Document ID: chunk:federal_register_of_legislation:F2019C00042:reg:1:p5
Version: federal_register_of_legislation:F2019C00042
Segment Type: reg
Provision Reference: reg 1 (pt 5/21)
Character Range: 182171–185118

paragraph 3.2.2. below):

         2.7. "Design torso angle" means the angle measures between a vertical line through the "R" point and the torso line in a position which corresponds to the design position of the seat‑back established by the vehicle manufacturer;

         2.8. "Centreplane of occupant" (C/LO) means the median plane of the 3‑D H machine positioned in each designated seating position; it is represented by the co‑ordinate of the "H" point on the "Y" axis. For individual seats, the centreplane of the seat coincides with the centreplane of the occupant. For other seats, the centreplane of the occupant is specified by the manufacturer;

         2.9. "Three‑dimensional reference system" means a system as described in Appendix 2 to this annex;

         2.10. "Fiducial marks" are physical points (holes, surfaces, marks or indentations) on the vehicle body as defined by the manufacturer;

         2.11. "Vehicle measuring attitude" means the position of the vehicle as defined by the co‑ordinates of fiducial marks in the three‑dimensional reference system.

         3. REQUIREMENTS

         3.1. Data presentation

          For each seating position where reference data are required in order to demonstrate compliance with the provisions of the present Regulation, all or an appropriate selection of the following data shall be presented in the form indicated in Appendix 3 to this annex:

         3.1.1. the co‑ordinates of the "R" point relative to the three‑dimensional reference system;

         3.1.2. the design torso angle;

         3.1.3. all indications necessary to adjust the seat (if it is adjustable) to the measuring position set out in paragraph 4.3. below.

         3.2. Relationship between measured data and design specifications

         3.2.1. The co‑ordinates of the "H" point and the value of the actual torso angle obtained by the procedure set out in paragraph 4. below shall be compared, respectively, with the co‑ordinates of the "R" point and the value of the design torso angle indicated by the vehicle manufacturer.

         3.2.2. The relative positions of the "R" point and the "H" point and the relationship between the design torso angle and the actual torso angle shall be considered satisfactory for the seating position in question if the "H" point, as defined by its co‑ordinates, lies within a square of 50 mm side length with horizontal and vertical sides whose diagonals intersect at the "R" point, and if the actual torso angle is within 5° of the design torso angle.

         3.2.3. If these conditions are met, the "R" point and the design torso angle, shall be used to demonstrate compliance with the provisions of this Regulation.

         3.2.4. If the "H" point or the actual torso angle does not satisfy the requirements of paragraph 3.2.2. above, the "H" point and the actual torso angle shall be determined twice more (three times in all). If the results of