Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p1
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 1/43)
Character Range: 149227–152733

1                       1            2

9.3.3.2. Other secondary characteristics
               No other secondary characteristics are involved.

              9.3.4. Number of windscreens

               Four windscreens shall be submitted for testing.

Figure 14

Example of observation by the collimation-telescope test method

              9.3.5.  Interpretation of Results

               A windscreen type shall be considered satisfactory with respect to secondary image separation if, in the four windscreens submitted for testing, separation of the primary and secondary – images does not exceed the values given below for each zone or test area.

                                                                                                                       Maximum values of optical
Vehicle category                                                             Zone                                      distortion
M1 and N1                                                                    A - extended according to para. 9.2.2.1.  15' of arc

B - reduced according to para. 2.4. of  Annex 18                             25'of arc
M and N categories other than M1                                             I                                         15' of arc
Agricultural vehicles etc. for which it is not possible to determine zone I  I'                                        15' of arc

              9.3.5.1. No measurements shall be made in a peripheral area 25 mm inboard of the design glass outline and of any opaque obscuration, provided that it does not impinge into the extended zone A or zone I.
              9.3.5.2. For agricultural and forestry tractors and for construction-site vehicles, no measurements shall be made in a peripheral area 100 mm wide.
              9.3.5.3. In the case of split windscreens, no measurements shall be made in a strip 35 mm from the edge of the windscreen, which is adjacent to the dividing pillar.
              9.3.5.4. A maximum value of 25' of arc is permitted for all portions of zone I or zone A in a peripheral area 100 mm inboard of the design glass outline.
              9.3.5.5. Slight deviations from the requirements may be allowed in the reduced test area B according to paragraph 2.4. of Annex 18 provided they are localized and recorded in the report.
              10. Burning behaviour (fire-resistance) test
              10.1. Purpose and scope of application
               This method enables the horizontal burning rate of materials used in the passenger compartment of motor vehicles (for example, private passenger cars, lorries (trucks), estate cars, motor coaches) after exposure to a small flame to be determined.

               This method permits testing of materials and components of a vehicle's interior equipment individually or in combination up to a thickness of 13 mm. It is used to judge the uniformity of production lots of such materials with respect to their burning behaviour.

               Because of the many differences between the real-world situation (application and orientation within a vehicle, conditions of use, ignition source, etc.) and the precise test conditions prescribed herein, this method cannot be considered as suitable for evaluation of all true in-vehicle burning characteristics.

              10.2. Definitions
              10.2.1. Burning rate: The quotient of the burnt distance measured according to this method and the time taken to burn that distance.