PMS and Class Surveys: How Your Database Prepares You for Inspections

There is a moment every Chief Engineer knows. The surveyor is standing in the engine room, pointing at a piece of equipment, and asking to see its maintenance history. If you can pull that record up quickly, show a complete history with proper intervals, and demonstrate that the work was done — the surveyor moves on. If you cannot, the conversation goes in a different direction.

Class surveys are not a surprise. You know they are coming. The dates are in the vessel's class schedule, published years in advance. And yet, the weeks before a survey still turn into a scramble on far too many yachts — because the PMS database was not built to support the level of scrutiny that surveys demand.

This article covers what surveyors actually look at, how different survey types affect what they check, and how to make sure your database is ready before the surveyor steps onboard.

What class surveyors care about regarding your PMS

Class surveyors are not PMS auditors. Their job is to verify that the vessel meets the structural, mechanical, and safety standards required by the classification society rules. But maintenance records are a significant part of how they do that.

A surveyor's reasoning is straightforward: if the vessel's maintenance records show that equipment has been properly maintained according to manufacturer specifications and class requirements, that is evidence supporting the condition of the equipment. If the records are absent, incomplete, or contradictory, the surveyor has to rely more heavily on physical inspection — and they will look harder.

Good records do not replace physical inspection. But they create confidence. And confidence means the surveyor is less likely to start opening things up that would otherwise have been accepted on the basis of documented maintenance.

Here is what they actually look at:

Maintenance history for surveyed equipment

When a surveyor examines a piece of equipment — a main engine, a generator, a fire pump, a steering gear component — they will typically ask to see the maintenance record. What maintenance has been done? When? Were the manufacturer's recommended intervals followed?

They are looking for consistency. A regular pattern of maintenance at appropriate intervals tells the surveyor that the equipment is being cared for. Gaps in the record, or intervals that do not match what the manufacturer specifies, raise questions.

Running hours and calendar records

For equipment with hours-based maintenance intervals, the surveyor may check the current running hours against the PMS records. If the main engine is showing 8,000 hours and the last major service in the PMS was recorded at 5,000 hours, the surveyor will want to know what happened in the intervening 3,000 hours.

Calendar-based tasks get similar treatment. If a piece of safety equipment has an annual inspection requirement and the last recorded inspection was 18 months ago, that is a finding.

This is why accurate record-keeping matters. Not just completing tasks, but recording them in the PMS with the correct date and running hours. A task done on time but recorded late — or not recorded at all — looks the same as a task not done.

Safety equipment and safety-critical systems

Surveyors pay particular attention to safety-related equipment. Fire detection and suppression systems, emergency generators, bilge pumps, steering gear, navigation equipment, watertight integrity systems — these are not optional maintenance items. They are required to be maintained to specific standards, and the records must demonstrate that they are.

Safety equipment maintenance is often where PMS databases are weakest. The main engines get detailed attention because they are the Chief Engineer's primary concern. But the fire dampers, the emergency lighting, the fixed fire suppression system servicing — these are the items that fall through the gaps when a database is incomplete. And they are exactly the items surveyors check.

Condition of Class items

When a surveyor issues a Condition of Class, it means something needs attention by a specified date. These conditions get recorded in the classification society's records, and the surveyor at the next visit will check whether the condition has been addressed.

If a Condition of Class relates to a maintenance issue — deferred maintenance, a component that needs replacement, a system that needs servicing — your PMS should reflect both the condition and the corrective action taken. The surveyor will look in your system for evidence that the work was completed.

Conditions of Class that are not addressed by the due date are serious. They can affect the vessel's class status, insurance validity, and operational certificates.

Annual, intermediate, and special surveys

Not all surveys are equal. Understanding what each type covers helps you prepare your database appropriately.

Annual surveys

Annual surveys are a general check of the vessel's condition and the maintenance management system. The surveyor reviews the overall state of the vessel, checks that certificates are in order, examines selected equipment, and reviews maintenance records.

For PMS preparation, annual surveys require that your database is current: no major backlog of overdue tasks, completion records up to date, and the equipment register reflecting what is actually onboard.

Annual surveys are the most frequent and typically the least intensive. But they establish a pattern. If every annual survey reveals the same PMS issues — incomplete records, overdue tasks, missing equipment — the surveyor will flag a systemic problem that escalates the scrutiny at the next survey.

