What is a Planned Maintenance System (PMS)?

A Planned Maintenance System (PMS) is the digital backbone of ship technical management. It is a software platform used on board vessels — and accessed remotely from shore — to schedule, assign, track, record, and report on all maintenance activities across a fleet's machinery, equipment, and safety systems. Without a PMS, maintenance depends on crew memory, paper logs, and manual follow-up: an approach that fails at scale and under regulatory scrutiny.

A PMS structures maintenance around running hours, calendar intervals, manufacturer recommendations, and class society requirements. Every piece of equipment on board is registered in a technical database with its maintenance history, component records, and upcoming job schedule. When a job falls due, the system generates a work order, assigns responsibility, and tracks completion. When the job is done, it creates a timestamped maintenance record — the audit-ready documentation that class surveyors and PSC inspectors expect to see.

Modern PMS solutions are cloud-based, enabling real-time synchronisation between the vessel and the shore office. Technical superintendents can monitor maintenance compliance across the entire fleet from a single dashboard — tracking overdue jobs, certificate expiry dates, spare parts consumption, and open defects without waiting for port-call reports or emailed spreadsheets.

A PMS is not optional in modern shipping — it is a regulatory and commercial necessity. ISM Code requires documented evidence that planned maintenance is being carried out systematically, and class societies expect comprehensive maintenance records at each survey. A PMS is how both requirements are met in practice.

Beyond compliance, a PMS directly impacts vessel availability and commercial performance. Unplanned machinery failures cause off-hire events that can cost tens of thousands of dollars per day. A well-implemented PMS reduces the frequency and severity of breakdowns by ensuring that critical maintenance is never skipped — and by creating a maintenance history that helps engineers spot patterns before failures occur.

During Port State Control inspections, officers routinely check that planned maintenance records are current and that no jobs are significantly overdue. A ship with poor PMS discipline is a high-risk target for deficiencies and potential detention. By contrast, a well-maintained PMS record sends a clear signal to inspectors that the company takes technical management seriously.

A comprehensive PMS typically includes an equipment register — a complete inventory of all on-board machinery and systems, structured hierarchically by location and function. Each item has an associated maintenance schedule specifying what work needs to be done, at what interval, and to what standard. This database is the single source of truth for everything related to the vessel's technical condition.

The job management function creates work orders when tasks fall due, assigns them to crew members by trade and rank, tracks completion, and records the outcome — including parts used, time spent, and any observations noted. This connects directly to the spare parts and inventory module, where consumables and critical spares are tracked against reorder thresholds. When inventory falls below a minimum level, a purchase requisition can be raised automatically, feeding into the marine procurement workflow.

Advanced PMS systems also support Condition-Based Maintenance (CBM) — allowing jobs to be triggered not just by time or running hours, but by actual equipment condition data such as oil analysis results, vibration readings, or performance deviations from baseline. This moves maintenance from a fixed schedule to a data-driven approach, reducing unnecessary work and improving reliability.

Every Class Survey requires documented evidence that maintenance has been carried out in accordance with the vessel's class-approved maintenance programme. A PMS that is well-maintained and regularly updated gives surveyors exactly this — a comprehensive, timestamped record of all jobs completed, parts used, and observations logged. The alternative — reconstructing maintenance history from paper logs and crew handover notes — raises immediate red flags and can result in conditions of class being imposed.

The ISM Code connection is equally important. The ISM Code requires shipping companies to establish and maintain a planned maintenance system as part of their Safety Management System (SMS). A PMS is the operational tool through which this ISM requirement is fulfilled: it provides the procedural documentation, execution records, and corrective action trails that flag state auditors and class society surveyors expect to find during QHSE management audits.

Integration between the PMS and certificate tracking is also critical. Class surveys, flag state inspections, and statutory certificate renewals all have fixed due dates. A PMS that tracks these alongside maintenance jobs — with automated alerts as deadlines approach — ensures that nothing slips through the gaps before a port call or scheduled survey.

Infoship's PMS module provides a complete technical database for each vessel — equipment register, maintenance schedules, job management, defect tracking, and spare parts consumption — all accessible in real time from ship and shore. Technical superintendents get a fleet-wide dashboard showing maintenance compliance, overdue jobs, and upcoming critical tasks across every vessel under management, without relying on crew to proactively report status.

The system integrates directly with Infoship's procurement module, so parts requirements generated by maintenance jobs can trigger purchase requisitions automatically. This eliminates the communication delays that result in parts arriving too late. The connection to Infoship's Enterprise Asset Management (EAM) framework means that maintenance data contributes directly to fleet-wide KPIs reporting, giving management the information they need to make data-driven decisions about vessel investment and overhaul planning.