Skip Ribbon Commands
Skip to main content
Bookmark and Share this page

Accident Report Detail

Hoppy's Oil Service, Inc., Truck Overturn and Fire, State Route 128

Executive Summary

‚ÄčThis reports describes and analyzes the left side tractor-tandem equalizer beam failure and the subsequent overturn of the tractor-semitrailer (tank) carrying gasoline on Massachusetts State Route 128 in Braintree, Massachusetts, on October 18, 1973. After failure of the equalizer beam, the vehicle veered to the right and struck a gardrail which redirected the truck back into the roadway. However, the semitrailer overturned onto the guardrail, which puncured the tank shell and permitted gasoline to escape. The overturned vehicle slid on its side back into the roadway, abrading holes in the tank shell permitting further escape of gasoline. The gasoline ignited, killing the truckdriver.

Probable Cause

‚ÄčThe National Transportation Safety Board determines that the cause of loss of control and subsequent overturn of the truck was the failure of the left rear equalizer beam of the tractor tandem suspension. The failure was precipitated by the increased dynamic loading imposed on the equalizer beam as the truck traversed a depression in the roadway. Contributing to the failure of the equalizer beam were: (1) inappropriate maintenance and repair procedures used in the removal of worn bushings and sleeves from the beam, (2) the overweight cargo, and (3) the presence of the minor depression in the road surface.

Accident Location: Braintree , MA    
Accident Date: 10/18/1973
Accident ID: 80343

Date Adopted: 10/2/1974
NTSB Number: HAR-74-04
NTIS Number: PB-237259/AS

Related Report

Related Recommendations

Related Press Releases

Related Events

Related Investigations