NHTSA Interpretation File Search
Overview
NHTSA's Chief Counsel interprets the statutes that the agency administers and the standards and regulations that it issues. Members of the public may submit requests for interpretation, and the Chief Counsel will respond with a letter of interpretation. These interpretation letters look at the particular facts presented in the question and explain the agency’s opinion on how the law applies given those facts. These letters of interpretation are guidance documents. They do not have the force and effect of law and are not meant to bind the public in any way. They are intended only to provide information to the public regarding existing requirements under the law or agency policies.
Understanding NHTSA’s Online Interpretation Files
NHTSA makes its letters of interpretation available to the public on this webpage.
An interpretation letter represents the opinion of the Chief Counsel based on the facts of individual cases at the time the letter was written. While these letters may be helpful in determining how the agency might answer a question that another person has if that question is similar to a previously considered question, do not assume that a prior interpretation will necessarily apply to your situation.
- Your facts may be sufficiently different from those presented in prior interpretations, such that the agency's answer to you might be different from the answer in the prior interpretation letter;
- Your situation may be completely new to the agency and not addressed in an existing interpretation letter;
- The agency's safety standards or regulations may have changed since the prior interpretation letter was written so that the agency's prior interpretation no longer applies; or
- Some combination of the above, or other, factors.
Searching NHTSA’s Online Interpretation Files
Before beginning a search, it’s important to understand how this online search works. Below we provide some examples of searches you can run. In some cases, the search results may include words similar to what you searched because it utilizes a fuzzy search algorithm.
Single word search
Example: car
Result: Any document containing that word.
Multiple word search
Example: car seat requirements
Result: Any document containing any of these words.
Connector word search
Example: car AND seat AND requirements
Result: Any document containing all of these words.
Note: Search operators such as AND or OR must be in all capital letters.
Phrase in double quotes
Example: "headlamp function"
Result: Any document with that phrase.
Conjunctive search
Example: functionally AND minima
Result: Any document with both of those words.
Wildcard
Example: headl*
Result: Any document with a word beginning with those letters (e.g., headlamp, headlight, headlamps).
Example: no*compl*
Result: Any document beginning with the letters “no” followed by the letters “compl” (e.g., noncompliance, non-complying).
Not
Example: headlamp NOT crash
Result: Any document containing the word “headlamp” and not the word “crash.”
Complex searches
You can combine search operators to write more targeted searches.
Note: The database does not currently support phrase searches with wildcards (e.g., “make* inoperative”).
Example: Headl* AND (supplement* OR auxiliary OR impair*)
Result: Any document containing words that are variants of “headlamp” (headlamp, headlights, etc.) and also containing a variant of “supplement” (supplement, supplemental, etc.) or “impair” (impair, impairment, etc.) or the word “auxiliary.”
