[Code of Federal Regulations]
[Title 49, Volume 5]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR572.73]

[Page 803-804]
 
                        TITLE 49--TRANSPORTATION
 
                            OF TRANSPORTATION
 
PART 572--ANTHROPOMORPHIC TEST DEVICES--Table of Contents
 
                       Subpart I--6-Year-Old Child
 
Sec. 572.73  Neck assembly and test procedure.

    (a) Neck assembly. The neck consists of the assembly designated as 
SA 106C 020 on drawing SA 106C 001, sheet 2, and conforms to each 
drawing listed on SA 106C 001, sheet 9.
    (b) Neck assembly impact response requirements. When the head-neck 
assembly (SA 106C 010 and SA 106C 020) is tested according to the test 
procedure in Sec. 572.73(c), the head:
    (1) Shall rotate, while translating in the direction of the pendulum 
preimpact flight, in reference to the pendulum's longitudinal center 
line a total of 78 degrees6 degrees about the head's center 
of gravity; and
    (2) Shall rotate to the extent specified in Table B at each 
indicated point in time, measured from time of impact, with the chordal 
displacement measured at the head's center of gravity.
    (i) Chordal displacement at time ``T'' is defined as the straight 
line distance between the position relative to the pendulum arm of the 
head's center of gravity at time ``zero;'' and the position relative to 
the pendulum arm of the head's center of gravity at time T as 
illustrated by Figure 3 in Sec. 572.11.
    (ii) The peak resultant acceleration recorded at the location of the 
accelerometers mounted in the headform according to Sec. 572.77(b) shall 
not exceed 30g.

                                                     Table B
----------------------------------------------------------------------------------------------------------------
                                                                    Time (ms)(2+.08T)       (inches)0.8
----------------------------------------------------------------------------------------------------------------
0............................................................                    0                         0
30...........................................................                   26                       2.7
60...........................................................                   44                       4.3
Maximum......................................................                   68                       5.8
60...........................................................                  101                       4.4
30...........................................................                  121                       2.4
0............................................................                  140                         0
----------------------------------------------------------------------------------------------------------------

    (3) The pendulum shall not reverse direction until the head's center 
of gravity returns to the original ``zero'' time position relative to 
the pendulum arm.
    (c) Neck test procedure. The test procedure for the neck is as 
follows:
    (1) Mount the head and neck assembly on a rigid pendulum as 
specified in Sec. 572.21, Figure 15, so that the head's midsagittal 
plane is vertical and coincides with the plane of motion of the 
pendulum's longitudinal center line. Attach the neck directly to the 
pendulum as shown in Sec. 572.21, Figure 15.
    (2) Release the pendulum and allow it to fall freely from a height 
such that the velocity at impact is 17.001.0 fps,

[[Page 804]]

measured at the center of the accelerometer specified in Sec. 572.21, 
Figure 15.
    (3) Decelerate the pendulum to a stop with an acceleration-time 
pulse described as follows:
    (i) Establish 5g and 20g levels on the a-t curve.
    (ii) Establish t1 at the point where the rising a-t curve 
first crosses the 5g level; t2 at the point where the rising 
a-t curve first crosses the 20g level; t3 at the point where 
the decaying a-t curve last crosses the 20g level; and t4 at 
the point where the decaying a-t curve first crosses the 5g level.
    (iii) t2-t1 shall not be more than 3 
milliseconds.
    (iv) t3-t2 shall not be more than 22 
milliseconds, and not less than 19 milliseconds.
    (v) t4-t3 shall not be more than 6 
milliseconds.
    (vi) The average deceleration between t2 and 
t3 shall not be more than 26g, or less than 22g.
    (4) Allow the neck to flex without the head or neck contacting any 
object other than the pendulum arm.
    (5) Allow at least 60 minutes between successive tests.

[56 FR 57836, Nov. 14, 1991, as amended at 57 FR 4086, Feb. 3, 1992]