Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p20
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 56174–59048

defined as a structural section of the superstructure forming a closed loop between two planes which are perpendicular to the vertical longitudinal centre plane (VLCP) of the vehicle.  A bay contains one window (or door) pillar on each side of the vehicle as well as side wall elements, a section of the roof structure and a section of the floor and underfloor structure.  Every bay has a transverse centre plane (CP) perpendicular to the VLCP of the vehicle and passing through the centre points (Cp)
       of the window-pillars (see figure A4.2)

       2.2.              The Cp is defined as a point at half window height and halfway across the pillar width.  If the Cp of the left-side and right- side pillars of a bay are not in the same transverse plane, the CP of the bay is set halfway between the transverse planes of the two Cp's.

       2.3. The length of a bay is measured in the direction of the longitudinal axis of the vehicle, and is determined by the distance between two planes perpendicular to the VLCP of the vehicle.  There are two limits which define the length of a bay:  the window (door) arrangement, and the shape and construction of the window (door) pillars.)

    Figure A4. 2 - Definition of length of bays

       2.3.1. The maximum length of a bay is defined by the length of the two neighbouring window (door) frames

            where:
            a = the length of the window (door) frame behind the jth pillar, and
    i)          b = the length of the window (door) frame in front of the jth pillar

       If the pillars on opposite sides of the bay are not in one transverse plane, or the window frames on each side of the vehicle have different lengths (see figure A4.3), the overall length, Wj of the bay is defined by:

                  ii)                                                           where:
                  iii)                                                           amin   =  the smaller value of aright side  or  aleft side
                  iv)                                                            bmin  =  the smaller value of bright side  or  bleft side
          L      =  the longitudinal offset between the centrelines of the pillars
         on the left and right sides of the vehicle

              Figure A4. 3 - Definition of bay length when pillars on each side of the bay
    are not in one transverse plane

       2.3.2. The minimum length of a bay shall include the whole window pillar (including its inclination, corner radii, etc.).  If the inclination and corner radii exceed half the length of the adjacent window then the next pillar shall be included in the bay.

       2.4. The distance between two bays shall be defined as the distance between their CP's.

       2.5. The distance of a bay from the centre of gravity of the vehicle shall be defined as the perpendicular