Search Tool
NHTSA's Interpretation Files Search
| Interpretations | Date |
|---|---|
ID: 18464.ztvOpenMr. Ralf Wohl Dear Mr. Wohl: This is in reply to your fax of July 29, 1998, to Taylor Vinson of this Office with respect to your electric motorcycle. Your first question is whether Federal Motor Vehicle Safety Standard (FMVSS) No. 123 Motorcycle Controls and Displays requires a motorcycle to be equipped with a supplemental engine stop control. The answer is yes; as you have noted, S5.1 states that "Each motorcycle shall be equipped with a supplemental engine stop control, located and operable as specified in Table 1" (our emphasis). You have also asked whether the operation of your control, as you have described it, "is adequate for this purpose." As you have also noted, "Operation - Column 3" of Table 1 is blank. This means that Standard No. 123 does not specify how the supplemental engine stop control shall be operated. This choice is left to the manufacturer but obviously it must be a control that provides an alternative means of stopping the engine. On your electric motorcycle, the primary stop control is the twist grip handlebar on which the throttle is returned to the off position. If the throttle sticks in the open position, the propulsion system may also be overriden and deactivated by application of the brakes. We view this as a "supplemental engine stop control" within the general meaning of the term. You also tell us of your wish to manufacture motorcycles for a limited time using "an off the shelf 28V military headlamp that does not meet all the photometric requirements for a motorcycle per FMVSS 571.108," and ask whether a waiver is possible. I enclose a copy of our regulations (49 CFR Part 555) under which manufacturers of motor vehicles, including motorcycles, may apply for temporary exemptions from one or more of the Federal motor vehicle safety standards. However, this process takes from three to four months because of the necessity to publish a notice in the Federal Register asking for comments on the application. This may not be responsive to your situation since it is possible that your technical difficulties will be solved by then. Other than Part 555, we have no authority to grant a waiver from compliance with Federal Motor Vehicle Safety Standard No. 108. If you have any questions, you may call Mr. Vinson (202-366-5263). Sincerely, |
1998 |
ID: nht90-3.21OpenTYPE: Interpretation-NHTSA DATE: July 18, 1990 FROM: Paul Jackson Rice -- Chief Counsel, NHTSA TO: Michael O'Donnell TITLE: None ATTACHMT: Letter dated 4-18-90 to Chief Counsel's Office, NHTSA from Michael O'Donnell; (OCC 4690) TEXT: This is in response to your letter to this office asking whether NHTSA's safety standards apply to vehicles in service on the public roads. Specifically, you were interested in the applicability of NHTSA requirements to a 1977 school bus that was convert ed to a "recreational vehicle/house coach" that is now only for personal and family use. The Federal Motor Vehicle Safety Standards (FMVSS) promulgated by this agency apply to the manufacture and sale of new motor vehicles and new items of motor vehicle equipment. The requirement that a motor vehicle or item of motor vehicle equipment compl y with all applicable FMVSS applies only until the product is first sold to a consumer. Both before and after a vehicle or item of equipment is first sold to a consumer, any modifications to that product are affected by section 108(a)(2)(A) of the Natio nal Traffic and Motor Vehicle Safety Act (15 U.S.C. 1397(a)(2)(A), which states: No manufacturer, distributor, dealer or motor vehicle repair business shall knowingly render inoperative, in whole or in part, any device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in co mpliance with an applicable Federal motor vehicle safety standard . . . . If any of the commercial entities identified in section 108(a)(2)(A) were to make modifications that resulted in a "render inoperative" violation, the violating commercial entity would be liable for a civil penalty of up to $1,000 for each violation. Pl ease note that this "render inoperative" provision does not apply to a vehicle owner. The vehicle owner may modify his or her vehicle without violating any Federal requirements, irrespective of whether the modification affects the vehicle's compliance w ith a safety standard. Please note also that the individual States have the authority to regulate the operation and use of motor vehicles within their borders. Additionally, the individual States have the authority to regulate the modifications that may be made to a vehicle by its owner. You may wish to contact the Department of Motor Vehicles for the State of New York to learn if the State has established any requirements applicable to your use or registration of this vehicle in New York. I hope you have found this information helpful. |
