---
kind: "section"
citation: "49 C.F.R. § 572.193"
title: "49"
number: "572.193"
heading: "Neck assembly."
url: "https://uscodex.org/cfr/49/572.193"
---

# §572.193. Neck assembly.

- (a) **The neck assembly consists of parts shown in drawing 180-2000.** For purposes of this test, the neck assembly is mounted within the headform assembly (180-9000) as shown in Figure V1 in appendix A to this subpart. When subjected to the test procedure specified in [paragraph (b)](#b) of this section, the neck-headform assembly shall meet the performance requirements specified in [paragraph (c)](#c) of this section.
- (b) **Test procedure.**
  - (1) Soak the assembly in a test environment as specified in [49 CFR 572.200(j)](/cfr/49/572.200.md?p=j);
  - (2) Attach the neck-headform assembly, as shown in Figure V2-A or V2-B in appendix A to this subpart, to the [49 CFR Part 572](/cfr/49/part572.md) pendulum test fixture (Figure 22, [49 CFR 572.33](/cfr/49/572.33.md)) in either the left or right lateral impact orientations, respectively, so that the midsagittal plane of the neck-headform assembly is vertical and at right angle (90 ±1 degrees) to the plane of motion of the pendulum longitudinal centerline;
  - (3) Release the pendulum from a height sufficient to achieve a velocity of 5.57 ±0.06 m/s measured at the center of the pendulum accelerometer, as shown in [49 CFR Part 572](/cfr/49/part572.md) Figure 15, at the instant the pendulum makes contact with the decelerating mechanism;
  - (4) The neck flexes without the neck-headform assembly making contact with any object;
  - (5) Time zero is defined as the time of initial contact between the pendulum mounted striker plate and the pendulum deceleration mechanism;
  - (6) **Allow a period of at least thirty (30) minutes between successive tests on the same neck assembly.**
- (c) **Performance Criteria.**
  - (1) The pendulum deceleration pulse is characterized in terms of decrease in velocity as obtained by integrating the pendulum acceleration output from time zero:
  - (2) The maximum translation-rotation of the midsagittal plane of the headform disk (180-9061 or 9062) in the lateral direction measured, with the rotation transducers specified in [49 CFR 572.200(e)](/cfr/49/572.200.md?p=e) shall be 71 to 81 degrees with respect to the longitudinal axis of the pendulum (see Figure V2-C in appendix A to this subpart) occurring between 50 and 70 ms from time zero;
  - (3) Peak occipital condyle moment shall not be higher than −36 Nm and not lower than −44 Nm. The moment measured by the upper neck load cell (Mx) shall be adjusted by the following formula: Mx(oc) 1 = Mx + 0.01778Fy;
  - (4) The decaying moment shall cross the 0 Nm line after peak moment between 102 ms-126 ms after time zero.

## Notes

### Amendments

[71 FR 75370, Dec. 14, 2006, as amended at 74 FR 29895, June 23, 2009]

### Source

Source: 71 FR 75370, Dec. 14, 2006, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 322, 30111, 30115, 30117 and 30166; delegation of authority at 49 CFR 1.95

### Amendments

[71 FR 75370, Dec. 14, 2006, as amended at 74 FR 29895, June 23, 2009]