Interpretation ID: nht92-9.38

DATE: January 24, 1992

FROM: Larry J. French -- President and CEO, Magnascreen

TO: Office of Chief Counsel, NHTSA

TITLE: Reference: 49 CFR, Part 571, Docket No. 91-11, Notice 2, RIN2127-AD81, Federal Motor Vehicle Safety Standards; Rearview Mirrors - Reflectance

ATTACHMT: Attached to letter dated 3/26/92 from Paul J. Rice to Larry J. French (A39; Std. 111)

TEXT:

Magnascreen is presently developing electronically controlled dimmable (day/night) rearview mirror products for motor vehicles.

Magnascreen has reviewed the revised Code of Federal Regulations, Title 49, 571.111, standard number 111, for motor vehicle rearview mirror requirements referenced above. Upon review, we are requesting that the NHTSA comment on the validity of Magnascreen's interpretation which follows:

"When a multiple reflectance level mirror is not powered by the vehicle power source, the reflectance of the mirror can be returned to a minimum of 35% reflectance (either automatically or by driver operated controls) USING AN ALTERNATE POWER SOURCE." (A power source other than the one intended to (illegible) the mirror.)

This interpretation allows multiple reflectance mirror designs to use an alternate power source to achieve the specified failsafe operation called out in CFR 49, 579.111, para. S11, Rearview Mirrors.

Your timely response will be appreciated, as this interpretation impacts Magnascreen's mirror product designs.