|
ID: 2619yOpen Mr. Michael O'Donnell Dear Mr. O'Donnell: This is in response to your letter to this office asking whether NHTSA's safety standards apply to vehicles in service on the public roads. Specifically, you were interested in the applicability of NHTSA requirements to a 1977 school bus that was converted to a "recreational vehicle/house coach" that is now only for personal and family use. The Federal Motor Vehicle Safety Standards (FMVSS) promulgated by this agency apply to the manufacture and sale of new motor vehicles and new items of motor vehicle equipment. The requirement that a motor vehicle or item of motor vehicle equipment comply with all applicable FMVSS applies only until the product is first sold to a consumer. Both before and after a vehicle or item of equipment is first sold to a consumer, any modifications to that product are affected by section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1397(a)(2)(A), which states: No manufacturer, distributor, dealer or motor vehicle repair business shall knowingly render inoperative, in whole or in part, any device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in compliance with an applicable Federal motor vehicle safety standard . . . . If any of the commercial entities identified in section 108(a)(2)(A) were to make modifications that resulted in a "render inoperative" violation, the violating commercial entity would be liable for a civil penalty of up to $1,000 for each violation. Please note that this "render inoperative" provision does not apply to a vehicle owner. The vehicle owner may modify his or her vehicle without violating any Federal requirements, irrespective of whether the modification affects the vehicle's compliance with a safety standard. Please note also that the individual States have the authority to regulate the operation and use of motor vehicles within their borders. Additionally, the individual States have the authority to regulate the modifications that may be made to a vehicle by its owner. You may wish to contact the Department of Motor Vehicles for the State of New York to learn if the State has established any requirements applicable to your use or registration of this vehicle in New York. I hope you have found this information helpful. Sincerely,
Paul Jackson Rice Chief Counsel /ref: VSA d:7/l8/90 |
1970 |
ID: nht88-1.64OpenTYPE: INTERPRETATION-NHTSA DATE: 03/07/88 FROM: AUTHOR UNAVAILABLE; Erika Z. Jones; NHTSA TO: Robert L. Bernard TITLE: FMVSS INTERPRETATION TEXT: Robert L. Bernard Attorney at Law 12342 Wrenthrope Drive Houston, TX 77031 Dear Mr. Bernard: This letter responds to your inquiry of August 21, 1987, where you asked for this agency's opinion on whether Federal motor vehicle safety standard 115 (49 CFR S571.115) requires a manufacturer's chrome script name on the trunk of vehicles it manufacture s. It does not. Standard 115, Vehicle Identification Number- Basic Requirements, directs a vehicle manufacturer to place a discrete vehicle identification number (VIN) on each vehicle it manufactures. Under paragraph S4.5, the VIN for any motor vehicle must appear indel ibly on a Dart of the vehicle other than the glazing, that is not designed to be removed except for repair. Paragraph S4.6 states that the VIN for passenger cars must appear inside the passenger compartment. Title 49 CFR Part 565, VIN-Content Requirement s, states that among other things, the VIN's first three characters must identify the vehicle manufacturer. However, neither Standard 115 or 565 require a manufacturer's name plate to appear on the vehicle. I hope you find this information helpful. Sincerely, Erika Z. Jones Chief of Counsel
Erika Z. Jones Chief Counsel N.H.T.S.A. 400 7th Street, S.W. Washington, D.C. 20590 Re: FMVSS-115 I have purchased a AC Mark IV motor vehicle manufactured by Autokraft in England which complies with all D.O.T. and E.P.A. rules and regulations and is imported and sold through Ford Motor Company franchised dealers with Ford warranty. Enclosed please find a copy from the company brochure. I have requested the deletion of the chrome script name "Autokraft" from the trunk from the manufacturer. I request your opinion that the above standard and regulation does not require the chrome script name "Autokraft" on the trunk because there is the name and data plate affixed to the body in the engine compartment. I have discussed this matter with Joan Tilghman and she requested that I write to you. Please advise. Very truly yours, Robert L. Bernard RLB/kmr/ed cc: Joan Tilghman |
|
