Interpretation ID: nht94-4.32

TYPE: INTERPRETATION-NHTSA

DATE: September 16, 1994

FROM: Dimitrios Kallieris -- Associate Professor and Chief Division, Experimental and Forensic Biomechanics

TO: The Director, Office of the Federal Register, National Archives and Records Administration,

TITLE: Re: Enquiry regarding 571.212 Standard No. 212, Windshield Mounting.

ATTACHMT: Attached to 2/3/95 letter from Philip R. Recht to Dimitrios Kallieris (A43; Std. 212)

TEXT: I am writing to enquire about the exact definition of parts of section S5.1 and S5.2 in 571.212 Standard No. 212, Windshield Mounting. We have undertaken 30 m.p.h. crash tests with freshly adhered windscreens to test their adherence. Two Hybrid III dumm ies were placed in the front driver and passenger positions and each was restrained by a three-point belt and air bag. We would like to know whether these test conditions are covered by section S5.1 or S5.2. Furthermore, we are not sure whether the sect ion describes tests in which windshield displacement is measured dynamically, i.e during the crash, or statically, i.e after the crash. If dynamic measurement is required, what is stipulated by the standard regarding measurement technique, e.g. accelero meters or high-speed film/video. Could you please clarify this situation for us.

Thank you for your assistance.

Yours sincerely,

Dimitrios Kallieris.