Interpretation ID: nht93-3.8

DATE: April 20, 1993

FROM: Dennis Platt -- Sergeant, Program Supervisor, Vehicle Safety & Equipment Section, Department of Public Safety, Utah Highway Patrol

TO: Marvin Shaw -- U.S. Department of Transportation, NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 6-17-93 from John Womack (Signature by Kenneth N. Weinstein) to Dennis Platt (A41; Std. 205)

TEXT: Recent school bus and truck inspections performed by inspectors from our agency have found some safety glass installations that may or may not be legal application.

Windshields (flat glass applications) in some Blue Bird School buses and other heavy trucks have been replaced locally with glass that is marked;

- Buchman AS1 Safety Laminated Float glass DOT #146M-592 16 CFR 1201 CAT II

Other manufacturers are etching similar markings on flat glass for replacement windshields, all of which are marked with the common AS1, 16 CFR 1201 CAT II marking.

In speaking with Mr. Messera of your office, he indicated he was not aware of any automobile AS1 glass that has been dual certified as being 16 CFR 1201 CAT II.

In reading 16 CFR 1201, our staff has been unable to find any provision in the regulation that allows dual certification.

If there is such a provision, and AS1 glass may also be 16 CFR 1201 CAT II, and 16 CFR 1201 CAT II may also be AS1 certified, please advise.

Our intent is to prevent glass which has been designed for shower stall doors and patio doors from being installed in school bus windshields and side windows and similar applications in heavy trucks.

Your attention and response in this matter is appreciated.