Interpretation ID: nht71-5.40

DATE: 10/05/71

FROM: AUTHOR UNAVAILABLE; D. Schmeltzer for L. R. Schneider; NHTSA

TO: Aston Martin Lagonda Limited

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of September 8, 1971, in which you request clarification of Motor Vehicle Safety Standard No. 202, "Head Restraints". You state that you are of the opinion that "a head restraint system that can be retracted into the seat and thus made ineffective by virtue of being adjustable is in conflict with the prime object of the standard in reducing the frequency and severity of neck injuries in rear end or other collisons."

Standard No. 202 does not prohibit head restraints from being adjustable in an up-and-down direction, as long as the top of the restraint, at its fully extended design adjustment position, is at least 27.5 inches above the seating reference point (S4(b)(1)). While some of these adjustable head restraints may not be completely effective in cases where they are placed at their lowest adjustment position and used by tall drivers, we have determined that this design, as long as it meets the requirements of the standard, is a minimum performance level that meets the need for motor vehicle safety. Consequently, use of these types of restraints does not conflict with the standard.

The standard establishes only a minimum performance level, however, and the NHTSA endorces efforts by manufacturers to exceed the

2 requirements is establishes. Many manufacturers have installed head restraints in their vehicles that meet the standard's requirements yet do not present the disadvantages you describe.

We are pleased to be of assistance.

ASTON MARTIN LAGONDA LIMITED

September 8 1971

Douglas W. Toms, National Highway Traffic Safety Administrator, National Highway Traffic Administration,

As designers and manufacturers of the Aston Martin DBS V8 car, currently being marketed in U.S.A., we are concerned at what appears to be a very loose interpretation of Motor Vehicle Safety Standard No. 202, Head Restraints - Passenger Cars, Section 5.4(b), adopted by certain American automobile manufacturers.

Aston Martin Lagonda have been concerned for many years with primary and secondary safety aspects of the car, and we hold the view that a head restraint system that can be retracted into the seat and thus made ineffective by virtue of being adjustable, is in conflict with the prime object of the Standard in reducing the frequency and severity of neck injuries in rear end or other collisions.

We would appreciate clarification on this point, for our concern is to maintain the highest standard of interior safety as exemplified by our current production car.

H. Beach Director of Engineering

c.c. Mr. R. Layland, President, A.M.L. Inc. Mr. J. B. Walker, Vehicle Safety Engineer, A.M.L. Limited.