Document ID: chunk:federal_register_of_legislation:F2025L00028:reg:16:p4
Version: federal_register_of_legislation:F2025L00028
Segment Type: reg
Provision Reference: reg 16 (pt 4/4)
Character Range: 121273–122142

centre line of the impactor should be aligned with the centre line of the rib's guide system.
5.9.5.  The impact severity is specified by the drop heights of 815, 204 and 459 mm. These drop heights result in velocities of approximately 4, 2 and 3 m/s respectively. Impact drop heights should be applied with an accuracy of 1 per cent.
5.9.6. The rib displacement should be measured, for instance using the rib's own displacement transducer.
5.9.7. The rib certification requirements are given in Table 5 of this annex.
5.9.8. The performance of the rib module can be adjusted by replacing the tuning spring inside the cylinder with one of a different stiffness.
       Table 5
       Requirements for full rib module certification

               Drop height        Minimum displacement  Maximum displacement
Test sequence  (accuracy 1%)(mm)  (mm)                  (mm)