Document ID: chunk:federal_register_of_legislation:F2019L00026:front:0:p38
Version: federal_register_of_legislation:F2019L00026
Segment Type: other
Provision Reference: 
Character Range: 104426–107172

two parts of the buckle entails no risk of reducing the reliability of locking.
              7.7.3. The free ends of the straps shall extend sufficiently far beyond the adjusting devices to allow for slip.
              7.7.4. Deceleration or acceleration devices
               The applicant shall choose to use one of the two following devices:
              7.7.4.1. Deceleration test device
               The trolley shall be so propelled that at the moment of impact its free running speed is 50 km/h ± 1 km/h and the manikin remains stable. The stopping distance of the trolley shall be 40 cm ± 5 cm. The trolley shall remain horizontal throughout deceleration. The deceleration of the trolley shall be achieved by using the apparatus described in Annex 6 to this Regulation or any other device giving equivalent results. This apparatus shall comply with the performance hereafter specified:
               The deceleration curve of the trolley, weighted with inert mass to produce a total mass of 455 kg ± 20 kg for safety-belts tests and 910 kg ± 40 kg for restraining systems tests where the nominal mass of the trolley and vehicle structure is 800 kg, shall remain within the hatched area of the graph in Annex 8. If necessary, the nominal mass of the trolley and attached vehicle structure can be increased by increments of 200 kg, in which case, an additional inert mass of 28 kg per increment shall be added. In no case shall the total mass of the trolley and vehicle structure and inert masses differ from the nominal value for calibration tests by more than ±40 kg. During calibration of the stopping device, the speed of the trolley shall be 50 km/h ± 1 km/h and the stopping distance shall be of 40 cm ± 2 cm.
              7.7.4.2. Acceleration test device
               The trolley shall be so propelled that its total velocity change V is
              51 km/h  km/h. The trolley shall remain horizontal during the acceleration. The acceleration of the trolley shall be achieved by using the apparatus complying with the performance hereafter specified:
               The acceleration curve of the trolley, weighted with inert mass, shall remain within the hatched area of the graph in Annex 8, and stay above the segment defined by the coordinates 10 g, 5 ms and 20 g, 10 ms. The start of the impact (T0) is defined, according to ISO 17 373 (2005) for a level of acceleration of 0.5 g. In no case shall the total mass of the trolley and vehicle structure and inert masses differ from the nominal value for calibration tests by more than ±40 kg. During calibration of the acceleration test device, trolley's total velocity change V shall be 51 km/h  km/h.
               Despite the fulfilment of the above requirements,