Interpretation ID: nht73-2.23

DATE: 03/26/73

FROM: Francis Armstrong; Francis Armstrong; Office of Standards Enforcement

TO: File

TITLE: FMVSS Interpretation

TEXT:

March 26, 1973 Close-out of Investigatory File, CIR 584 N41-21RGa; CIR 584 Director, Office of Standards Enforcement File The Investigatory File, CIR 584, has been closed out inasmuch as the manufacturer utilitzed a driver test dummy during his certification tests. This alternate certification technique is permissible by FMVSS No. 204. A maximum rearward dynamic horizontal displacement of 5.1 inches was obtained on the standards enforcement Checker test vehicle, NHTSA No. 71518, during a 29.3 mph frontal barrier impact. This maximum displacement was only 0.1 inch greater than the maximum allowable and which occurred late (124 msec.) during the collision interval. The manufacturer's submitted data indicated that their test dummy impacted the steering control early (approximately 55 msec.) in the vehicle impact phase and thereby would restrict the steering control rearward displacement. It is therefore, concluded that the NHTSA vehicle would have met the performance requirements of FMVSS No. 204 if the alternate driver dummy technique had been utilized in the test. Francis Armstrong