In the latest edition of its Safety Digest, the UK MAIB presents the injury of three crew members on board a bulk carrier, during berthing operations, in a UK port, when the accommodation ladder they were rigging collapsed. UK MAIB provides a description of the case and important lessons learnt, to prevent similar accidents from occurring again.
The incident
Once the 190m-long bulk carrier was moored alongside, the three crewmen were sent to rig its starboard accommodation ladder. The accommodation ladder was in its stowed position and needed to be un-stowed, lowered to the quayside and rigged ready for use.
The top of the accommodation ladder was hinged onto a turntable, which in turn was mounted on a platform attached to the ship’s deck. The access platform at the bottom of the ladder was fitted with a set of collapsible handrails on either side.
The crew initially released the ladder’s stowage securing arrangements and lowered it from its vertical stowage position to a horizontal position outboard and parallel to the hull of the ship, over the quayside. The bottom platform of the ladder was then lowered to position just above the quayside. With the free end of the ladder still suspended from its winch wires, the three crew members started to descend the ladder in order to rig the handrails. As they did so, the turntable at the top of the ladder fell away from the ship and onto the quayside below. All three crew members fell off the ladder and were injured when they landed on the quayside. They were all taken to hospital for treatment and made full recoveries from their injuries.
The turntable at the top of the accommodation ladder was secured to the platform with a bolted central pivot pin, and was supported by two sets of roller bearings.
Upon investigation, it was found that the failure of the accommodation ladder was due to the corrosion of the central pivot pin, which had caused the turntable to detach from its support platform. In addition, the turntable’s roller bearings were completely rusted and had seized solid. The surrounding metal structure of the platform was also wasted due to corrosion.
According to the ship’s maintenance management system, the ladder, turntable and support platform should have been inspected and greased on a monthly basis. It was evident from the post-accident inspection, that the greasing point in the centre of the turntable had not been used for some time. It was also evident that the roller bearings could not be inspected or greased without unbolting the turntable from the platform, and dismantling it. There was no record of this task ever having been done.
Lessons learnt
