Interpretation ID: nht73-3.5

DATE: 11/22/73

FROM: AUTHOR UNAVAILABLE; Claude S. Brinegar; NHTSA

TO: Honorable John E. Moss; House of Representatives

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of October 26, 1973, concerning our estimate of the time required by vehicle manufacturers to meet the adopted and proposed(Illegible Word) to Motor Vehicle Safety Standard No. 301, Fuel System Integrity.

Our basic approach to leadtime analysis in the automotive industry has been along the lines set forth in(Illegible Word) automotive engineering studies prepared in the early days of the highway safety program by Arthur Young and Company, and by Booz, Allen, and Hamilton. Over the years, we have found these studies to be accurate predictors of the time required to make substantial structural modifications to production vehicles.

On the basis of our preliminary crash tests, we concluded that to meet the 30 mile-per-hour, rear moving barrier crash test, the rear-end structure of a typical vehicle would have to be strengthened considerably. To accomplish such strengthening, the manufacturers may have to change the gauge of metal used, the configuration of the underbody and interior panels, and the location and design of interior braces and(Illegible Word). Any changes of this nature will require major tooling modifications, and tool modification has historically occupied a major portion of the leadtime needed to effect a change.

Our leadtime evaluation, based on our usual techniques, indicated that the tooling time and other production planning time required for the structural changes we expect to be necessary to meet the standard

be at least two years. To this time must be added the time required for us to complete the rulemaking process and present the manufacturers with a final standard to which they can design their vehicles. We were, therefore, obliged to conclude that there was not enough time remaining before September 1975 to allow manufacturers to meet the standard with their 1976 models.

In this as in most rulemaking actions, we are working without benefit of information from the manufacturers on their projected expenditures of funds and man-hours. I would like to be able to tell you, to the minute, what those projections are, but the best I can say is that we have no indications that the manufacturers' plans could place conforming cars in production in less than the time specified in our proposal.

I remain committed to the pursuit of this rulemaking action and assure you that it will be completed expeditiously.