Document ID: chunk:federal_register_of_legislation:F2025L00028:reg:16:p2
Version: federal_register_of_legislation:F2025L00028
Segment Type: reg
Provision Reference: reg 16 (pt 2/4)
Character Range: 116338–119193

same part should be at least 30 minutes.
5.5. Head
              5.5.1.  The head sub assembly, including the upper neck load cell replacement, is certified in a drop test from 200  ± 1 mm onto a flat, rigid impact surface.
5.5.2.  The angle between the impact surface and the mid-sagittal plane of the head is 35 ± 1° allowing an impact to the upper part of the head side (this can be realised with a sling harness or a head drop support bracket with a mass of 0.075  ± 0.005 kg.).
5.5.3. The peak resultant head acceleration, filtered using ISO 6487:2000 CFC 1000, should be between and including 100 g and 150 g.
5.5.4. The head performance can be adjusted to meet the requirement by altering the friction characteristics of the skin-skull interface (e.g. by lubrication with talcum powder or polytetrafluoretheen (PTFE) spray).
5.6. Neck
5.6.1. The head-neck interface of the neck is mounted to a special certification head-form with a mass of 3.9 ± 0.05 kg (see Figure 6), with the help of a 12 mm thick interface plate with a mass of 0.205 ± 0.05 kg.
5.6.2. The head-form and neck are mounted upside-down to the bottom of a neck- pendulum[10] allowing a lateral motion of the system.
5.6.3. The neck-pendulum is equipped with a uni-axial accelerometer according to the neck pendulum specification (see Figure 5).
5.6.4.  The neck-pendulum should be allowed to fall freely from a height chosen to achieve an impact velocity of 3.4 ± 0.1 m/s measured at the pendulum accelerometer location.
5.6.5. The neck-pendulum is decelerated from impact velocity to zero by an appropriate device,[11] as described in the neck pendulum specification (see Figure 5), resulting in a velocity change - time history inside the corridor specified in Figure 7 and Table 4 of this annex. All channels have to be recorded according to the ISO 6487:2000 or SAE J211 (March 1995) data channel recording specification and filtered digitally using ISO 6487:2000 CFC 180 or SAE J211:1995 CFC 180. The pendulum deceleration has to be filtered using ISO 6487:2000 CFC 60 OR SAE J211:1995 CFC 60.
       Table 4
       Pendulum velocity change - time corridor for neck certification test

Upper boundary                  Lower boundary
time (s)        Velocity (m/s)  time (s)        Velocity (m/s)
0.001           0.0             0               -0.05
0.003           -0.25           0.0025          -0.375
0.014           -3.2            0.0135          -3.7
                                0.017           -3.7

5.6.6.  The maximum head-form flexion angle relative to the pendulum (Angle dθA + dθC in Figure 6) should be between and including 49.0 and 59.0 degrees and should occur between and including 54.0 and 66.0 ms.
5.6.7.  The maximum head-form centre of gravity displacements measured in angle dθA and dθB (see Figure 6) should be: Fore pendulum base angle dθA between