ID: nht74-2.9OpenDATE: 03/19/74 FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA TO: American Snowblast Corporation TITLE: FMVSS INTERPRETATION TEXT: This responds to your March 4, 1974, question whether your rotary snowplows, constructed with four-wheel drive and four-wheel steer and a top speed of 35 miles per hour, must be certified to conform to Federal motor vehicle safety standards. You also asked whether "certified brakes" will be sufficient certification to Standard 121, what the effects of a locked transfer case are on an anti-lock system, and what procedure exists to petition for an exemption from the standard. I have enclosed an information sheet which explains that the vehicles you build for highway use are motor vehicles subject to the standard. The standard applies to the performance of the vehicle as a whole, not just to the brake system. In the event that the vehicles as completed do not actually comply, it is the manufacturer of the vehicle who is responsible. I have enclosed a copy of the law and regulations explaining the basis for and necessary procedures to apply for a temporary exemption from our safety standards. With regard to a locked transfer case, S6.1.11 of the air brake standard requires: S6.1.11 Special drive conditions. A vehicle equipped with an interlocking axle system or a front wheel drive system that is engaged and disengaged by the driver is tested with the system disengaged. Yours truly, ATTACH. March 4, 1974 Department of Transportation - NHTSA Attention: Sid Williams Gentlemen: Please give us your opinion on where we stand with respect to FMVSS-121. We build large rotary snowplows (brochure enclosed) which are sold primarily to airports. We do build an average of five or so per year for highway plowing, and this is our area of concern. These machines are air braked, four wheel drive and four wheel steer, have a top speed of 35 m.p.h., and weigh less than 40,000 lbs. but more than 30,000 lbs. Our questions are: must we certify; will certified brakes be sufficient to certify the vehicle; what are the effects of a locked transfer case on anti-lock; the procedure for petitioning for an exemption, etc. Sincerely AMERICAN SNOWBLAST CORPORATION; D. L. Massy -- Chief Engineer Enclosure Omitted. |
|
ID: nht75-1.22OpenDATE: 09/11/75 FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA TO: American Trailers, Inc. TITLE: FMVSS INTERPRETATION TEXT: This responds to your letter of August 12, 1975, concerning the application of Federal Motor Vehicle Safety Standard No. 106-74, Brake Hoses, to an anchor coupling. You enclosed a diagram depicting the installation of two of these couplings, and suggested that they are not subject to the labeling requirements of the standard. This interpretation is correct. "Brake hose end fitting" is defined in Standard No. 106-74 as: a coupler, other than a clamp, designed for attachment to the end of a brake hose. The anchor couplings which you have described are attached to the ends of completed brake hose assemblies, rather than to the ends of brake hoses. Therefore, they are not "brake hose end fittings" subject to the standard's requirements. It appears from your letter that you might not consider the nylon tubing to be "brake hose." If the nylon tubing is flexible, however, such an interpretation would be incorrect. "Brake hose" is defined in the standard as: a flexible conduit manufactured for use in a brake system to transmit or contain the fluid pressure or vacuum used to apply force to a vehicle's brakes. Thus flexible chassis plumbing and other flexible conduits, in addition to rubber brake hoses, are subject to the standard's requirements. Sincerely, ATTACH. American Trailers, Inc. August 12, 1975 National Highway Traffic Safety Admin. To - Docket 1 - 5, Brake Hoses Gentlemen: SUBJECT: Anchor Couplings In a sliding suspension condition we use an anchor coupling fitting to join the nylon tubing assembly to the rubber air hose assembly. See the attached sketch. Our question is, whether or not the anchor coupling must meet the labeling requirements of FMVSS-106? Fitting manufacturers to-date have indicated that labeling is not required at this point since the coupling is not part of the air hose assembly. Your earliest reply would be appreciated. Sincerely, Jerry W. McNeil Director Of Engineering cc: D. Wieriman; TTMA (Graphics omitted) AMERICAN TRAILERS, INC. OKLAHOMA CITY, OKLA. Name ANCHOR COUPLING LOCATION Drawn By: McBay Date: 8-11-75 Drawing No. 1-32-0006 |
|
