Interpretation ID: 1984-1.46

TYPE: INTERPRETATION-NHTSA

DATE: 05/03/84

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: U.S. Postal Service

TITLE: FMVSS INTERPRETATION

TEXT:

May 3, 1984

Mr. Joel S. Premack Research and Development Laboratories U.S. Postal Service Rockville, MD 20852-8101

Dear Mr. Premack:

This responds to your March 7, 1984 letter to Roger Fairchild of this office regarding Federal Motor Vehicle Safety Standard (FMVSS) 111, Rearview Mirrors. In particular, you asked whether the covering of the rear and rear-side windows on Postal Service Vehicles would be consistent with the requirements of FMVSS 111.

FMVSS 111 (copy enclosed) establishes requirements regarding rearview mirror systems on new motor vehicles. New Postal Service vehicles would be required to employ one of three optional mirror systems. The first system is a system permitted for use on passenger cars, and includes an inside review mirror with a specified field of view and a plane, driver's side exterior mirror also having a specified field of view. The second permissible system is also a passenger car system and is identical to the first system, except that the inside mirror need not provide the specified field of view and an additional passenger side plane or convex rearview mirror must be provided to compensate for the more restricted field of view of the inside mirror. The third system has two plane mirrors of 19.5 square inches reflective surface area each, one mounted on each side of the vehicle.

Based on the materials you provided with your letter, it appears that Postal Service DJ-5G Models employ the second system described above. In that case, further reduction of the field of view of the inside rearview mirror would not affect compliance with our standard, since an additional passenger side mirror is provided.

If the proposed covering of the rear windows is to be accomplished as a modification to vehicles already delivered to the Postal Service, these modifications may not be subject to FMVSS 111 at all. Modifications to vehicles must be consistent with safety standards only to the extent those modifications are performed by a vehicle manufacturer, distributor, dealer, or private motor vehicle repair business which knowingly renders inoperative safety equipment installed on the vehicle. See 15 U.S.C. 1397(a)(2)(A). Thus, if the window covering is done by the Postal Service itself, FMVSS requirements are not applicable.

If you have any further questions on this matter, please feel free to contact us.

Sincerely,

Frank Berndt Chief Counsel

Enclosure

March 7, 1984

Mr. Roger Fairchild National Highway Traffic Safety Administration U.S. Department of Transportation 400 Seventh Street, S.W. Washington, DC 20590

Dear Mr. Fairchild:

The Engineering Support Center of the U.S. Postal Service has been requested to consider covering over windows identified as items 1, 2, and 3 in the enclosed figure. A set of mirrors would be installed to minimize the impact on rear and side viewing. He are interested in knowing whether such a retrofit is consistent with the existing vehicle certification.

We would appreciate your review of the proposed change in window area as it pertains to Federal Motor Vehicle Safety Standard 111 and related effectiveness of the rear viewing mirrors. Please contact Mr. Joel Premack on 443-3257 with your assessment of this issue.

Joel S. Premack Mechanical Engineer, Program Engineer Mechanical Design/Development Branch Engineering Support Center 11711 Parklawn Drive Rockville, MD 20852-8101

Enclosure

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AM General Corporation MODEL KJ-5G