D. Have a cover on the filler opening of the hopper, which screws into place, sealing the unit airtight. E. Have discharge tubes extending to the front of each rear wheel under the fender. F. Have no-clogging discharge with slush-proof, non-freezing rubber nozzles. G. Be operated by an electric switch with a telltale pilot light mounted on the instrument panel. H. Be exclusively driver controlled. I. Have a gauge to indicate the hopper needs refilling when it is down to one quarter full. 2. Automatic traction chains may be installed. Trash Container and Holding Device 1. required or used, the trash container shall: A. Be of fire resistant polyethylene or equivalent material. B. Be no greater than capacity. C. Be secured by a holding device that is designed to prevent movement and allow easy removal and replacement. D. Be installed in an accessible location in the driver’s compartment, not obstructing passenger use of the service door or access to emergency equipment. Undercoating 1. The entire underside of the bus body, including floor sections, the cross member and below floor line side panels, shall be coated with rust-proofing the compound for which compound manufacturer has issued notarized certification of compliance to the bus body builder that the compound meets or exceeds all performance and qualitative requirements of paragraph 3.4 of Federal Specification TT-C-250b using modified test procedures for the following requirements*: A. Salt spray resistance-pass modified to 5% salt and 1000 hours. B. Abrasion resistance-pass. C. Fire resistance-pass. *Test panels are to be prepared in accordance with paragraph 4.6.12 of TT-C-520b with the modified procedure requiring that the test be made on a 48-hour air-cured film at a thickness recommended by the compound manufacturer.
D. Have a cover on the filler opening of the hopper, which screws into place, sealing the unit airtight. E. Have discharge tubes extending to the front of each rear wheel under the fender. F. Have no-clogging discharge with slush-proof, non-freezing rubber nozzles. G. Be operated by an electric switch with a telltale pilot light mounted on the instrument panel. H. Be exclusively driver controlled. I. Have a gauge to indicate the hopper needs refilling when it is down to one quarter full. 2. Automatic traction chains may be installed. Trash Container and Holding Device 1. required or used, the trash container shall: A. Be of fire resistant polyethylene or equivalent material. B. Be no greater than capacity. C. Be secured by a holding device that is designed to prevent movement and allow easy removal and replacement. D. Be installed in an accessible location in the driver’s compartment, not obstructing passenger use of the service door or access to emergency equipment. Undercoating 1. The entire underside of the bus body, including floor sections, the cross member and below floor line side panels, shall be coated with rust-proofing the compound for which compound manufacturer has issued notarized certification of compliance to the bus body builder that the compound meets or exceeds all performance and qualitative requirements of paragraph 3.4 of Federal Specification TT-C-250b using modified test procedures for the following requirements*: A. Salt spray resistance-pass modified to 5% salt and 1000 hours. B. Abrasion resistance-pass. C. Fire resistance-pass. *Test panels are to be prepared in accordance with paragraph 4.6.12 of TT-C-520b with the modified procedure requiring that the test be made on a 48-hour air-cured film at a thickness recommended by the compound manufacturer.