ID: nht72-4.22OpenDATE: 03/17/72 FROM: AUTHOR UNAVAILABLE; Francis Armstrong; NHTSA TO: Electrical Testing Laboratories, Inc. TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter dated January 19, 1972, to Mr. Eugene Laskin, regarding questions you have reisting to interpretations of demonstration procedure descriptions contained in paragraphs 5.2j and 5.2k of Federal Motor Vehicle Safety Standard (FMVSS) No. 209. The answers to your questions are as follows: 1. Paragraph S5.2j - The phrase "within a period of 50 milliseconds" refers to the rise time of the acceleration only with the webbing movement measured from start of acceleration to lockup. The movement occurring after lockup due to natural webbing elongation and webbing compaction around the retractor spool is not measured. Webbing movement exclusive of the above-mentioned compaction and elongation can be measured by using a rotary of linear potentimeter reading out on a dual channel oscilloscope or oscillograph along with the readout of the time vs acceleration trace. 2. Paragraph s5.2k - The present standard does not specify any particular sequence for performing the 10,000 lockup cycles on emergency locking retractors as part of the total 50,000 cycles. This office presently has two laboratories performing the compliance tests in the following manner. Laboratory A - One lockup cycle out of every five using the commercial Carlson cycling apparatus. Laboratory B - 40,000 cycles of extension and retraction followed by 10,000 lockup cycles. 3. The methods presently employed by our test laboratories in actuating the lockup mechanism is to accelerate the retractor by means of compressed air, thus effecting the lockup. This method of lockup is employed by our laboratories because a retractor that is sensitive both to vehicle acceleration and tilting would most frequently be locked by acceleration when installed in a vehicle. This is not to say that you are compelled to cycle your retractors by accelerating them. If the locking mechanism is the name for both modes (e.g. a (Illegible Word)), it may make little difference whether the retractors are accelerated or tilted. However, if our test disclose a cycling failure, you will be obliged to show that your method was, in fact, equivalent to ours. Should you require any further details or information regarding the test procedure for emergency locking retractors, please contact Mr. R. Jasinski of this office. Thank you for your interest in auto safety. |
|
ID: nht92-5.6OpenDATE: July 29, 1992 FROM: Kevin R. Boyne -- Chief Engineer, Dynamics and Durability Engineering, Transportation Research Center Inc. TO: Paul Jackson Rice -- Office of Chief Council TITLE: None ATTACHMT: Attached to letter dated 10/21/92 from Paul Jackson Rice to Kevin R. Boyne (A40; Std. 114) TEXT: This correspondence is a request for clarification of CFR Title 49, Part 571.114, Section 4.2.1 (FMVSS 114, "Theft Protection"). The Transportation Research Center Inc. (TRC) is conducting FMVSS certification tests on a passenger car for compliance, beginning September 1, 1992. The test vehicle is equipped with an automatic transmission and a console-mounted shift lever. There is no provision for an override device for the removal of the ignition key. Section 4.2.1 requires each vehicle which has an automatic transmission with a "park" position to prevent removal of the key, unless the transmission shift lever is locked in "park" or becomes locked in "park" as the direct result of removing the key. The vehicle we are testing operates in the following manner: Initial Condition - Engine running and shift lever positioned in "drive". Action - The operator depresses the thumb button on the left side of the shift lever and moves the shift lever to the "park" position. Point of Concern - As long as the thumb button is held in the depressed position, the ignition key can be rotated to the lock position and removed. Still holding the thumb button, the shift lever can later be moved to any position. Removal of the key will only occur in the "park" position. Is this condition within the requirements of the standard? The solenoid which prevents the moving of the key from the accessory to lock position, and subsequent key removal, is deactivated by the position of the shift lever. Additionally, the shift lever will only lock in "park" if the thumb button is released. TRC has inspected other vehicles of similar layout for this condition and found it to exist in all three foreign-designed vehicles we tested. The one domestic-designed vehicle we inspected required release of the thumb button to permit rotation of the key to the lock position and subsequent removal. Please provide TRC in writing, regarding the Chief Council's position. If you have any questions or require further information before you can determine a position, please contact the undersigned at (513) 666-2011. We thank you in advance for your expeditious reply. |
|
