Port State Control: How to Avoid Detention — Top Deficiencies and How to Prevent Them

A detention is rarely a surprise. The Port State Control Officer usually documents what the ship's staff already knew: a fire door that no longer closes, an on-load release hook whose test was never recorded, an engine room log that does not match actual running hours. PSC does not create the problem — it makes it public, and it puts a price on it.

The Paris MoU figures for 2025 show the scale of the exercise: 16,474 inspections, 51,797 deficiencies recorded, 688 ships detained — a detention rate of 4.18%, rising for the third consecutive year. Almost six inspections in ten end with at least one deficiency, so a clean report is the exception, not the rule.

The encouraging part is that the distribution of deficiencies is remarkably stable year after year and region after region. Behind each family sits the same root cause: maintenance carried out but not recorded, a due date tracked on a spreadsheet, a corrective action never closed out. Here is how PSC actually works, and how a maritime CMMS turns daily work into defensible evidence of compliance.

How Port State Control works

A ship calling at a foreign port may be inspected by that State's authorities against the international conventions: SOLAS, MARPOL, MLC 2006, STCW, Load Lines, COLREG, BWM. The Flag State remains primarily responsible, but PSC is the safety net catching Flag and Recognised Organisation failures.

Regime	Coverage	2025 volume	2025 detentions	Distinctive feature
Paris MoU	Europe, North Atlantic, Canada	16,474 inspections	688 (4.18%)	New Inspection Regime, THETIS database, White/Grey/Black flag lists, banning
Tokyo MoU	Asia-Pacific	35,546 inspections	1,255 (3.53%)	Largest inspection volume worldwide, joint campaigns with the Paris MoU
USCG	United States	8,999 PSC exams	77 (0.85%)	Own targeting matrix, QUALSHIP 21 and E-Zero incentive programmes

The other memoranda (Viña del Mar, Indian Ocean, Mediterranean, Abuja, Black Sea, Caribbean, Riyadh) use the same architecture. Results are shared: a deficiency raised in Rotterdam is visible in Genoa before you have even sailed.

The Ship Risk Profile

The Paris MoU applies the New Inspection Regime, which replaced blanket quotas with targeting based on the Ship Risk Profile. Every ship is rated High Risk (HRS), Standard Risk (SRS) or Low Risk (LRS) from generic and historic parameters:

• Ship type — oil, chemical and gas tankers, bulk carriers and passenger ships are treated as inherently higher risk.
• Age — the 12-year threshold is decisive.
• Flag State performance — White, Grey or Black list over a three-year rolling period.
• Recognised Organisation performance acting on behalf of the Flag.
• ISM company performance, calculated across the whole managed fleet: companies rated low or very low are published by name.
• 36-month inspection history — deficiencies per inspection and detentions.

The profile is recalculated daily. A detention therefore penalises more than the ship involved: it degrades the ISM company's performance and with it the risk profile of every vessel under that DOC. Many owners and managers underestimate this.

Priority I, Priority II and overriding factors

The profile sets the window between periodic inspections: 5 to 6 months for High Risk ships, 10 to 12 months for Standard Risk, 24 to 36 months for Low Risk. A ship arriving after its window has expired is Priority I and must be inspected; within the window it is Priority II and inspection is discretionary.

Two categories of event force an unscheduled inspection: overriding factors (collision, grounding, illegal discharge, class suspension, a report from a pilot or port authority) and unexpected factors (a crew complaint, reported damage, manifestly unsafe operation). A significant part of your PSC exposure is therefore manageable.

How an inspection unfolds

Initial inspection

The PSCO starts with documents: statutory certificates and equipment record sheets, class survey reports, the Minimum Safe Manning Document, deck and engine logs, the Oil Record Book. He or she then checks the ship's overall condition and hygiene, and whether previous deficiencies were rectified. An unendorsed certificate, a fire control plan missing from the external container, or a dirty galley constitute clear grounds: reasonable evidence that the ship does not comply.

More detailed inspection

Triggered by clear grounds, it digs into the suspect areas and samples others at random. The PSCO moves from documentary to functional verification: emergency generator start, emergency fire pump test, remote closing of ventilation flaps, abandon-ship drill with a boat lowered, general alarm test. It also covers the human element: ISM implementation, STCW certification, hours of rest and MLC 2006 conditions.

Expanded inspection

Mandatory for all High Risk ships, and for oil, chemical, gas and NLS tankers, bulk carriers and passenger ships over 12 years old. It follows a predefined list of risk areas per ship type and typically takes a full day, operational controls included: the PSCO wants to watch the crew perform, not read the procedure.

Concentrated Inspection Campaigns

Every year from September to November, a themed questionnaire is added to the normal inspection. Paris and Tokyo MoUs now coordinate their campaigns — the 2025 CIC addressed the BWM Convention, where the Tokyo MoU recorded a tripling of related deficiencies. Topics are announced in advance, so there is no excuse for being unprepared.

