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S7.1.2 Each helmet is impacted at four sites with two successive impacts at each site.

S6.2.2 Apply a 10-pound (4.5 kg) static vertical load through the helmet's apex.

Center the helmet laterally and seat it firmly on the reference headform according to its helmet positioning index.

S6.2.3 Maintaining the load and position described in S6.2.2, draw a line (hereinafter referred to as “test line”) on the outer surface of the helmet coinciding with portions of the intersection of that service with the following planes, as shown in Figure 2: S6.3.1 Before each test, fix the helmet on a test headform in the position that conforms to its helmet positioning index.

Secure the helmet so that it does not shift position before impact or before application of force during testing.

S7.1.3 Impact testing at each of the four sites, as specified in S7.1.2, shall start at two minutes, and be completed by four minutes, after removal of the helmet from the conditioning environment.

S7.1.4 (a) The guided free fall drop height for the helmet and test headform combination onto the hemispherical anvil shall be such that the impact speed is any speed from 16.4 ft/s to and including 17.7 ft/s (from 5.0 m/s to and including 5.4 m/s).

means a numerical value that corresponds to the diameter of an equivalent circle representing the helmet interior in inches (±0.25 inch) or to the circumference of the equivalent circle in centimeters (±0.64 centimeters).

means the distance in inches, as specified by the manufacturer, from the lowest point of the brow opening at the lateral midpoint of the helmet to the basic plane of a reference headform, when the helmet is firmly and properly positioned on the reference headform.

means a measuring device contoured to the dimensions of one of the three headforms described in Table 2 and Figures 5 through 8 with surface markings indicating the locations of the basic, mid-sagittal, and reference planes, and the centers of the external ear openings.

means a test device contoured to the dimensions of one of the three headforms described in Table 2 and Figures 5 through 8 with surface markings indicating the locations of the basic, mid-sagittal, and reference planes. The adjustable portion of the retention system test device shall not move more than 1 inch (2.5 cm) measured between preliminary and test load positions.

The brow opening of the helmet shall be at least 1 inch (2.5 cm) above all points in the basic plane that are within the angles of peripheral vision (see Figure 3).

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