Document ID: chunk:federal_register_of_legislation:F2024C00147:body:0:p52
Version: federal_register_of_legislation:F2024C00147
Segment Type: other
Provision Reference: 
Character Range: 177351–180073

rp at each reference point shall not exceed 0.15 r.

       7.2.2.2. The difference between any of the radii of curvature (rp1, rp2 and rp3) and r shall not exceed 0.15 r.

       7.2.3. The value of "r" shall not be less than 1,000 mm nor greater than 1,500 mm.

       7.2.4. The value of the normal coefficient of reflection, determined according to the method described in annex 5 to this Regulation, shall not be less than 40%.  If the mirror has two positions ("day" and "night"), the "day" position shall allow the colours of the signals used for road traffic to be recognized.  The value of the normal coefficient of reflection in the "night" position shall not be less than 4%.

       7.2.5. The reflecting surface shall retain the characteristics specified in paragraph 7.2.4., in spite of prolonged exposure to adverse weather conditions, in normal conditions of use.

8. TESTS

       8.1. Rear‑view mirrors shall be subjected to the tests described in  paragraphs 8.2. and 8.3. below, to determine their behaviour under impact on and bending of the holder secured to the stem or support.

       8.2. Impact test

       8.2.1. Description of the test device:

       8.2.1.1. The test device shall consist of a pendulum capable of swinging about two horizontal axes at right angles to each other, one of which is perpendicular to the front plane containing the "release" trajectory of the pendulum.  The end of the pendulum shall comprise a hammer formed by a rigid sphere with a diameter of 165 + 1 mm and having a 5 mm‑thick rubber covering of Shore A 50 hardness.  A device shall be provided which permits determination of the maximum angle assumed by the arm in the plane of release.  There shall be a support firmly fixed to the structure supporting the pendulum which serves to hold the specimens in compliance with the impact requirements stipulated in paragraph 8.2.2.6. below.  Figure 1 below gives the dimensions of the test facility and the special design specifications.

       8.2.1.2. The centre of percussion of the pendulum shall coincide with the centre of the sphere which forms the hammer.  It is at a distance "1" from the axis of oscillation in the release plane which is equal to 1 m +5 mm.  The reduced mass of the pendulum to its centre of percussion is mo = 6.8 +0.05 kg.  The relationship between the centre of gravity of the pendulum and its axis of rotation is expressed in the equation:

        mo = m d.
                     1
(Dimensions in mm)

       Figure 1

       8.2.2. Description of the test:

       8.2.2.1. The procedure used to clamp the rear‑view mirror to the support shall be that recommended by the manufacturer of the device, or, where appropriate, by the