Interpretation ID: aiam1742
Metallwerk Frese GmbJ(sic)
5672 Leichlingen
Postfach 26;
Dear Sir: This is in response to your letter of September 26, 1974, requesting a interpretation of the requirement contained in S3.1.2.2 of Standard No. 111, *Rearview Mirrors*.; We interpret paragraph S3.1.2.2 as providing for three sets o test-force directions. The requirement that a mirror in the head impact area deflect or collapse or break away without leaving sharp edges when impacted in a forward direction means that the 90 pounds of force is to be applied in a forward direction in a vertical longitudinal plane, from 45 degrees above to 45 degrees below the horizontal. (See side view sketch). The requirements that the same performance level be met when the mirror is impacted from the sidewall direction creates two additional sets of test-force directions, leftward and rightward in a vertical plane perpendicular to the vertical longitudinal plane. As in the forward impact portion of the requirement, the force must be applied from 45 degrees above to 45 degrees below the horizontal. (See front view sketch).; Yours truly, Richard B. Dyson, Acting Chief Counsel