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Interpretation ID: aiam2641

Mr. Samuel W. Alderson, President, Humanoid Systems, 747 East 223rd Street, Carson, CA 90745; Mr. Samuel W. Alderson
President
Humanoid Systems
747 East 223rd Street
Carson
CA 90745;

Dear Mr. Alderson: This responds to your June 3, 1977, request for confirmation that 572.7(b) of Part 572, *Anthropomorphic Test Dummy* (49 CFR 572), specifies a minimum time period during which the pendulum used in testing may not reverse direction rather than an exact time.; Your interpretation is correct. The specification that the pendulu 'shall not reverse direction until T=123 ms' means that reverse travel must not occur earlier than 123 milliseconds after chordal displacement begins. The agency believes that this language can be improved and intends to clarify it at the next opportunity.; Sincerely, Joseph J. Levin, Jr., Chief Counsel