PSC deficiency code 18416: Mooring Ropes/Lines and Wires

Area 18 Maritime Labour Convention, 2006

Code 18416 is in the MLC health and safety group, so the angle is the people on the mooring deck. A line that parts under load can kill or maim anyone it whips across, and worn ropes and wires are what the inspector looks for here. The SOLAS side of mooring equipment has its own code (02140), as do winches and the lighting of mooring areas.

What the inspector looks at

This is usually checked on the deck round, often with the ship alongside and lines under load.

  • Ropes in use and spares: chafe, cuts, glazed or fused fibres, flattening and internal wear
  • Wires: broken wires, kinks, birdcaging, corrosion, and condition near the eyes
  • Splices, tails, and the shackles or links joining a wire to its tail
  • Line records: certificate, date into service, inspections, end-for-ending and retirement
  • Spare lines stowed off the deck and protected from sunlight and chemicals
  • Snap-back risk at mooring stations covered in the risk assessment and known to the crew

Common findings

  • Mooring ropes in use badly chafed with broken strands
  • Mooring wire with broken wires and kinks
  • Eye splice of forward spring line damaged
  • Mooring tail worn, no certificate on board
  • No records of inspection of mooring lines

The rule behind it

MLC 2006 Regulation 4.3 and Standard A4.3 require the flag's rules to cover reasonable precautions against occupational accidents, including injury from equipment on board. Guideline B4.3.1 lists anchors, chains and lines among the subjects national guidance should deal with. SOLAS chapter II-1, regulation 3-8 (towing and mooring equipment), as amended from 1 January 2024, adds design requirements for mooring arrangements and a maintenance and inspection regime with documentation, backed by IMO guidelines on inspecting and maintaining mooring equipment including lines.

Action codes you are likely to see

A worn line swapped for a good spare during the visit is often marked 10. Lines that have to be bought and delivered are usually 17, or 16 if enough sound lines remain to moor safely. Missing records alone tend to get 16 or 17. Under MLC Standard A5.2.1 a ship can be held when conditions are clearly hazardous to seafarers' safety, so lines likely to part in normal use could lead to 30. See action taken codes.

How to close it

Replace damaged lines and tails with certified ones and keep the delivery note and certificates. Splices should be made by someone competent, following the rope maker's instructions. Update the line register for every line: certificate, date in service, inspections, end-for-ending and retirement criteria. Put photos, certificates and the updated register with the Form B. If records were missing across the board, the office should look at the ISM procedure behind them. Related: access and structural features.

Questions

How often should mooring lines be inspected?

No single interval covers every ship. SOLAS now requires mooring equipment, including lines, to be inspected and maintained, and the IMO guidelines and rope maker's instructions describe how. The company's line management plan should set intervals and retirement criteria, and PSC checks the records against it.

What is a snap-back zone?

The area a parted line can whip through when it breaks under tension; synthetic lines store a lot of energy before they part. Many ships paint these zones on deck, but some guidance warns that a line can recoil outside them, so crew should stay clear of any line under load.

Is a damaged mooring line a detainable deficiency?

It can be, when the lines are clearly hazardous to the crew, which is the MLC test for holding a ship. Usually the inspector asks for replacement before departure.

Sources

Written by the SuperRonin team from the sources above. Last updated 6 Nov 2026. This page explains the rules; the regulation, the PSC officer and your flag and class have the final word. If something here doesn't match what you see on board, write to [email protected] and we'll correct it.

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Other codes in Maritime Labour Convention, 2006

All deficiency codes · Action taken codes