Motorcoach

NTSB: Mechanical failure caused fatal Seattle crash

Posted on November 17, 2016

Linked 3D laser scans depicting frontal damage on the accident DUKW vehicle. Courtesy NTSB
Linked 3D laser scans depicting frontal damage on the accident DUKW vehicle. Courtesy NTSB

The National Transportation Safety Board (NTSB) determined that the mechanical failure of the left front axle of an amphibious passenger vehicle is the probable cause of a fatal 2015 collision involving the amphibious passenger vehicle, a motorcoach, and three passenger vehicles on the Aurora Bridge, in Seattle.

Improper manufacturing by Ride the Ducks International, the vehicle manufacturer, and inadequate maintenance by Ride the Ducks of Seattle, the vehicle owner and operator, resulted in the axle failure that subsequently led to the loss of vehicle control, according to the NTSB’s final report.

The lane crossover crash occurred when the driver of the DUCK 6 amphibious passenger vehicle lost control while traveling northbound across the Aurora Bridge and veered into the southbound center lane, where the motorcoach was traveling. The DUCK 6 struck the motorcoach, killing five motorcoach passengers, and injuring 71 others on both vehicles. Three other vehicles were damaged during the crash sequence.

Contributing to the passenger injuries were the lack of occupant crash protections for the amphibious passenger vehicle and the high impact forces of the crash. Occupant protection is an issue area on the NTSB Most Wanted List of safety improvements.

“This was not a case of an impaired, fatigued, or distracted driver or of any inappropriate actions by either driver. Rather, the crash was due to a mechanical failure on the amphibious passenger vehicle that should have been addressed,” said NTSB Chairman Christopher A. Hart. “This crash is a cautionary tale of what can happen when a manufacturer does not follow established rules about fixing safety defects.”

The docket material for the Seattle crash investigation — which contains interview summaries, investigative group factual reports, relevant photos, maintenance records, and a video study from a surveillance camera that captured the final crash sequence — is available here.

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