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Accident Report Detail

Truck Loss of Braking Contol on Steep Downgrade and Collision with a Vehicle

Executive Summary

On April 25, 1996, a truck with a concrete mixer body, unable to stop, proceeded through an intersection and collided with and overrode a passenger car near Plymouth Meeting, Pennsylvania. The driver of the car was fatally injured, and the truck driver sustained minor injuries.

Probable Cause

​The National Transportation Safety Board determines that the probable cause of this accident was the improper maintenance of the accident truck by the JDM Materials Company, Inc., the fracture of the drain valve, and the inoperative low-air-pressure warning switch, which resulted in the driver’s loss of braking control. Contributing to the accident was the lack of Federal and State inspection procedures for commercial vehicles with dual air brake systems that can detect either reversed air brake lines or inoperative low-air-pressure warning switches.

Accident Location: Plymouth Meeting , PA    
Accident Date: 4/25/1996
Accident ID: NRH96FH009

Date Adopted: 10/17/1997
NTSB Number: HAR-97-02-SUM
NTIS Number: PB97-916202