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Mooring at Station Pier

Issue number: MO-2016-001-SI-03
Who it affects: All ship masters and deck officers
Issue owner: TT-Line Company
Operation affected: Marine: Shipboard operations
Background: Investigation Report 324-MO-2016-001
Date: 11 May 2017

Safety issue description

While TT-Line Company’s standard mooring line pattern for ships at Station Pier had been successfully used for many years, the breakaway indicated the risk could have been further reduced to better prepare for such unusual circumstances.

Proactive Action

Action organisation: TT-Line Company
Action number: MO-2016-001-NSA-003
Date: 11 May 2017
Action status: Closed

Mooring arrangements

TT-Line advised the ATSB that it has commenced an in-depth review and analysis of berthing ships at Station Pier. This has included engaging external maritime consultants to conduct assessment, analysis and simulations of the mooring conditions and arrangements. The aim is to achieve recommendations on the optimal operating parameters including changes to berthing arrangements and infrastructure if necessary.

TT-Line also advised that the initial consultant’s mooring analysis report had verified the mathematical model used for computer simulations, which had confirmed the details and sequence of the incident. The ongoing analyses will define operational parameters and propose necessary changes to ship berthing arrangements and/or infrastructure.

In addition to these analyses, all mooring lines have been changed to the same type and specifications, with breaking load of 96 t.


TT-Line has updated and expanded procedures in relation to weather preparations and responses at Station Pier. This includes advising ships’ crews that all mooring lines are to be held on the winch brake, not in self-tension

The procedural review is ongoing and changes are to continue based upon the outcomes of the mooring investigations.

Weather notification

TT-Line advised the ATSB that it has improved the ship and company procedures and reliability of weather and associated warning notification.

ATSB response:

The ATSB acknowledges the proactive safety taken by TT-Line, which has partially addressed the safety issue. The ATSB considers that the company’s mooring analysis, when completed, and safety action as a result of that analysis have the potential to adequately address the issue. Therefore, the ATSB has issued the following recommendation.


Action organisation: TT-Line Company
Action number: MO-2016-001-SR-005
Date: 11 May 2017
Action status: Released

The Australian Transport Safety Bureau recommends that TT-Line Company take necessary action to adequately address the safety issue following the completion of its mooring analysis.

Current issue status: Partially addressed
Status justification:

In addition to the pro-active action taken to date, further action by TT-Line following the completion of its mooring analysis has the potential to adequately address the safety issue.

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Last update 11 May 2017