Planned Maintenance System (PMS)
A Planned Maintenance System (PMS) is a structured schedule of all recurring maintenance tasks on a vessel, with records of completion, parts used, and defects. Required by ISM for larger commercial yachts, it is best practice for all vessels. A complete PMS log is essential for class surveys and resale.
Definition
Planned Maintenance System (PMS) is a structured schedule that organizes recurring maintenance tasks and records for yachts, supporting ISM compliance and survey readiness.
What is a Planned Maintenance System?
A Planned Maintenance System (PMS) is a structured, documented schedule of every recurring maintenance task on a vessel. It covers all major equipment — engines, generators, steering systems, fire suppression, life-saving appliances, navigation instruments — with fixed intervals, part requirements, and completion records. The PMS is not a to-do list; it is a compliance document and a living maintenance history that travels with the vessel for its entire operational life. For yachts within ISM scope, such as commercial yachts of 500 GT and over, the ISM Code makes a functional PMS mandatory. For private yachts, it is best practice and essential for class surveys and resale.
How a PMS Works on a Yacht
A PMS defines maintenance intervals (hours, days, or calendar triggers), the crew member responsible, parts and consumables needed, and a sign-off field for completion records. When a task is due, it surfaces in the crew's work queue. When complete, the record is logged with date, who performed the work, parts used, and any defects found. Over time, this creates a full service history for each piece of equipment. Digital PMS platforms surface defect patterns, generate refit and dry-dock planning data, and produce the documentation surveyors require.
Task intervals
Tasks can be triggered by engine hours (e.g., oil change every 250 hours), calendar date (e.g., fire extinguisher inspection annually), or event (e.g., post-grounding hull inspection). A complete PMS uses all three trigger types and never lets a task slip because no one calculated the due date manually.
Defect management
When maintenance reveals a defect, the PMS logs it against the equipment item and creates a corrective action record. Unresolved defects are visible on the defect list until closed. Surveyors and Port State Control officers inspect the defect list and its closure rate as an indicator of how well the SMS is functioning.
ISM Code Requirements for PMS
The ISM Code (section 10) requires that the Safety Management System ensure that ships are maintained in conformity with the provisions of relevant rules and regulations and with any additional requirements established by the company. In practice, class societies and flag states translate this into a requirement for a documented maintenance program with verifiable records. For commercially operated yachts, flag surveyors and ISM auditors inspect maintenance records during code surveys and ISM audits. Any gap between required intervals and completed records is a nonconformity.
What to Include in a Yacht PMS
A comprehensive yacht PMS covers every major and safety-critical system. Minimum required categories are:
Main propulsion and engineering
Main engines, gearboxes, shafts, propellers, fuel system (filters, injectors, separators), cooling systems, exhaust, and bilge pumps. Engine-hour-based intervals are mandatory for manufacturer warranty compliance.
Electrical and electronics
Generators, switchboard, battery banks, navigation instruments (GPS, radar, chart plotter, AIS), autopilot, communication (VHF, SSB, satellite), and shore power systems.
Safety and firefighting equipment
Life rafts (annual service), EPIRBs (battery and hydrostatic release dates), fire extinguishers (annual), CO detectors, fixed fire suppression system (engine room), flares (expiry dates), immersion suits, and MOB equipment.
Deck and hull
Anchor windlass, winches, cleats, hatches and seacocks (full open/close test), standing rigging (sailing vessels), running rigging, antifouling record, and hull inspection schedule.
Accommodation and hotel systems
Air conditioning, watermaker, sewage system (blackwater tank and maceration), galley equipment, refrigeration, and crew accommodation systems.
PMS for Private vs Charter Yachts
A private yacht is not subject to commercial coding requirements, but insurance underwriters increasingly require evidence of a maintained PMS for policy continuity and claims. Commercial yacht codes expect documented maintenance, and for charter yachts the records are reviewed at the flag's periodic surveys. Gaps or missing records can put commercial certification at risk, denying the vessel the ability to generate charter income.
