines supplied under this paragraph may be required to be mounted in chassis and appropriately equipped for operation on a chassis dynamometer.(c) Any heavy-duty engine or gasoline-fueled heavy-duty vehicle manufacturer obtaining certification under this part shall notify the Administrator, on a yearly basis, of the number of engines or vehicles of such engine family-evaporative emission family-engine displacement-exhaust emission control system-fuel system combination produced for sale in the United States during the preceding year.48 FR 1455, Jan. 12, 1983, as amended at 59 FR 50073, Sept. 30, 1994; 62 FR 31233, June 6, 1997; 79 FR 23690 , Apr. 28, 2014; 81 FR 73976 , Oct. 25, 2016