Interpretation ID: aiam0570
Engineering Manager
Truck Trailer Manufacturers Association
1413 K Street
N.W.
Washington
DC 20005;
Dear Mr. Grey: This is in reply to your letter of December 20, 1971, asking whethe the Certification regulations (Docket Nos. 70-6, 70-8, 70-15) apply to pole trailers. The Docket numbers you refer to also include the regulations concerning 'Vehicles Manufactured in Two or More Stages.'; As there are no motor vehicle safety standards presently applicable t pole trailers, neither the Certification regulations (49 CFR Part 567) nor the regulations governing 'Vehicles Manufactured in Two or More Stages' (49 CFR Part 568) apply to them. As you were informally informed, however, pole trailers manufactured on or after January 1, 1973, that are equipped with air brake systems would be required to comply with Motor Vehicle Safety Standard No. 121, and their manufacturers would be required to comply with the Certification regulations and, where applicable, the regulations governing Vehicles Manufactured in Two or More Stages.; Sincerely, Richard B. Dyson, Assistant Chief Counsel