---
kind: "section"
citation: "49 C.F.R. § 572.192"
title: "49"
number: "572.192"
heading: "Head assembly."
url: "https://uscodex.org/cfr/49/572.192"
---

# §572.192. Head assembly.

- (a) The head assembly consists of the head (180-1000) and a set of three (3) accelerometers in conformance with specifications in [49 CFR 572.200(d)](/cfr/49/572.200.md?p=d) and mounted as shown in drawing 180-0000 sheet 2 of 5. When tested to the procedure specified in [paragraph (b)](#b) of this section, the head assembly shall meet performance requirements specified in [paragraph (c)](#c) of this section.
- (b) **Test procedure.** The head shall be tested according to the procedure specified in [49 CFR 572.112(a)](/cfr/49/572.112.md?p=a).
- (c) **Performance criteria.**
  - (1) When the head assembly is dropped from either the right or left lateral incline orientations in accordance with procedure in [§ 572.112(a)](/cfr/49/572.112.md?p=a), the measured peak resultant acceleration shall be between 115 g and 137 g;
  - (2) The resultant acceleration-time curve shall be unimodal to the extent that oscillations occurring after the main acceleration pulse shall not exceed 15% (zero to peak) of the main pulse;
  - (3) The longitudinal acceleration vector (anterior-posterior direction) shall not exceed 15 g.

## Notes

### 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