Interpretation ID: aiam0312

Mr. John L. MacLaren, General Manager, Western Safety Devices Company, 4041 Hollis Street, Emeryville, CA 94608; Mr. John L. MacLaren
General Manager
Western Safety Devices Company
4041 Hollis Street
Emeryville
CA 94608;

Dear Mr. MacLaren: In response to your letter of March 10, 1971, to Mr. Douglas W. Toms Administrator, National Highway Traffic Safety Administration, concerning Federal Motor Vehicle Safety Standard No. 121, Air Brake Systems, Trucks, Buses and Trailers, the following information is offered.; >>>1. Standard No. 121 applies only to new vehicles manufactured on o after January 1, 1973.; 2. Federal Motor Vehicle Safety Standard No. 121 does not preclude th use of a dashboard-mounted control for the tractor protection valve.; 3. Standardization of a dashboard- mounted control valve is no contemplated at the present time.; 4. A petition requesting reconsideration of the requirements for parking brake control valve in S5.4.6 has been received and is being considered at the present time. The decision in response to this and other petitions will be published in the *Federal Register* in the near future.<<<; Sincerely, E. T. Driver, Director, Office of Operating Systems, Moto Vehicle Programs;