Interpretation ID: nht92-4.40

DATE: 08/12/92

FROM: DENNIS T. JOHNSTON -- ENGINEERING PLANNING AND LIAISON MANAGER, ROVER GROUP NORTH AMERICAN ENGINEERING OFFICE

TO: ADMINISTRATOR -- NHTSA

COPYEE: GREG DANA -- AIAM

TITLE: SUBJECT: PETITION FOR RECONSIDERATION - FMVSS 214 - SIDE IMPACT PROTECTION; LIGHT TRUCKS, BUSES AND MULTIPURPOSE PASSENGER VEHICLES; FINAL RULE

REFERENCE: DOCKET NO. 88-06, NOTICE 19, FMVSS 214 - FINAL RULE: RESPONSE TO PETITIONS FOR RECONSIDERATION DATED JULY 13, 1992 FR VOL. 57, NO. 134 PP 30917-23

ATTACHMT: ATTACHED TO LETTER DATED 11-10-92 FROM BARRY FELRICE TO DENNIS T. JOHNSTON (A40; STD. 214)

TEXT: Rover Group Ltd., the British manufacturer of the Range Rover Multipurpose Passenger Vehicle (MPV), submits the following in response to the referenced Final Rule amending FMVSS No. 214, 'Side Impact Protection; Light Trucks, Buses and Multipurpose Passenger Vehicles'.

The July 13, 1992 Final Rule introduces a concept that had not been previously addressed in the June 14, 1991 Final Rule or the NPRM dated January 15, 1992. That is the classification of contoured doors by the ratio of the width of the lowest portion of the door to the width of the door at its widest point ("ratio"). This classification is not specifically mentioned in the preamble (except obliquely as ". . . certain contoured doors . . ."), but rather, appears directly in the rule in Section 3(e)(7).

Specifically, the July 13, 1992 Final Rule treats contoured doors with a ratio of greater than 0.5 differently than those whose ratio is 0.5 or less. It is Rover Group's understanding following the final rule that a contoured door on a multipurpose passenger vehicle whose width of the lowest portion of the door, for example, measured 41 centimeters and whose widest portion measured 80 centimeters would be required to meet the current quasi-static door strength procedures contained in FMVSS 214 for passenger cars beginning with vehicles produced after September 1, 1993. Multipurpose passenger vehicles (trucks and buses, as well) with contoured doors whose ratio was 0.5 or less (whose lower most width was 40 centimeters or less in the above example) would not be required to have these contoured doors meet quasi-static requirements until September 1, 1994, with the inference that a newly proscribed test procedure would be promulgated for these doors far enough in advance to allow manufacturers to meet this requirement.

However, in conversation with NHTSA staff since the release of the July 13, 1992 Final Rule it appears that NHTSA is considering another discriminator other than the 0.5 ratio to determine which contoured doors for multipurpose vehicles will need to conform to the current quasi-static test or to the not as yet promulgated test.

The current Range Rover has contoured read doors. These doors have a ratio greater than 0.5 (though not significantly greater), and under our interpretation of the July 13, 1992 Final Rule would be required to meet current FMVSS 214 quasi static door strength requirements beginning September 1, 1993. We have developed a design that will meet the current requirements, and have begun to purchase tooling to ensure that production after September 1, 1993 will comply. Any significant change in the test procedure for these doors (along the lines of that proposed in the January 15, 1992 NPRM, for example) would render this tooling obsolete. Thus Rover Group would be required to scrap this tooling at significant cost, and embark on an additional development program. (For details on the design changes necessitated by the test procedure quoted in the January 15, 1992 NPRM please see Rover Group's response dated March 16, 1992.)

Futhermore, based on our side impact test data, we believe that the positioning of door strengtheners that result using the currently specified test procedure in FMVSS 214 is more appropriate than the test procedure in the January 15, 1992 NPRM to offer the passengers of Range Rover vehicles with enhanced side impact protection.

If the Final Rule is to be interpreted as Rover Group has related above (in the third paragraph), please consider this document as a request for interpretation. If, however, NHTSA believes another interpretation is appropriate, please consider this as a petition for reconsideration to align the rule with that contained in this document.

If you have any questions regarding this matter please feel free to contact me on (301) 731-8709 at your earliest convenience.