Document ID: chunk:federal_register_of_legislation:F2007C00099:body:0:p20
Version: federal_register_of_legislation:F2007C00099
Segment Type: other
Provision Reference: 
Character Range: 57067–59705

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 must 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 must consult the safety belt manufacturer.  One of these axes must 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 must ensure that the required acceleration is given at an average rate of increase of acceleration at least 25 g[1] per second.

7.6.2.5 To check conformity with the requirements of paragraph 6.2.5.3.1.3 and 6.2.5.3.1.4, the retractor must be mounted on a horizontal table and the table tilted with speed not exceeding 2o per second until locking has occurred.  The test must 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 must be positioned in a test chamber as described in annex 5 to this Regulation.  It must be mounted in an orientation similar to that in which it is mounted in the vehicle.  The test chamber must contain dust as specified in paragraph 7.6.3.2 below.  A length of 500 mm of the strap must be extracted from the retractor and kept extracted, except that it must be subjected to ten 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 must be agitated every twenty minutes for five seconds by compressed air free of oil and moisture at a gauge pressure of 5.5 x 105 ± 0.5 x 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 must consist of about 1 kg of dry quartz.  The particle size distribution is as follows:

(a) passing 150 m aperture, 104 m wire diameter:  99 to 100 per cent;

(b) passing 105 m aperture, 64 m wire diameter:  76 to 86 per cent;

 (c) passing 75 m aperture, 52 m wire diameter:  60 to 70 per cent.

7.6.4 Retracting force

7.6.4.1 withdrawal and retracting force must be measured with the safety belt assembly fitted to a dummy as for the dynamic test prescribed in paragraph 7.7.  The strap tension must be measured at the point of contact