The most frequent deficiency families

Family	Share of deficiencies (Paris MoU 2025)	Dominant maintenance root cause
Fire safety (SOLAS II-2)	16.8% — 8,713	Rounds not recorded, hot work not signed off
Structure and electrical (SOLAS II-1)	11.6% — 6,004	No condition monitoring, corrosion handled reactively
Health, protection and welfare (MLC Title 4)	10.1% — 5,225	Accommodation outside the maintenance plan
Life-saving appliances (SOLAS III)	9.3% — 4,815	Service-provider due dates not anticipated
Safety of navigation (SOLAS V)	7.6% — 3,952	Chart and software updates not tracked
ISM Code	4.5% — 2,322	Audit non-conformities never closed out

Documents and certificates

Expired or unendorsed certificates, equipment record sheets not updated after a liferaft replacement, no DOC copy on board, a Safe Manning Document that does not match the crew carried. Root cause: due dates tracked on a spreadsheet, with no alerts and no link to the physical equipment. A Certificates module attaches every document to the ship or equipment, with alerts at 90, 60 and 30 days.

ISM Code

The most serious family, because it challenges the system rather than a component: a PMS that exists but whose jobs are not recorded, audit non-conformities without a closed corrective action, damage reports that never reach the DPA, an outdated critical equipment inventory. Root cause: a well-written SMS that is not instrumented. A PSCO finding three unrelated technical deficiencies will conclude the SMS has failed — and a major ISM deficiency is detainable in its own right, as covered in our article on the ISM Code and maintenance compliance.

Fire safety

The largest family in both hemispheres: fire doors wedged open or with degraded seals, seized ventilation flaps, bulkhead penetrations left unsealed after hot work, uninspected extinguishers, holed hoses, blocked CO2 release controls, expired EEBDs. Root cause: fire rounds are carried out but not recorded, and steelwork or cabling jobs do not trigger re-inspection of the divisions they cross. Every penetration should raise an integrity check task in the maintenance plan.

Life-saving appliances

Overdue annual or five-yearly servicing, on-load release hooks not tested in accordance with MSC.1/Circ.1206, corroded davits or falls not renewed, expired lights and pyrotechnics. Root cause: these due dates depend on approved service providers and require port planning. Pyrotechnics expiring three days before Rotterdam is not bad luck but poor anticipation: linking service due dates to the Purchasing module triggers the order and the attendance request with real lead time.

Propulsion, auxiliary machinery and electrical installations

Oil and fuel leaks, exhaust lagging soaked in hydrocarbons, an emergency generator that will not start, defective bilge alarms, an untested emergency steering changeover, seized quick-closing valves. Root cause: a plan driven purely by running hours, with no parameter readings. Condition-based logic — exhaust temperatures, oil analysis, vibration — detects drift before failure, as described in moving from corrective to condition-based maintenance; a Counters module raises jobs on actual readings.

MARPOL and pollution prevention

A 15 ppm separator with an inoperative alarm or inconsistent with the Oil Record Book, an altered ORB, a SOPEP with obsolete contacts, sulphur non-compliance, a Ballast Water Record Book contradicting the BWM plan. Root cause: the gap between equipment and paperwork — a MARPOL deficiency becomes a criminal matter as soon as the record does not reflect reality. Automatically reconciling tank soundings, running hours and record book entries removes that inconsistency.

Living and working conditions (MLC 2006)

The third largest family at the Paris MoU: missing or unsigned Seafarers' Employment Agreements — a recurring detainable item — non-compliant hours of rest, late wages, degraded accommodation. Root cause: accommodation is almost never in the maintenance plan, though it should be — cabin ventilation, galley extraction, calorifiers, food refrigeration. A Crew module centralises contracts, certificates, medicals and hours of rest with the same expiry alerts as the ship's certificates.

Safety of navigation

Uncorrected charts and publications, expired ENC cells or ECDIS software versions, non-compliant backup arrangements, BNWAS not engaged, an overdue VDR annual performance test. Root cause: digital updates are not treated as maintenance. Yet an obsolete ECDIS software version is handled by PSC exactly like an uncorrected paper chart.

Pre-arrival preparation checklist

Work through it 72 hours before arrival, then revalidate the day before. Every line must be supported by a dated record, not by a verbal assurance.

Documents and certificates

• Statutory certificates valid, endorsed, originals on board.
• Equipment record sheets consistent with the equipment actually fitted.
• Company DOC and ship SMC valid; DOC copy on board.
• Safe Manning Document matching the crew carried.
• Last two PSC reports with evidence that every deficiency was closed.

