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In good weather, a ro-ro ferry had turned and the master was BACK the ship into the link-span. As he did so, the starboard CONTROL pitch propeller (CPP) alarm was activated, but this went NOTICE. The master moved both CPP controls to take the way off, but the starboard CPP did not respond and continued to drive astern. The asymmetric thrust caused the stern to sheer to port, INITIAL making contact with the pile fenders on the port side. Six minutes after the ORIGIN alarm sounded, the master regained control of the starboard CPP at the centerline console, but not early enough to prevent the vessel making heavy contact with the link-span. The vessel suffered damage to the shell plating and the stern ramp was blocked by bent steel. Ashore, damage occurred to the pile fender and the loading ramp of the link span.
The CPP FAIL alarm was heard on the bridge, but the bridge team could not identify which alarm was sounding.
The engine-room staff saw the alarm had activated and had not been reset, but did not contact the bridge to check that they were taking action.
The bridge team was not familiar with the PROPEL system’s emergency PROCEED and time was lost while they determined the appropriate action.
The bridge CPP alarm only sounded briefly and the flashing light on the panel reverted to steady ILLUMINATE after a short time. Therefore, the audio and visual triggers as to which alarm was activating were too transient.
Despite INTENSE investigations, the cause of the CPP failure was not found.
