Interpretation ID: nht81-3.6

DATE: 08/07/81

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Volkswagen of America, Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your recent letter asking which of the specific requirements of Safety Standard No. 209, Seat Belt Assemblies, must be met by an automatic seat belt assembly that is installed in a vehicle in accordance with the automatic restraint requirements of Safety Standard No. 208, Occupant Crash Protection.

The agency has stated in the past that automatic seat belt assemblies must meet the adjustment requirements of paragraph S7.1 of Safety Standard No. 208, and those parts of Safety Standard No. 209 that are incorporated by reference in S7.1, whether or not the automatic belts are installed to meet the frontal crash protection requirements of paragraph S5.1 of Safety Standard No. 208. Automatic belts that are installed to comply with the frontal crash protection requirements are excepted from the other requirements of Safety Standard No. 209 by paragraph S4.5.3.4 of Safety Standard No. 208. As noted in your letter, paragraph S7.1 of Safety Standard No. 208 requires the automatic belt assembly to have a retractor that complies with Safety Standard No. 209. However, the requirements for retractor performance in Safety Standard No. 209 are based on other tests in the standard which are used for preconditioning or as prerequisites. Therefore, you state that it is not clear which requirements must be met by a retractor on an automatic belt assembly.

Paragraph S7.1 of Safety Standard No. 208 is only intended to incorporate by reference those provisions in Safety Standard No. 209 that are directly related to retractor performance. Therefore, all automatic belt retractors are required to comply with the following provisions of Safety Standard No. 209: S4.3(j); S4.3(k); and S5.2(a), (b), (j), and (k). Please note, however, that the retractors do not have to comply with paragraph S4.4 which is incorporated by reference in S4.3(k), since S4.4 relates to the performance of entire belt assemblies.

I hope this has been responsive to your inquiry. We apologize for the delay.

Sincerely,

ATTACH.

VOLKSWAGEN OF AMERICA, INC.

APRIL 29, 1981

Frank Berndt -- Chief Counsel, National Highway Traffic Safety Administration SUBJECT: Request for Interpretation - FMVSS 208 and 209 Requirements for Automatic Belts

Dear Mr. Berndt:

Federal Motor Vehicle Safety Standard (FMVSS) 208, which specifies restraint system requirements for passenger cars, includes a paragraph (S 4.5.3.4) which modifies the applicability of FMVSS 209 to automatic belts. The paragraph actually states that an automatic belt which is not subject to perpendicular frontal crash protection requirements of FMVSS 208 shall meet the webbing, attachment hardware, and assembly performance requirements of FMVSS 209. We believe that the converse is then also true, i.e., that automatic belts which are subject to the perpendicular frontal crash protection requirements do not have to meet the webbing, attachment hardware, and assembly performance requirements of FMVSS 209. On the face of it, and after examination of FMVSS 209, it would seem that these crash-tested automatic belts are then exempt from the entire FMVSS 209. The agency reinforced this belief in a letter of interpretation to Mr. Nield (Attachments 1 & 2).

However, this situation is confounded by a requirement, also in FMVSS 208 (ref. S 4.5.3.3(a)), that automatic belts comply with S 7.1 of the standard. This section, in addition to specifying belt fit requirements, requires a retractor which conforms to FMVSS 209. This conflict with the agency's letter of interpretation to Mr. Nield was brought up by Mr. Pepe (Attachment 3), and the agency responded with a further letter of interpretation to Mr. Pepe (Attachment 4). This letter stated that the automatic belts must meet the fit requirements of S 7.1, "and those parts of Safety Standard No. 209 incorporated by reference". To the best of our knowledge, this response to Mr. Pepe represents the agency's latest pronouncement on the topic.

This now brings us to our question: Exactly what specific parts of FMVSS 209 are applicable to automatic belts? The language of S 7.1 of FMVSS 208, and the letter of interpretation to Mr. Pepe would imply that the paragraphs which apply would be those relating to retractor performance. Mr. John Smreker of my staff suggested this to Mr. Hugh Oates, and he tentatively concurred. However, the interrelationship of the test sequences in FMVSS 209 and the requirements that one test serve as a prerequisite or precondition for another, would seem to bring in sections of FMVSS 209 which are specifically enumerated as excluded in S 4.5.3.4 of FMVSS 208. n1 We therefore need the agency to clarify exactly which paragraphs and which sections of FMVSS 209 do and do not apply to automatic belts.

n1 FMVSS 209 S 4.3(k) Performance of Retractor specifies that the retractor must meet the requirements of S 4.4 (after the tests in S 5.2(k)). However, S 4.4 is entitled "Requirements for Assembly Performance", a topic which is specifically excluded in FMVSS 208 S 4.5.3.4.

