Interpretation ID: aiam1414
Transportation Supervisor
West Branch - Rose City Area Schools
School Bus Garage
224 Thomas Street
West Branch
MI 48661;
Dear Mr. Rose: This responds to your February 8, 1974, letter asking whether antiloc devices are required on air-braked buses manufactured after September 1, 1974, if the chassis manufacturer is the party for compliance, and whether the September 1, 1974, effective date will be delayed.; The National Highway Traffic Safety Administration has issued Standard No. 121 on air brake systems, of which Docket 73-13, Notice 3, is only one part. It regulates all air-braked motor vehicles, including new school buses, manufactured after the effective date. We have delayed the effective date to January 1, 1975, and eased the requirements somewhat for an introductory period of January 1, 1975, to September 1, 1975.; As you stated, the regulation is directed to chassis manufacturers an dealers, who under the law are prohibited from selling vehicles which do not comply with the standard.; The standard does not require antilock devices, but generall manufacturers have indicated that they will use an antilock system to meet the requirements of the standard.; Yours truly, Richard B. Dyson, Assistant Chief Counsel