Head. 5.5.1. The head is dropped from 200 ± 1 mm onto a flat, rigid impact surface. 5.5.2. The angle between the impact surface and the midsagittal plane of the head is 35° ± 1° allowing an impact of the upper-side of the head. 5.5.3. The peak resultant head acceleration, filtered using CFC 1000, should be between 100 g and 150 g. 5.5.4. The head performance can be adjusted to meet the requirement by altering the friction characteristics of the flesh-skull interface (e.g. by lubrication with talcum powder or PTFE spray).
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Sources: Agreement Concerning the Adoption of Uniform Conditions of Approval and Reciprocal Recognition of Approval for Motor Vehicle Equipment and Parts, Agreement Concerning the Adoption of Uniform Conditions of Approval and Reciprocal Recognition of Approval for Motor Vehicle Equipment and Parts