Skip to main content
Find a Lawyer

Code of Federal Regulations Title 49. Transportation § 49.572.132 Head assembly and test procedure

Current as of October 02, 2022 | Updated by FindLaw Staff

(a) The head assembly (refer to § 572.130(a)(1)(i)) for this test consists of the complete head (drawing 880105–100X), a six-axis neck transducer (drawing SA572–S11) or its structural replacement (drawing 78051–383X), and 3 accelerometers (drawing SA572–S4).

(b) When the head assembly is dropped from a height of 376.0±1.0 mm (14.8±0.04 in) in accordance with subsection (c) of this section, the peak resultant acceleration at the location of the accelerometers at the head CG may not be less than 250 G or more than 300 G. The resultant acceleration vs. time history curve shall be unimodal;  oscillations occurring after the main pulse must be less than 10 percent of the peak resultant acceleration. The lateral acceleration shall not exceed 15 G (zero to peak).

(c) Head test procedure. The test procedure for the head is as follows:

(1) Soak the head assembly in a controlled environment at any temperature between 18.9 and 25.6 °C (66 and 78 °F) and a relative humidity from 10 to 70 percent for at least four hours prior to a test.

(2) Prior to the test, clean the impact surface of the skin and the impact plate surface with isopropyl alcohol, trichloroethane, or an equivalent. The skin of the head must be clean and dry for testing.

(3) Suspend and orient the head assembly as shown in Figure 19 of 49 CFR 572. The lowest point on the forehead must be 376.0±1.0 mm (14.8±0.04 in) from the impact surface. The 1.57 mm (0.062 in) diameter holes located on either side of the dummy's head shall be used to ensure that the head is level with respect to the impact surface.

(4) Drop the head assembly from the specified height by means that ensure a smooth, instant release onto a rigidly supported flat horizontal steel plate which is 50.8 mm (2.0 in) thick and 610 mm (24.0 in) square. The impact surface shall be clean, dry and have a micro finish of not less than 203.2.x10−6 mm (8 micro inches) (RMS) and not more than 2032.0x10−6 mm (80 micro inches) (RMS).

(5) Allow at least 2 hours between successive tests on the same head.

Back to chapter list
Previous part of code Next part of code
Back to chapter list

Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.572.132 Head assembly and test procedure - last updated October 02, 2022 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-572-132/

Read this complete Code of Federal Regulations Title 49. Transportation § 49.572.132 Head assembly and test procedure on Westlaw

FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature or via Westlaw before relying on it for your legal needs.

Was this helpful?

Search all Codes

Welcome to FindLaw's Cases & Codes

A free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw's Learn About the Law.

Go to Learn About the Law

Latest Blog Posts

For Legal Professionals

Learn About the Law

Get help with your legal needs

FindLaw’s Learn About the Law features thousands of informational articles to help you understand your options. And if you’re ready to hire an attorney, find one in your area who can help.

Go to Learn About the Law

Need to find an attorney?

Search our directory by legal issue

Enter information in one or both fields (Required)

    More Options
    Copied to clipboard