The Marine Accident Investigation Branch (MAIB) has cited failure of fastenings that connected a crane to a workboat as a contributor to a tragic death at the Isle of Mull, Scotland.
In April 2015, the skipper of a vessel named Carol Anne died after being struck by a crane which collapsed. The crane had been installed just over six weeks earlier.
The MAIB found that the crane was installed with smaller and fewer tie bolts than intended by its manufacturer and that the lock nuts used were of a lower grade material strength than indicated by their markings.
The Investigation Branch also said no installation guidance was provided with the crane and that statutory thorough examination and test of the crane, following installation, did not identify the inadequacy of the mounting arrangement.
Recommendations were made prior to the report to West Yorkshire Trading Standards about misleading markings on the lock nuts.
Image courtesy of the Marine Accident Investigation Branch.