[Code of Federal Regulations]
[Title 49, Volume 6]
[Revised as of October 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR572.18]

[Page 911]
 
                        TITLE 49--TRANSPORTATION
 
                   CHAPTER V--NATIONAL HIGHWAY TRAFFIC
                    SAFETY ADMINISTRATION, DEPARTMENT
                            OF TRANSPORTATION
 
PART 572_ANTHROPOMORPHIC TEST DEVICES--Table of Contents
 
                       Subpart C_3-Year-Old Child
 
Sec.  572.18  Thorax.

    (a) The thorax consists of the part of the torso shown in assembly 
drawing SA 103C 001 by number SA 103C 030 and conforms to each of the 
applicable drawings listed under this number on drawing SA 103C 002, 
sheets 10 and 11.
    (b) When impacted by a test probe conforming to Sec.  572.21(a) at 
13 fps in accordance with paragraph (c) of this section, the peak 
resultant accelerations at the location of the accelerometers mounted in 
the chest cavity in accordance with Sec.  572.21(c) shall be not less 
than 50g and not more than 70g. The acceleration-time curve for the test 
shall be unimodal at or above the 30g level and shall lie at or above 
the 30g level for an interval not less than 2.5 milliseconds and not 
more than 4.0 milliseconds. The lateral acceleration shall not exceed 
5g.
    (c) Test procedure. (1) With the dummy seated without back support 
on a surface as specified in Sec.  572.21(h) and oriented as specified 
in Sec.  572.21(h), adjust the dummy arms and legs until they are 
extended horizontally forward parallel to the midsagittal plane. The 
joints of the limbs are adjusted at any setting between 1g and 2g, which 
just supports the limbs' weight when the limbs are extended horizontally 
forward.
    (2) Establish the impact point at the chest midsagittal plane so 
that it is 1.5 inches below the longitudinal centerline of the bolt that 
attaches the top of the ribcage sternum to the thoracic spine box.
    (3) Adjust the dummy so that the tangent plane at the surface on the 
thorax immediately adjacent to the designated impact point is vertical 
and parallel to the face of the test probe.
    (4) Place the longitudinal centerline of the test probe to coincide 
with the designated impact point and align the test probe so that at 
impact its longitudinal centerline coincides within 2 degrees with the 
line formed by intersection of the horizontal and midsagittal planes 
passing through the designated impact point.
    (5) Impact the thorax with the test probe so that at the moment of 
impact the probe's longitudinal centerline falls within 2 degrees of a 
horizontal line in the dummy midsagittal plane.
    (6) Guide the probe during impact so that it moves with no 
significant lateral, vertical or rotational movement.
    (7) Allow a time period of at least 20 minutes between successive 
tests of the chest.