[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR393.201] [Page 1125] TITLE 49--TRANSPORTATION CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 393--PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of Contents Subpart J--Frames, Cab and Body Components, Wheels, Steering, and Suspension Systems Sec. 393.201 Frames. Source: 53 FR 49402, Dec. 7, 1988, unless otherwise noted. (a) The frame of every bus, truck, and truck tractor shall not be cracked, loose, sagging or broken. (b) Bolts or brackets securing the cab or the body of the vehicle to the frame must not be loose, broken, or missing. (c) The frame rail flanges between the axles shall not be bent, cut or notched, except as specified by the manufacturer. (d) All accessories mounted to the truck tractor frame must be bolted or riveted. (e) No holes shall be drilled in the top or bottom rail flanges, except as specified by the manufacturer. (f) Field repairs are allowed.