Interpretation ID: 2902yy
Bankston & McDowell
3700 Chevron Tower
1301 McKinney
Houston, TX 77010
Dear Ms. Hunt:
This responds to your letter requesting information about test conditions in Federal motor vehicle safety standard No. 301, Fuel system integrity (49 CFR 571.301; copy enclosed). In particular, you asked whether the spare tire must be in its proper place inside a vehicle at the time of testing. You also asked whether the spare tire must be in the vehicle during other types of vehicle testing. I am pleased to have this opportunity to explain our laws and regulations for you.
Before addressing your specific question, it might be helpful to begin with some general background information. Each of this agency's safety standards specifies test conditions and procedures that this agency will use to evaluate the performance of the vehicle or equipment being tested for compliance with the particular safety standard.
In addition to the test conditions and procedures set forth in the safety standards themselves, the agency has provided guidelines to the test facilities that the agency enters into contracts with to conduct compliance tests for the agency. These guidelines are called compliance test procedures and are available through the NHTSA Technical Reference Library. The compliance test procedures are intended to provide a standardized testing and data recording format among the various contractors that perform testing on behalf of the agency, so that the test results will reflect the performance characteristics of the product being tested, not differences between the various testing facilities.
The compliance test procedures must, of course, not be inconsistent with the procedures and conditions that are set forth in the relevant safety standard. However, the compliance test procedures do, on occasion, specify procedures and conditions that go beyond what is set forth in the relevant standard. These more detailed test procedures and conditions are requirements only for the contractor test facility in conducting tests on behalf of the agency. The test procedures are subject to change and do not always directly reflect all of the requirements of the particular standard for which they are written. With that background, I will now address your specific question. A manufacturer must certify that its vehicles will comply with the requirements of Standard No. 301 when they are tested in accordance with the test conditions set forth in section S7 of the standard. This section specifies the general test conditions under Standard No. 301. However, this section does not specify whether a spare tire must be included during the testing. Accordingly, the manufacturer's certification of compliance with Standard No. 301 may be based on tests with or without the spare tire, provided that all applicable conditions in Standard No. 301 are satisfied.
You should be aware that NHTSA's compliance test procedures currently specify that if the spare tire is standard equipment, it should be inflated to the vehicle manufacturer's specifications and be in the vehicle during the agency's compliance testing (see page 27 of the "OVSC Laboratory Test Procedures," copy enclosed). Please note that, although a manufacturer is not required to include a spare tire that is standard equipment, absence of a spare tire might not provide an adequate basis for certifying that the tested vehicle complies with the requirements of Standard No. 301.
I hope this information is helpful. If you have any further questions, you should feel free to contact Marvin Shaw of my staff at this address or by telephone at (202) 366-2992.
Sincerely,
Paul Jackson Rice Chief Counsel
/Ref: 301 d:3/25/9l