Champion Bus (Champion) is recalling certain model year 2013-2015 American Crusader, American Coach, Challenger, Crusader, CTS-FE, CTS-RE, Defender, EZ Trans, HCAC, HC, DFUC, LF Transport, Premier, and Spirit transit buses manufactured March 1, 2013, to June 12, 2015. In the affected vehicles, the passenger seat belts may rub against the metal seat frame and fray. As a result, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 209, “Seat Belt Assemblies.”