Document ID: chunk:federal_register_of_legislation:F2019L00026:front:0:p34
Version: federal_register_of_legislation:F2019L00026
Segment Type: other
Provision Reference: 
Character Range: 94330–97087

extraction shall be in the direction in which it normally occurs when the retractor is installed in a vehicle.
              7.6.2.1.2. When retractors are being tested for sensitivity to vehicle deceleration they shall be tested at the above extraction along two perpendicular axes, which are horizontal if the retractor is installed in a vehicle as specified by the safety-belt manufacturer. When this position is not specified, the testing authority shall consult the safety-belt manufacturer. One of these axes shall be in the direction chosen by the Technical Service conducting the approval test to give the most adverse conditions with respect to actuation of the locking mechanism.
              7.6.2.2. A suitable apparatus for the tests specified in paragraph 7.6.2.1. above is described in Annex 4 to this Regulation. The design of any such test apparatus shall ensure that the required acceleration is given before the webbing is withdrawn out of the retractor by more than 5 mm and that the withdrawal takes place at an average rate of increase of acceleration of at least 55 g/s[8] and not more than 150 g/s8 in testing sensitivity for strap movement and of at least 25 g/s8 and not more than 150 g/s8 in testing sensitivity for vehicle deceleration.8
              7.6.2.3. To check conformity with the requirements of paragraphs 6.2.5.3.1.3. and 6.2.5.3.1.4., the retractor shall be mounted on a horizontal table and the table tilted with a speed not exceeding 2° per second until locking has occurred. The test shall be repeated with tilting in other directions to ensure that the requirements are fulfilled.
              7.6.3. Dust resistance
              7.6.3.1. The retractor shall be positioned in a test chamber as described in Annex 5 to this Regulation. It shall be mounted in an orientation similar to that in which it is mounted in the vehicle. The test chamber shall contain dust as specified in paragraph 7.6.3.2. below. A length of 500 mm of the strap shall be extracted from the retractor and kept extracted, except that it shall be subjected to 10 complete cycles of retraction and withdrawal within one or two minutes after each agitation of the dust. For a period of five hours, the dust shall be agitated every 20 minutes for five seconds by compressed air free of oil and moisture at a gauge pressure of 5.5 · 105 ± 0.5 · 105 Pa entering through an orifice, 1.5  0.1 mm in diameter.
              7.6.3.2. The dust used in the test described in paragraph 7.6.3.1. above shall consist of about 1 kg of dry quartz. The particle size distribution is as follows:
               (a) Passing 150 μm aperture, 104 μm wire diameter:  99 to 100 per cent;
               (b) Passing 105 μm aperture,   64 μm wire diameter:  76