What Is a Planned Maintenance System?

A Planned Maintenance System (PMS) is a structured framework used aboard ships to schedule, track, and record maintenance activities across all machinery, equipment, and safety systems. Rather than responding reactively to breakdowns, a PMS enables crews to perform maintenance at pre-defined intervals — based on running hours, calendar dates, or manufacturer recommendations — to prevent failures before they occur.

PMS software has become the industry standard, replacing paper-based systems across most professional fleet operations. Common software solutions used at sea include AMOS, SERTICA, ShipManager, and DNV's various management platforms.

Why a PMS Is Essential for Safe Vessel Operations

Class societies, flag states, and port state control authorities all expect vessels to demonstrate that maintenance is being carried out systematically and documented properly. A well-maintained PMS record provides evidence during inspections that a ship is being managed in compliance with the International Safety Management (ISM) Code.

Beyond compliance, a robust PMS helps to:

  • Reduce unplanned breakdowns and costly off-hire periods
  • Extend the operational life of machinery and equipment
  • Improve crew safety by ensuring safety-critical systems are always functional
  • Streamline the handover of responsibilities between crew rotations
  • Support budgeting and spare parts procurement planning

What Does a PMS Typically Cover?

A comprehensive PMS encompasses virtually every system on board, including:

  • Main Engine & Auxiliary Engines: Cylinder overhauls, turbocharger servicing, fuel injection system checks
  • Deck Machinery: Winches, windlasses, mooring equipment
  • Safety Equipment: Lifeboats, fire suppression systems, immersion suits, EPIRBs
  • Navigation Equipment: ECDIS, radar, GPS, AIS — calibration and software updates
  • Hull & Structure: Corrosion monitoring, coating condition, watertight integrity
  • Electrical Systems: Switchboards, generators, emergency lighting
  • HVAC & Refrigeration: Cargo refrigeration systems, accommodation air conditioning

Setting Up and Running a PMS Effectively

1. Populate the System Accurately

The PMS is only as good as the data in it. Ensure all equipment entries reflect the actual machinery on board, with correct manufacturer specifications and maintenance intervals. Inaccurate data leads to missed maintenance and false compliance records.

2. Prioritize Jobs by Criticality

Not all maintenance tasks carry the same risk if deferred. Safety-critical systems — fire detection, lifeboat release mechanisms, steering gear — should be treated as non-negotiable. Build a clear hierarchy so crews know which overdue jobs to escalate immediately.

3. Record Everything

The value of a PMS lies as much in its history as its forward planning. Detailed job records — who did the work, what was found, what parts were used — provide invaluable diagnostic information when troubleshooting recurring issues.

4. Integrate with Spare Parts Management

Link your PMS to inventory management so that upcoming maintenance tasks automatically trigger spare parts checks and procurement requests. Running out of critical spares mid-voyage is avoidable with proper planning.

5. Regular Audits and Reviews

Office-based fleet managers should regularly review PMS completion rates and overdue jobs. A consistent pattern of deferred maintenance on a specific vessel is a red flag that warrants investigation — whether it's a crew resource issue, a training gap, or a systemic equipment problem.

Common PMS Pitfalls to Avoid

  • Closing jobs without actually completing the work ("paper maintenance")
  • Outdated equipment lists that don't reflect modifications made to the vessel
  • Allowing large backlogs of overdue jobs to accumulate before dry dock
  • Failing to update maintenance intervals after manufacturer service bulletins

The Bottom Line

A well-run planned maintenance system is one of the most effective tools a ship manager has for controlling costs, ensuring safety, and maintaining regulatory compliance. Treat it as a living document — not a box-ticking exercise — and it will pay dividends throughout the vessel's operational life.