We will appreciate your prompt consideration of this matter.

Very truly yours,

Dietmar K. Haenchen -- Vehicle Regulations

Encl.

ATTACHMENT 1

Joseph Levin -- Chief Counsel, National Highway Traffic Safety Administration

Subject: Request for an Interpretation FMVSS 208/209

Dear Mr. Levin:

In reviewing the requirements presented in FMVSS 209, Seat Belt Assemblies in connection with the design of passive belt systems, there appears to be no distinction between the applicability of the standard as to active and passive belt systems. In reviewing FMVSS 208, Occupant Crash Protection However, paragraph 4.5.3.4 appears to exempt passive belt systems from compliance in any manner with the requirements of FMVSS 209. Since such an exemption would provide the design latitude necessary in the development of an optimum passive belt system, I would appreciate your confirmation that this exemption is intended.

In view of the extensive development efforts now underway in the engineering departments of many manufacturers, an expeditious response to this request would be appreciated.

Sincerely,

ATTACHMENT 2

George C. Nield

George C. Nield -- President, Automobile Importers of America

July 17, 1978

Dear Mr. Nield:

This responds to your recent letter asking whether passive safety belts are exempt from the requirements of Safety Standard No. 209, Seat Belt Assemblies.

The answer to your question is yes, with one exception, (Illegible Words) of Safety Standard No. 208, Occupant Crash Protection, specifies that passive safety belts that are not required for the vehicle to meet the perpendicular frontal crash protection requirements of the standard must meet the requirements of Standard No. 209. Therefore, only passive belts that are installed to meet the frontal crash protection requirements of Standard No. 208 are exempted from the requirements of Standard No. 209.

Sincerely,

Joseph J. Levin -- Chief Counsel, NHTSA

ATTACHMENT 3 Joseph J. Levin, -- Chief Counsel, National Highway Traffic Safety Administration

July 23, 1979

Reference: Your letter dated July 17, 1978 to Mr. George C. Nield, President, Automobile Importers of America - NOA-30.

Dear Mr. Levin:

I have this date, received a copy of your letter, referenced above, concerning the testing of passive seat belt assemblies to FMVSS No. 208 or 209 requirements. I feel that your letter may need some clarification or I need some further interpretation.

The question posed was pertaining to para. S4.5.3.4 of FMVSS No. 208. Your answer to that question was yes, that seat belt passive systems are exempt from FMVSS No. 209 testing with the exception of those that are not required to meet the perpendicular frontal crash protection requirements.

My interpretation of the Standard is that the aforementioned paragraph replaces only the assembly performance requirements of FMVSS No. 209, which is a Static Test, with the Dynamic test requirements of FMVSS No. 208.

Paragraph S4.5.3.3 of FMVSS No. 208 states that the passive belt assembly must meet the requirements of FMVSS No. 209 for retractor performance (para. S7.1 Adjustment). Therefore, all passive belt systems whether or not they are installed to meet the frontal crash protection requirements must conform to paragraph S7.1 (S4.5.3.3) of FMVSS No. 208. If my interpretation is not correct, then a retractor which will encounter more usage in a passive belt system, does not have to be tested for endurance per FMVSS No. 209 (i.e. resistence to environments, cycling and retraction force); but an active belt system which sees far less use, must meet those same 209 tests.

In view of testing programs presently in progress for several manufacturers an early reply would be greatly appreciated.

Very truly yours,

Frank Pepe -- Assistant Vice President, Engineering Division

Frank Pepe -- Assistant Vice President, United States Testing Co., Inc.

ATTACHMENT 4

SEPTEMBER 12, 1979

Dear Mr. Pepe:

This responds to your recent letter concerning the requirements applicable to automatic seat belts under Safety Standard No. 208, Occupant Crash Protection. Specifically, you ask for confirmation that all automatic belts must comply with the adjustment specifications of paragraph S7.1 of the standard.

Your understanding is correct. Automatic seat belts must meet the adjustment requirements of paragraph S7.1, and those parts of Safety Standard No. 209 incorporated by reference, whether or not they are required to meet the frontal crash protection requirements of paragraph S5.1 of the standard. Automatic belts that are installed to meet the frontal crash protection requirements are excepted from the other parts of Safety Standard No. 209 by paragraph S4.5.3.4 of Safety Standard No. 208. Please contact Hugh Oates of my office if you have any further questions (202-426-2992).

Sincerely, STEPHEN P WOOD -- NHTSA