Intermediate surveys

Intermediate surveys happen between the special surveys (typically around the two-and-a-half-year mark in a five-year cycle). They are more detailed than annual surveys and focus on specific systems and machinery.

The surveyor will examine main machinery, auxiliary equipment, and safety systems in more detail. They will pull more maintenance records, check more running hours, and look at the condition of equipment more closely.

For PMS preparation, intermediate surveys require that you can demonstrate a consistent maintenance history for all major systems — not just for the last few months, but for the entire period since the last survey.

Special surveys (five-year renewal)

The special survey is the big one. It is a thorough examination of the vessel's structure, machinery, and systems required to renew the vessel's class certificate. It coincides with a major dry-docking and is the most extensive survey the vessel undergoes.

For machinery, the special survey may require opening up equipment that is not normally inspected — main engine crankcases, gearbox internals, thruster seals, shaft bearings. The surveyor needs to verify the condition of components that are normally assessed through maintenance records.

This is where PMS data quality has the biggest impact. A complete maintenance history for the previous five years — showing that all manufacturer-recommended tasks were completed on schedule, that running hours are properly tracked, and that any defects were addressed — gives the surveyor confidence in the overall condition of the machinery. It can reduce the extent of physical opening-up required, which saves time and money during the yard period.

A poor maintenance history does the opposite. If the surveyor cannot verify that maintenance was done, they have to verify the condition by inspection. That means more equipment opened, more components examined, more time in the yard, and more cost.

How to prepare your PMS database before a survey

Preparation should not start the week before the surveyor arrives. For annual surveys, a monthly review of PMS data quality is sufficient. For special surveys, preparation should start at least six months in advance.

Here is a practical approach:

Run an overdue task report

Pull a complete list of every overdue maintenance task. For each one, document why it is overdue and when it will be completed. If a task is overdue because it requires a yard period, note that and confirm it is scheduled for the upcoming dry-dock.

Surveyors accept that some maintenance cannot be done while the vessel is operational. What they do not accept is overdue maintenance with no explanation and no plan.

Verify completion records for critical equipment

Go through every piece of critical machinery — main engines, generators, steering gear, fire pumps, emergency generator, safety equipment — and check that every maintenance task has a complete record for the relevant survey period. If there are gaps, address them now. If maintenance was done but not recorded, add the records with a note explaining the late entry.

Check that equipment in the database matches the vessel

Equipment changes during refits. Pumps get replaced with different models. New systems get installed. Old equipment gets removed. If your PMS database does not reflect the current state of the vessel, the surveyor will find equipment in the engine room that is not in the database, or equipment in the database that is no longer onboard.

Walk the vessel — engine room, steering gear room, deck equipment, safety equipment stations — and cross-reference against the database. Every piece of equipment you can see should have a corresponding entry in the PMS.

Review running hours

Verify that the running hours in your PMS match the actual hours on the equipment. If the main engine hour meter shows 12,450 hours and your PMS last recorded an hours-based task at 11,200 hours, check that any hours-based maintenance due in that interval has been completed and recorded.

Running hour discrepancies are one of the easiest things for a surveyor to spot and one of the hardest to explain away.

Print or prepare key reports

Before the survey, prepare the reports the surveyor is likely to ask for:

• -Equipment register showing all major machinery and safety systems
• -Outstanding/overdue maintenance tasks with reasons and planned completion dates
• -Maintenance history for main machinery covering the survey period
• -Safety equipment maintenance and inspection records
• -Any Conditions of Class and evidence of corrective action

Having these ready means the survey moves quickly. The surveyor asks a question, you hand them a report. No fumbling through the system trying to find the right screen.

Flag state inspections vs class surveys

Class surveys and flag state inspections serve different purposes and are conducted by different authorities, but both will look at your maintenance records.

Class surveys verify compliance with the classification society's rules and standards. They are primarily concerned with the structural and mechanical condition of the vessel.

Flag state inspections verify compliance with international conventions (SOLAS, MARPOL, MLC) and national regulations. They focus on safety management, crew competence, and operational compliance. The ISM Code audit is typically part of the flag state regime.

For PMS purposes, the practical difference is emphasis. Class surveyors focus on machinery condition and maintenance history for equipment they are surveying. Flag state inspectors focus on the maintenance management system as a whole — is it working, is it being used, does it comply with the ISM Code requirements.

