Interpretation ID: 86-4.44

TYPE: INTERPRETATION-NHTSA

DATE: 08/18/86

FROM: AUTHOR UNAVAILABLE; Erika Z. Jones; NHTSA

TO: Wayne D. Buhler -- Director of Engineering, Onspot, Inc.

TITLE: FMVSS INTERPRETATION

TEXT:

Mr. Wayne D. Buhler Director of Engineering Onspot, Inc. 1424 E. 800 N. Orem, UT 84057

Dear Mr. Buhler:

This responds to your letter requesting a review of your "Onspot Safety Chain," an automatic snowchain, for compliance with existing regulations. according to your letter, the current units are being installed both as original equipment and in the aftermarket on 1/2 ton and larger vehicles, although prototypes are being developed for passenger cars. The device is activated by pulling a dash mounted electrical switch which activates an electric solenoid valve, allowing air to pass from an air tank or the Onspot air chambers. For the future, you are considering using a push pull air switch mounted at the dash which would get air supply from the tank or a manifold, thus eliminating the solenoid valve. On vehicles with air-mechanical brakes, air is generally used from the secondary air reservoir, or the primary reservoir if that is all that is available. On vehicles with hydraulic brakes, an auxiliary air system is provided. I regret the delay in responding to your letter.

By way of background information, the National Highway Traffic Safety Administration (NHTSA) does not provide approvals of motor vehicles or motor vehicle equipment. Under the National Traffic and Motor Vehicle Safety Act, it is the responsibility of the manufacturer to ensure that its vehicles or equipment comply with applicable safety standards. The following represents our opinion based on the facts provided in your letter.

NHTSA does not have any regulations covering automatic snowchains. However, it is possible that installation of the Onspot Safety Chain could affect a vehicle's compliance with other safety standards. We note in particular that since the device may be tied into a vehicle's air brake system, it could affect a vehicle's compliance with Federal Motor Vehicle Safety Standard No. 121, Air Brake Systems.

If your device is installed as original equipment on a new vehicle, the vehicle manufacturer is required to certify that, with the device installed, the vehicle satisfies the requirements of all applicable safety standards. If the device is added to a previously certified new motor vehicle prior to its first sale, the person who modifies the vehicle would be an alterer of a previously certified motor vehicle and would be required to certify that, as altered, the vehicle continues to comply with all of the safety standards affected by the alteration.

If the device is installed on a used vehicle by a business such as a garage, the installer would not be required to attach a certification label. However, it would have to make sure that it did not knowingly render inoperative the compliance of the vehicle with any safety standard. This is required by section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act.

Enclosed is an information sheet which identifies relevant Federal statutes and NHTSA standards and regulations affecting motor vehicle and motor vehicle equipment manufacturers. I note that the Vehicle Safety Act's provisions requiring manufacturers to notify purchasers of safety-related defects and to remedy such defects without charge apply regardless of whether an item of motor vehicle equipment is covered by a safety standard.

Sincerely,

Erika Z. Jones Chief Counsel

Enclosure

Erika Jones March 24, 1986 Chief Council N.H.T.S.A. Washington, DC 20590

Ms. Jones:

I am writing to officially request a review of our product for compliance with existing codes. Enclosed is a copy of our patents and a description of the installation of the product. This should prove helpful in your evaluation.

The Onspot Safety Chain is relatively new to the United States as it has only been marketed since 1984. The product is currently being imported from Sweden, where it was invented. There are approximately 10,000 units in operation worldwide with 1000 of these in operation in the U.S. Customers include the U.S. Postal Service and the U.S.A.F.

The current units have been installed on 1/2 ton and larger vehicles, though prototypes are being developed for passenger cars. Installations are made both at the O.E.M. level and the aftermarket.

Onspot safety chains have been approved in the National Standards for School Bus Body on May 22, 1985. California Senate bill No. 2186 also allows the chains is equivalent to a single set of standard chains. The state of Washington granted a certificate of approval for the device in 1981. This approval has been transferred to our company since November 25, 1984. You will find copies of these approvals enclosed.

Currently the device is activated by pulling a dash mounted electrical switch which activates an electric solenoid valve, allowing air to pass from in air tank to the Onspot air chambers. In the future we may use a push pull air switch mounted at the dash which would get air supply from the tank or a manifold, thus eliminating the solenoid valve (see Figure 1).

On vehicles with air-mechanical brakes, it is common to use air from the secondary air reservoir, or primary if that is all that is available. On vehicles with hydraulic brakes we provide an auxiliary air system which consists of a Delco compressor, an air reservoir, and a limit switch to keep the pressure between 85 and 110 psi (See Figure 2).

As can be seen from the drawings, the device is pneumatically actuated, and then powered by the tire of the vehicle. As the velocity of the vehicle increases the angular velocity of the chainwheel increases. The device is not warrantied if engaged above 25 mph, and when engaged the top speed of operation is 45 mph. The chains may be disengaged at any speed within the operating envelope. Please note the Operating Instructions and Recommendations enclosed.

Also enclosed is a summary of test results which have been selected from several independent tests on the product. These tests will be available for your review at your request. Please call me If you have any questions or for additional material.

Sincerely,

Wayne D. Buhler Director of Engineering Onspot, Inc.

cc: Dr. Carl Clark Inventor Contaxct code NRD-12

Enclosures Omitted.