Make sure that the interlock lever is in the locked position every time after the MOB boat has been used and before releasing the lashings of the boat during drills says Sweden’s Transport Agency. The warning comes after an accident during a drill involving a Schat-Harding MOB boat which fell 14 metres from its davits with three crew onboard.
The incident occurred because the interlock lever on the hydrostatic unit did not work.
Says the Swedish Transport Agency: “During a drill an accident occurred with a MOB boat of Schat-Harding make onboard a tanker when at anchorage outside Rotterdam, the Netherlands. Three crewmembers, Safety officer, 1st Engineer and AB, went into the boat and the AB released the lashings. The safety officer was about to show the 1st engineer the function of the release hook and when pulling the handle (A) the MOB boat was released and fell from its fixed position in the davit into the water about 14 meters down.
Inspection by the maker and the classification company after the accident shows that the interlock lever (D) from the hydrostatic unit was stuck in the unlocked position. This interlock lever should come automatically back to the locked position by a spring but this automatic return did not function and was found stuck. Thus it was possible to release the boat from its position in the davit.
The Swedish Transport Agency recommends that vessels with the same or similar construction of MOB boat release mechanism make sure that the interlock lever is in the locked position after every time the MOB boat has been used and before releasing the lashings of the boat during drills.