Document ID: chunk:federal_register_of_legislation:F2006L02678:body:0:p20
Version: federal_register_of_legislation:F2006L02678
Segment Type: other
Provision Reference: 
Character Range: 57096–59870

power source, the design shall ensure that the retractor locks automatically upon failure or interruption of that signal or power source.

       6.2.5.3.2 A retractor with multiple sensitivity must satisfy the specification above, when tested in accordance with paragraph 7.6.2.  In addition if one of the sensitivities relates to strap extraction, locking must have occurred at a strap acceleration equal to or more than 1.5 g in the case of type 4 or more than 2.0 g1   in the case of 'Type 4N Retractors', when measured along the line of the extraction of the strap.

       6.2.5.3.3 In the case of the tests mentioned in paragraphs 6.2.5.3.1 and 6.2.5.3.2 above the amount of strap movement which may occur before the retractor locks shall not exceed 50 mm starting at the length given in paragraph 7.6.2.1. In the case of the test mentioned in paragraph 6.2.5.3.1.2 above locking must not occur during the 50mm of strap movement starting at the length given in paragraph 7.6.2.1.

       6.2.5.3.4 If the retractor is part of a lap belt, the retracting force of the strap shall be not less than 0.7 daN when measured in the free length between the dummy and the retractor in accordance with paragraph 7.6.4.  If the retractor is part of an upper torso restraint, the retracting force of the strap shall be not less than 0.2 daN and not more than 0.7 daN when similarly measured.  If the strap passes through a guide or pulley, the retractor force shall be measured in the free length between the dummy and the guide or pulley.  If the assembly incorporates a device that upon manual or automatic operation prevents the strap from being completely retracted, such a device shall not be operated when these requirements are assessed.

       6.2.5.3.5 The strap shall be withdrawn from the retractor and allowed to retract repeatedly by the method described in paragraph 7.6.1 until 40,000 cycles have been completed.  The retractor shall then be subjected to the corrosion test given in paragraph 7.2 and after that to the dust test prescribed in paragraph 7.6.3.

        It shall then satisfactorily complete a further 5,000 cycles (making 45,000 in all).  After the above tests, the retractor shall operate correctly and still meet the requirements of paragraphs 6.2.5.3.1, 6.2.5.3.2, 6.2.5.3.3 and 6.2.5.3.4 above.

       7.6 ADDITIONAL TESTS FOR SAFETY BELTS WITH RETRACTORS

       7.6.1 Durability of retractor mechanism

       7.6.1.1   The strap shall be withdrawn and allowed to retract for the required number of cycles at a rate of not more than 30 cycles per minute.  In the case of emergency locking 'Type 4N Retractors', a snatch to lock the retractor shall be introduced at each fifth cycle.

        The snatches shall occur in equal numbers at each