PMS Software vs Paper Systems
Paper-based PMS binders remain in use on smaller yachts, but they carry operational and compliance risks. Records are lost in transit, not accessible remotely by the shore team or DPA, and difficult to audit at survey time. Digital PMS platforms centralise all records, automate task scheduling, provide instant access to the full maintenance history for surveyors, and enable the shore team and captain to collaborate in real time. For any yacht above 24m or on commercial operation, a digital PMS is the only practical solution at scale.
Class Survey Readiness and PMS Records
Classification society surveyors (Lloyd's Register, Bureau Veritas, DNV, ABS) base their survey scope on the vessel's PMS records. A well-maintained PMS with no gaps signals low risk; surveyors may scope down certain inspections. A vessel with missing records or unresolved defects receives a full scope survey, extended out-of-water time, and potential conditions of class. The PMS is the single most important document you present at dry-dock.
How HelmOps Supports PMS Workflows
HelmOps includes a maintenance log that follows the PMS workflow: each job records its date, component, service provider, labour hours, warranty, and attached documents, with the next service due by calendar date or by engine hours from a linked hour meter. Maintenance that is due stays readable at sea without connectivity, and changes made offline are queued and sent when the connection returns. The shore team sees the same records, and the maintenance history exports to CSV for surveyors.
PMS for Charter Yachts: REG Yacht Code and Commercial Code Requirements
Charter yachts operating under commercial codes face a fundamentally different PMS requirement than private vessels. The Red Ensign Group Yacht Code, which replaced MCA LY3 for commercial yachts of 24m and over, and other flags' commercial yacht codes expect a formally documented maintenance system that surveyors can check before commercial certification is maintained. The annual survey cycle for a commercially coded charter yacht begins months before the survey date. The operator must demonstrate that every PMS task due in the preceding twelve months was completed on time, that no overdue tasks are outstanding, and that the defect list has been actively managed with all safety-critical defects closed. A surveyor from the flag state or a recognised organisation reviews these records during the yacht's periodic surveys. Nonconformities arising from PMS failures are not minor findings. A vessel with documented overdue maintenance on safety-critical equipment — life raft service, EPIRB battery, fire suppression test — faces conditional clearance at best and suspension of the commercial permit at worst. A suspended commercial permit means the vessel cannot legally carry charter guests and generates zero revenue during the suspension period. The cost of proper PMS compliance is categorically lower than the cost of a single permit suspension. The relationship between PMS and SMS is critical for commercial yacht code compliance. The Safety Management System (SMS), required by the ISM Code for commercial yachts of 500GT and over, uses the PMS as its maintenance delivery mechanism. An SMS without a functioning PMS is incomplete and will fail ISM Code audit. For commercial yachts under 500GT, the REG Yacht Code requires a simplified safety management system, which must still reference the maintenance program — the PMS is the operational record that proves the safety framework is working, not just documented. Requirements for commercial yachts under 500GT differ from those for yachts of 500GT and over in scope and depth, but not in the fundamental obligation for documented maintenance. Class-maintained yachts add the class society's own survey requirements, including continuous survey arrangements, on top. Crew training on PMS procedures is a separate requirement that intersects with both ISM Code compliance and MLC (Maritime Labour Convention) obligations. Engineers and deck officers must be briefed on the vessel's PMS at the start of their contract. The training record must be held in the crew file. ISM Code section 6 requires that personnel assigned to safety-critical maintenance tasks are trained and competent for those tasks — a signed familiarisation record for the PMS is the minimum acceptable evidence.