ID: nht74-2.28OpenDATE: 01/23/74 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Dow Chemical Europe, S.A. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of January 10, 1974, concerning motor vehicle brake fluid certification. The answer to your first two questions is no. The answer to your third question is also no, since the report of the independent testing laboratory covers only the fluid actually tested and bears no necessary relationship to a manufacturer's quality control program and the necessity to assure continuing compliance with Standard No. 116. The answer to the fourth question is yes - the manufacturer must satisfy himself of continuing compliance and, when necessary, provide data to the NHTSA in substantiation of his certification. Yours truly, ATTACH. DOW CHEMICAL EUROPE S.A. The Director -- National Highway Traffic Safety Administration, U.S. Department of Transportation, Ref: MOTOR VEHICLE BRAKE FLUID CERTIFICATION Dear Sir, I am writing to you for clarification on a point which is, alas, still causing some confusion here in Europe. As you can see from the attachment, I wrote to the SAE in 1969 and my letter to them was forwarded to Dr. Robert Brenner for the DOT position. Unfortunately I never received a reply. May I therefore repeat my enquiry: 1. Does the DOT/NHTSA issue certificates of compliance of brake fluid with the current Federal Regulations (FMVSS116, March 1972)? assuming not: 2. Does the DOT/NHTSA officially recognise certain laboratories as being capable of testing to the requirements of the current Federal Regulations? assuming not: 3. Is the DOT/NHTSA satisfied when the manufacturer of brake fluid obtains a test certificate from an independent testing laboratory, showing compliance of its product with current Federal Regulations? assuming not: 4. Does the DOT/NHTSA simply place the onus on the manufacturer to satisfy himself and, when necessary, to prove that his product complies with current Federal regulations? Furthermore, I should appreciate guidance on the following: Previous to the issuance of Federal Regulations, most of the individual States had their own regulations pertaining to brake fluid. After the issuance of Federal Regulations, can it be assumed that no State Authority may take action against a supplier/manufacturer/trader of brake fluid not complying with that particular State's regulations, but complying fully with the Federal regulations? In other words, may a State legally enforce requirements which are different, more stringent etc. than the Federal regulations? I should like to thank you in advance for your trouble and look forward to your reply. Yours sincerely, J. G. Abbott -- Transportation Chemicals Technical Service & Development Society of Automotive Engineers, Inc. December 23, 1969 J. G. Abbott -- Transportation Chemicals Development and Services, Dow Chemical Europe S.A. Dear Mr. Abbott: This is in reply to your letter of December 11, 1969 regarding brake fluid certification. As noted in your letter, the practice in the United States is that laboratories certify to the manufacturers that their fluids meet either SAE or Federal Motor Vehicle Safety Standards. There is no control over the laboratories by SAE or the Federal Government. The competence of the laboratories is determined by the industry and those who use the laboratories specifically. The policy which has been and will continue to be followed by SAE is to produce the best standards available and not to be involved in the deterimation of compliance to these standards. Since all SAE standards are for voluntary use by both industry and government, it would not be practical for us to do otherwise. We cannot speak for the Department of Transportation which to the best of my knowledge does not at the present time have any plans to determine the adequacy of independent laboratories. I am referring your letter to Dr. Robert Brenner, Deputy Director, National Highway Safety Bureau (DOT) so that he can provide you with an official position regarding the Federal Government in this matter. If I can be of any further assistance, please let me know. Very truly yours, Henry Martin -- Research Manager cc: Robert Brenner DOW CHEMICAL EUROPE S.A. Society of Automotive Engineers Attn. Hank Martin, permanent secretary, Brake Fluid Committ Dear Mr. Martin, As you are probably aware from certain questions raised at recent SAE Brake Fluid Committee meetings by personnel from Dow Chemical Company, Midland, we in Europe are at present experiencing some difficulty in establishing, for a large potential customer with a significant export business to the United States, the exact legal situation and also procedure required for a brake fluid to be considered legal within