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after the force is applied. The force shall be reduced to 45±5 pounds or 20±2 kilograms and the release force of the buckle or buckles measured as prescribed in § 9.8(d). A seat back retainer not connected to pelvic or upper torso restraint shall be subjected separately to a force of 2,000 pounds or 900 kilograms.

(3) After the buckle is released, the webbing shall be examined for cutting by the hardware. If the yarns are partially or completely severed in a line for a distance of 10 percent or more of the webbing width, the cut webbing shall be tested for breaking strength as specified in § 9.7(b) locating the cut in the free length between grips. If there is insufficient webbing on either side of the cut to make such a test for breaking strength, the webbing shall be repositioned in the hardware using another seat belt assembly. A tensile force shall be applied to the components as follows: Webbing in pelvic or upper torso restraint-700 pounds or 320 kilograms; webbing in seat

back retainer or webbing connecting pelvic and upper torso restraint to attachment hardware-1,500 pounds or 680 kilograms. After the force is removed, the breaking strength of the cut webbing shall be determined as prescribed above. § 9.10 Provision for changes in the standards.

Section 4 of the act provides for the possibility of changes in the standards first established pursuant to section 1 of this act. Any person, firm or organization wishing to propose a change in these standards shall submit the detailed proposal to the Director, National Bureau of Standards, U.S. Department of Commerce, Washington, D.C., 20234.

§ 9.11 Effective date.

The standards prescribed herein shall become mandatory after December 31, 1965, and until this date shall be optional alternatives to the standards published in the FEDERAL REGISTER on December 11, 1964.

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A I TO 2 INCHES OR 2.5 TO 5 CENTIMETERS

BA MINUS 0.06 INCH OR 0.15 CENTIMETER

FIGURE 1.

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SURFACE - COLD DRAWN FINISH

SIZE - 0.250 ± 0.001 INCH OR

6.35 ± 0.03 MILLIMETER

RADIUS ON EDGES -0.020 ± 0.004 INCH OR 0.5 ± 0.1 MILLIMETER

D-DRUM DIAMETER-16 INCHES OR

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G-ANGLE BETWEEN WEBBING 85 ± 2 DEGS.

FIGURE 2

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