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Bus Door Failure

Metallurgical failure analysis was requested after a sudden opening bus door failure. The failed bus door opening mechanism is shown in Photograph A.

Bus Door Failure
Photograph A  failed bus door opening mechanism.

Examination and analysis focused on the door opening mechanism and opening mechanism mounting plate.  The mounting plate for the door opening mechanism was observed to be visibly deformed. The design of the plate was also analyzed. The cause of the failure was determined to be deficient design. The door opening mechanism support plate was too thin and had deformed prior to the incident. This design defect resulted in deformation of the bus door opening mechanism and a sudden unexpected opening of the bus door.

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J.E.I. Metallurgical, Inc.

5514 Harbor Town
Dallas, Texas 75287

Phone: (972) 934-0493
Fax: (469) 737-3938
Email: r.c.jerner@metallurgist.com

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