Interpretation ID: nht71-1.11

DATE: 03/29/71

FROM: AUTHOR UNAVAILABLE; E. T. Driver; NHTSA

TO: American Motors Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of March 12, 1971, to Mr. Lewis C. Owen of this office concerning an interpretation on your lens assembly, SF-3610703.

Federal Motor Vehicle Safety Standard No. 108 requires a minimum effective projected illuminated area for Class A turn signal lamps of 12 square inches on motor vehicles other than passenger cars and motorcycles. The subject lens assembly used in a turn signal lamp assembly with the opaque ornament does not appear to meet the 12 square inches minimum requirement. The calculations for the area, as determined by the method contained in our October 28, 1970, letter to Mr. E. W. Bernitt, were based on measurements of the ornament, because the detail dimensions were not supplied.

The backup lamp design you discussed in a telephone conversation with Mr. Owen also apparently does not meet the requirements of FMVSS No. 108. If you would like an interpretation on this backup lamp, please furnish information on the design similar to that supplied with the subject letter.