Richard Blake, 63, was a welder and fabricator for Point Engineering which designs doors and hatches. In February 2014 Blake was positioning the marine hatch ready for inspection. He used a sling and overhead crane to move it to a vertical position so a surveyor could stamp the hinge with an approval mark.
The door fell on to Blake, trapping his pelvis and legs. His pelvis was shattered and he sustained a broken hip.
The surveyor was standing about 1 m away when the accident happened. He narrowly escaped injury when the hatch and frame grazed the toe of his safety boot.
At Hull Crown Court, Point Engineering pleaded guilty to breaching Regulation 3(1)(a) of the Management of Health and Safety at Work Regulations, which requires employers to make a suitable and sufficient risk assessment. It was fined £30,000 with £24,577 costs.
"If the job had been correctly planned and risk assessed then a safe way of doing the job could have been established," said Health and Safety Executive inspector Sarah Lee after the hearing.