PMS for Yachts Under 24m and Under 500GT
Private yachts under 24m have no mandatory PMS requirement under international convention, but the operational and financial risks of operating without one are significant and growing. Insurance underwriters are increasingly requesting PMS records at policy renewal — particularly following any claim — and the absence of documented maintenance history is treated as an aggravating factor in loss adjustment. Pre-purchase survey expectations have shifted. A marine surveyor conducting a survey for a prospective buyer now routinely requests the full maintenance record. A vessel with no PMS history cannot demonstrate that its condition corresponds to its age and usage hours. Surveyors apply a higher uncertainty factor, recommend a longer punch list, and buyers use the absence of records to negotiate price reductions. A thorough PMS history is a verifiable asset with direct monetary value at time of sale. Flag state requirements for smaller vessels vary by registry. Gibraltar, the UK (under the MCA Small Commercial Vessel Code), France, Italy, and Spain all impose maintenance-adjacent requirements for commercially operated small vessels in their waters. Even for private yachts, some flag states (particularly for vessels navigating coastal waters of Mediterranean EU member states) now ask for evidence of annual safety equipment serviceability as part of the annual safety inspection. Engine-hour tracking is the foundational PMS requirement for any motor yacht, regardless of regulatory framework. Main engine manufacturers specify service intervals in hours — not calendar time — for oil changes, filter replacements, heat exchanger cleaning, and impeller inspections. Operating without hour tracking means manufacturer warranty is unverifiable and the operator cannot demonstrate maintenance compliance in the event of a mechanical failure claim. For a typical 15-22m motor yacht, a practical PMS scope covers: main engines (oil, filters, zincs, impellers, belts on interval); generators (parallel intervals to main engines); steering (annual full inspection of hydraulic system and autopilot); sea cocks (full open/close test annually, grease and inspection); safety equipment (life raft service card, EPIRB battery and hydrostatic release, flare expiry dates, extinguisher annual inspection); electrical systems (battery capacity test, bilge pump function test); watermaker (membrane and pre-filter intervals); and hull inspection schedule (antifouling record, shaft seal inspection). APA (Advance Provisioning Allowance) accounting in a charter context should cross-reference the maintenance budget. When unexpected maintenance costs arise mid-charter, understanding whether the task was overdue under the PMS or genuinely unforeseen affects both the financial treatment and the evidence base for any insurance claim. A PMS with accurate cost tracking makes this separation clear.
PMS for Superyachts: Fleet-Scale Maintenance Management
Superyachts operating at 60m and above, or over 500GT, exist in a different operational category from smaller yachts. These vessels typically employ a chief engineer, one or more additional engineers, an electrician, and a full hotel services team. The maintenance demand is correspondingly large — a large superyacht carries a great many individual PMS tasks at different intervals across propulsion, hotel, safety, and deck systems. At this scale, a paper or spreadsheet PMS is not functional. The chief engineer cannot manually track that many task intervals, generate the correct notification list for the next 30 days, and simultaneously maintain the defect log, parts inventory, and dry-dock planning document. Enterprise digital PMS platforms become operationally necessary, not optional. Fleet-scale management adds a further layer. Management companies operating multiple superyachts need cross-vessel visibility into maintenance status. The DPA must be able to review outstanding defects and overdue tasks across all managed vessels without relying on individual captains to forward updates. Remote access to the PMS — in real time, from shore — is a standard expectation for any professional yacht management operation. The integration of PMS with dry-dock and refit planning is one of the highest-value applications of a mature maintenance system. A superyacht entering dry-dock is typically out of service for weeks, depending on scope, and dry-dock costs for a large superyacht are substantial. Every task that enters the dry-dock scope must be justified and planned in advance. A well-maintained PMS provides the forward-looking visibility — deferred tasks, equipment approaching end of service life, class survey items due — that makes efficient dry-dock planning possible. Vessels that arrive at dry-dock with poor PMS records spend the first week generating the work list that should have been prepared over the preceding twelve months. Class society continuous survey arrangements can be linked to the vessel's PMS so that class-related maintenance items are tracked within the same system. When a continuous survey item is completed, the record can be submitted to the class society surveyor digitally, which reduces paperwork and the administrative load on the engineering team. The financial case for a mature PMS in the superyacht sector is strong. Unplanned maintenance — breakdown-driven repairs requiring emergency parts, specialist contractor mobilisation, and lost charter income — typically costs considerably more than the same task performed on a planned schedule with standard lead times for parts. A PMS that prevents even two significant unplanned failures per year delivers a return that far exceeds the cost of the platform and the engineering time to maintain it.
Frequently Asked Questions
Manage Planned Maintenance System (PMS) in HelmOps
Yacht expenses, maintenance, tasks and trips in one place. Records you add offline sync when the connection returns.
Schedule maintenance by engine hours
Hour meter readings drive each service interval. Jobs turn due soon, then overdue, with alerts to the captain and owner.
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