Paccar, Inc. v. National Highway Traffic Safety Administration and Department of Transportation, Truck Equipment & Body Distributors Association v. National Highway Traffic Safety Administration and Department of Transportation, American Trucking Associations, Inc. v. National Highway Traffic Safety Administration and Department of Transportation

573 F.2d 632 PACCAR, INC., Petitioner, v. NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION and Department of Transportation, Respondents. TRUCK EQUIPMENT & BODY DISTRIBUTORS ASSOCIATION, Petitioner, v. NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION and Department of Transportation, Respondents. AMERICAN TRUCKING ASSOCIATIONS, INC., Petitioner, v. NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION and Department of Transportation, Respondents. Nos. 75-1017, 75-2831 and 75-3182. United States Court of Appeals, Ninth Circuit. April 17, 1978. Thomas W. Huber (argued), Seattle Wash., Geoffrey R. Myers (argued), Potomac, Md., Nelson J. Cooney (argued), Washington, D. C., for petitioners. Michael Kimmel (argued), Neil H. Koslowe (argued), Washington, D. C., for respondents. On Petition for Review of an Order of the National Highway Traffic Safety Administration. Before BROWNING, ELY and TRASK, Circuit Judges. ELY, Circuit Judge: 1 Paccar, Inc., the builder of Kenworth and Peterbilt trucks, the American Trucking Associations, Inc. (ATA) and the Truck Equipment and Body Distributors Association (TEBDA) challenge Motor Vehicle Safety Standard No. 121 (the Standard) regulating air-braked…