Bus Door
Failure
Metallurgical failure analysis
was requested after a bus door failure. The failed
bus door opening mechanism is shown in Photograph A.
Photograph A: Overall view of failed bus door opening mechanism
prior to removal from the subject bus.
Examination and analysis focused on the door opening
mechanism and the mounting plate for the door
opening mechanism. 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. This design defect resulted in
deformation of the bus door opening mechanism and
unexpected opening of the bus door.
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