(a) Section numbering. The model year of initial applicability is indicated by the section number. The digits following the hyphen designate the first model year for which a section is applicable. The section continues to apply to subsequent model years unless a later model year section is adopted. (Example: Sec. 86.13xx-2004 applies to the 2004 and subsequent model years. If a Sec. 86.13xx-2007 is promulgated it would apply beginning with the 2007 model year; Sec. 86.13xx-2004 would apply to model years 2004 through 2006.)
(b) A section reference without a model year suffix refers to the section applicable for the appropriate model year. [65 FR 59958, Oct. 6, 2000. Redesignated and amended at 70 FR 40438, July 13, 2005]