Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p28
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 28/43)
Character Range: 218032–221148

or glass-plastics pane(s) yield(s) and break(s), displaying numerous circular cracks centred approximately on the point of impact;

              3.4.3.3. Tears in the interlayer(s) are allowed provided that the manikin's head does not pass through the test piece;

              3.4.3.4. No large fragment of glass becomes detached from the interlayer.

              3.4.4. A set of test pieces submitted for approval shall be considered satisfactory with respect to behaviour under head impact, if all of the tests have given a satisfactory result.

              4. Optical qualities

               The provisions concerning the regular light transmittance set out in Annex 3, paragraph 9.1., shall apply to double glazed units or parts of multiple-glazed units located at places which are essential to the driver's vision.

Annex 13
  Grouping of windscreens for approval testing
              1. The windscreen's features taken into account are:

              1.1. The developed area,

              1.2. The height of segment,

              1.3. The curvature.

              2. A group is made up of a thickness class

              3. Classification is performed in ascending order of developed area

               The five largest and the five smallest developed areas shall be selected, and shall be numbered as follows:

               1 for the largest 1 for the smallest

               2 for the next largest after 1 2 for the next smallest after 1

               3 for the next largest after 2 3 for the next smallest after 2

               4 for the next largest after 3 4 for the next smallest after 3

               5 for the next largest after 4 5 for the next smallest after 4

              4. Within each of the two series defined under paragraph 3. above, the heights of segment shall be indicated as follows:

               1 for the greatest height of segment,

               2 for the next greatest,

               3 for the next greatest,

               etc.

              5. Within each of the two series defined under paragraph 3. above, the curvatures shall be indicated as follows:

               1 for the smallest curvature,

               2 for the next smallest,

               3 for the next smallest,

               etc.

              6. The numbers assigned to each windscreen in the two series defined under paragraph 3. above shall be added together

              6.1. The windscreen among those having the five largest areas which has the smallest total, and the windscreen among those having the five smallest areas which has the smallest total, shall be subjected to complete tests as defined in one of Annexes 4, 6, 8, 9 and 10.

              6.2. The other windscreens of the same series shall be subjected to the tests of optical qualities described in Annex 3, paragraph 9.

              7. A few windscreens having significantly different parameters of shape and/or curvature from the extremes of the selected groups may also be tested if the technical service conducting the tests considers that the parameters in question are likely to have