Both will check your PMS. But a flag state inspector is more likely to look at the system broadly — checking for overall compliance — while a class surveyor is more likely to go deep on specific equipment.

The good news: a well-built, well-maintained PMS database serves both purposes. The same complete equipment register, accurate maintenance records, and current completion history that satisfies a class surveyor will also satisfy a flag state inspector. You do not need two different systems or two different approaches. You need one good database, kept current.

What happens when records do not match reality

This is the scenario every Chief Engineer wants to avoid.

The surveyor checks the PMS. The database shows the last main engine service was completed 1,000 hours ago. Everything looks good on paper. Then the surveyor opens the crankcase and finds conditions that do not match a recently serviced engine. Excessive carbon buildup, worn bearings, dirty oil — evidence that contradicts the maintenance record.

Now the surveyor has a credibility problem with your entire database. If this record is inaccurate, how many others are? The level of scrutiny increases dramatically. Equipment that might have been accepted on the basis of records now needs physical verification. The survey takes longer, costs more, and may generate findings that would not have existed if the records had been trustworthy.

This scenario does not only happen because of falsified records (though that does happen). It also happens when records are entered retrospectively in bulk — someone goes through the PMS before a survey and marks tasks as complete without verifying the work was actually done. Or when a database was copied from another vessel and the records do not reflect what actually happened on this one.

The lesson: your PMS records need to be accurate. Not complete for the sake of completeness — genuinely accurate. If a task was not done, it should not be marked as done. If it was done late, record the actual date, not the due date. Honest records with some gaps are better than fabricated records that cannot withstand inspection.

How a well-structured database makes surveys straightforward

The difference between a vessel that breezes through surveys and one that struggles is usually not the vessel's condition — it is the quality of the documentation supporting that condition.

A well-structured PMS database gives you:

Fast access to any record. The surveyor asks about a specific piece of equipment. You find it in the hierarchy in seconds, pull up the maintenance history, and show them exactly what they need. No scrolling through flat lists, no searching by keyword, no "give me a minute to find that."

Clear maintenance patterns. A complete history shows regular maintenance at proper intervals. The surveyor can see at a glance that the equipment has been consistently maintained. This builds confidence in the vessel's overall condition.

Traceability. Every task in the database links to a specific piece of equipment, with an interval that traces back to the manufacturer's documentation. The surveyor can verify the source of any maintenance requirement, which demonstrates that the programme is based on proper technical references.

No surprises. When your database is complete, you know the state of every piece of equipment on the vessel. There is no equipment hiding in a corner that is not in the system. There are no tasks that fell through the gaps because the system was not set up to track them.

The pre-survey checklist

For engineers preparing for any class survey or flag state inspection, here is a practical checklist:

• -All equipment in the PMS matches what is actually installed on the vessel
• -No major equipment is missing from the database
• -All maintenance tasks have defined intervals (hours-based, calendar-based, or both)
• -Completion records exist for all tasks due within the survey period
• -Running hours in the PMS match the actual equipment hour meters
• -Overdue tasks are documented with reasons and planned completion dates
• -Safety equipment maintenance records are complete and current
• -Any Conditions of Class have been addressed and documented
• -The engineering team knows how to use the PMS and can demonstrate it to a surveyor
• -Key reports are prepared and ready to present

Work through this list a month before the survey, not the day before. Finding a problem a month out gives you time to fix it. Finding it while the surveyor is waiting does not.

The connection between database builds and survey readiness

We build databases with surveys in mind from the start. Every equipment entry, every maintenance task, every interval is structured to support the level of scrutiny that class and flag state inspections demand.

That means complete equipment hierarchies where every piece of machinery and safety equipment has its place. It means maintenance tasks extracted from actual OEM documentation with intervals that match what the manufacturer specifies. It means a structure that allows the Chief Engineer to pull up any record quickly and confidently.

If your vessel has a survey approaching and your PMS database is not giving you confidence, it is worth addressing that before the surveyor arrives — not during the survey. Our [services page](/services) covers what we do, and our article on [ISM Code requirements for your PMS](/blog/ism-code-pms-requirements-superyacht) explains the regulatory framework that underpins everything surveyors check.

A well-built database does not guarantee a clean survey. But it removes the most common source of findings: incomplete, inaccurate, or inaccessible maintenance records. And that puts you in the strongest possible position when the surveyor steps onboard.