Pup trailer detached while leaving loading area

Safety Alert Type: 
Loading and Shipping
Grand Forks Sawmill
Date of Incident / Close Call: 
Company Name: 
Details of Incident / Close Call: 

A driver entered the yard with his rear trailer on top of the front trailer and had attached the two trailers before he was loaded.

The fifth wheel had some accumulation of grit and ice which the driver tried to remove before attaching the trailer. After being loaded and driving forward 60 metres, the fifth wheel detached between the two trailers of the Super B and the rear trailer brakes locked up (photos in attached pdf).

The rear trailer slid 4 metres and stopped, resting on the landing gear. A post incident inspection determined that grit and ice in the locking mechanism prevented the “dogs” from fully locking into place and securing the connection.

Learnings and Suggestions: 
  • A Supervisor must complete a Hazard Assessment on trailers that are stacked and have to be attached before loading to ensure fifth wheel connections are free of debris
  • Trailers that are stacked must have their fifth wheel covered to prevent dirt and debris from building up on the locking mechanism.


For more information on this submitted alert: 

Darrell Whelan, Safety Coordinator: Darrell.Whelen@Interfor.com

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