the United States. At present, as I understand the situation and please correct me if I am wrong, a brake fluid is legal in the United States if it complies with the Federal Motor Vehicles Safety Standard No. 116 which, in turn, states that fluids complying with SAE J 7OR1, R3 (and presumably J 1703 and J 1703a) automatically comply with Regulation 116. The big question now is: who is to determine whether a brake fluid complies with SAE specifications. In the United States, the practice is, I am informed, for the manufacturer to submit the fluid in question to a so-called independent testing institute for examination against SAE specifications. Examples of such institutes would be Foster O. Snell, Electrical Testing, South-Western Research etc. and they would, as a disinterested party between manufacturer and buyer, issue a notarised certificate stating whether the fluid did or did not fulfil SAE specifications. The point recently raised by our customer, however, was that does the Department of Transportation or the SAE, whose specification constitutes Standard 116, have any control or check on these independent laboratories, also does any official D.O.T. or SAE approval exist which would then certify these laboratories as being approved testing institutes capable of testing brake fluids completely against the legal mimimum requirements. Consequently, I am asking you to kindly state for me the official SAE standpoint in this matter. My since thanks in advance for your trouble. Yours faithfully, J. G. Abbott -- Transportation Chemicals Development and Service |
|
ID: 08-003470 Recaro movable seat back heightOpenMs. Amy Sanford Recaro North America, Inc. 4120 Luella Lane Auburn Hills, MI 48326 Dear Ms. Sanford: This responds to your letter requesting an interpretation of S5.2.1.1 of Federal Motor Vehicle Safety Standard (FMVSS) No. 213, Child Restraint Systems, with regard to an infant carrier that you would like to bring to the U.S. market. We regret to inform you that we cannot interpret the standard in the manner you suggest. According to your letter, your infant seat incorporates an adjustable back rest with an integral harness. The child restraint enables the consumer to adjust (raise) the restraints shoulder harness by a lever mechanism to adjust to a growing child without having to remove the harness from the seat back. When the shoulder harness is raised by the lever, the infant seat back is also raised. When the seat back is adjusted to the lowest position, it has a height of 410 millimeters (mm). You state that when it is raised to the full up position, the seat back is at least 500 mm. S5.2.1 of FMVSS No. 213 specifies requirements for the minimum head support surface for child restraints other than car beds. S5.2.1.1 requires each child restraint to provide restraint against rearward movement of the head of the child (rearward in relation to the child) by means of a continuous seat back of a specified height. For child restraints recommended by their manufacturer for use by children of not more than 18 kilograms (40 pounds), S5.2.1.1(a) specifies that the height of the portion of the seat back providing head restraint must not be less than 500 mm. From the information you provided, it appears your restraint does not meet S5.2.1.1(a) of the standard. In the lowest adjustment position, the seat back height is 410 mm, which is less than the minimum height requirement of 500 mm. The requirement does not provide for adjustable seat backs. We note that your restraint requires action on the part of the consumer to raise the seat back height. There is a risk that consumers who neglect to raise the harness straps (and thus raise the seat back) or who attempt to raise the straps but do so incorrectly could use the child restraint with the seat back at the 410 mm height with older infants. In short, we cannot interpret S5.2.1 as permitting a seat back height of less than 500 mm. I hope this information is helpful. If you have any further questions, please contact Deirdre Fujita of my staff at (202) 366-2992. Sincerely yours, Anthony M. Cooke Chief Counsel ref:213 d.11/20/08 |
2008 |
Request an Interpretation
You may email your request to Interpretations.NHTSA@dot.gov or send your request in hard copy to:
The Chief Counsel
National Highway Traffic Safety Administration, W41-326
U.S. Department of Transportation
1200 New Jersey Avenue SE
Washington, DC 20590
If you want to talk to someone at NHTSA about what a request for interpretation should include, call the Office of the Chief Counsel at 202-366-2992.
Please note that NHTSA’s response will be made available in this online database, and that the incoming interpretation request may also be made publicly available.