Fire safety

• Fire doors: free closing, sound seals, holdback devices released.
• Ventilation flaps, dampers and emergency stops operated and recorded.
• Extinguishers and hoses: annual check current, pressure test completed.
• Emergency fire pump tested from cold start.
• Fixed system: controls free, release alarm tested, cabinet accessible.
• Detection: loop test documented, no detector isolated without justification.
• EEBDs, SCBA sets and fireman's outfits: in date, cylinders full.
• Fire control plans current, including the external container.

Life-saving appliances

• Annual and five-yearly servicing of boats, rafts and davits up to date.
• On-load release hooks: operational test documented.
• Davit falls renewed or end-for-ended on schedule.
• Lifeboat engines: load test, fresh fuel, charged battery.
• Pyrotechnics, EPIRB, SART, GMDSS portables and lifejackets: dates and quantities.
• Abandon-ship and fire drills of the last three months logged.

Machinery and electrical

• No visible oil or fuel leaks; exhaust lagging clean and intact.
• Emergency generator: automatic and manual starts tested.
• Emergency lighting and transitional power supply tested.
• Quick-closing valves and remote emergency stops operated.
• Steering gear: emergency changeover and bridge-engine room communication tested.
• Bilge alarms functional, no alarm inhibited, bilges clean and dry.

MARPOL

• 15 ppm separator: alarm and three-way valve tested, no unauthorised connections.
• Oil Record Book parts I and II complete, consistent, no erasures.
• Garbage Record Book, garbage management plan and SOPEP current.
• Compliant fuel, bunker delivery notes and sealed samples retained.
• Ballast Water Record Book consistent with the plan and actual system operation.

MLC 2006 and crew

• Seafarers' Employment Agreements signed and available to each seafarer.
• Hours of rest records compliant, posted, consistent with watch schedules.
• Wage accounts and proof of payment available.
• Medical certificates, certificates of competency and endorsements valid.
• Accommodation, sanitary spaces, galley and cold rooms clean and sound.

Navigation

• Charts and publications corrected up to the latest notice received.
• ECDIS: valid ENC cells, current software version, compliant backup.
• VDR annual performance test in date.
• Navigation lights, whistle and sound signals tested; BNWAS engaged.
• Berth-to-berth passage plan signed by the Master.

What triggers a detention, and what it costs

A deficiency is detainable when the PSCO judges that the ship cannot proceed to sea without danger to itself, its crew or the environment: is the relevant equipment operational, and can the crew use it in an emergency?

In 2025 the Paris MoU recorded 4,744 detainable deficiencies for 688 detentions, so a detention typically results from several converging findings rather than one fault. An accumulation of "minor" items across unrelated areas eventually produces an ISM conclusion — the SMS is not working — which is detainable in itself.

• Immediate delay — from 24 hours to several weeks if a part must be shipped in or a class survey arranged.
• Direct cost — extra port charges, overtime, express freight, service engineers, demurrage.
• Commercial cost — charter party breach, penalties, lost berth window: almost always the heaviest item.
• Risk profile damage — the detention enters the ship's 36-month history and the ISM company's performance, affecting every vessel under management.
• Banning (refusal of access) — in the Paris MoU region, a Black-listed flag ship is banned after three detentions in 36 months, a Grey-listed flag ship after three detentions in 24 months. Minimum three months for a first ban, twelve for a second, twenty-four for a third, then permanent. Changing flag, company or name does not clear it: 19 ships were banned in 2025.
• Reputation — detentions are published by name, with ship, flag, ISM company and RO. Charterers, insurers and vetting inspectors all read them.

Key takeaway — PSC does not penalise the absence of maintenance; it penalises the absence of evidence of maintenance. Work that was done perfectly but never recorded, dated and signed does not exist as far as a PSCO is concerned. Conversely, a minor deficiency supported by an open work order, a part on order and a documented compensating measure very often ends as rectification at the next port rather than a detention.

How a CMMS documents proof of compliance

A PSCO has a few hours and cannot check everything, so he samples. If the first three samples return immediate, consistent, dated information, he concludes the system works and lightens the inspection. If they trigger a search through folders, he digs. A maritime CMMS works on that dynamic first.

Time-stamped job history

Every completed job produces a record: equipment, date and time, technician, time spent, spares consumed, readings, photographs. On a critical item — emergency fire pump, emergency generator, steering gear — the PSCO may ask for twelve months of history. The answer must appear in seconds on the chief engineer's tablet, including offline, as covered in our article on the digital engine room log book.

Certificate and service due dates

Statutory certificates, class surveys, service attendances, calibrations, medicals and crew certificates sit in a single register with cascading alerts and a consolidated fleet view ashore. The point is not to know that a certificate expires, but to trigger early enough the purchase order, the attendance request and the choice of a suitable port.

Approved maintenance plans and critical spares

Where the planned maintenance system is approved by class (PMS class scheme), the CMMS must mirror exactly the approved scope, intervals and tolerances, and flag overdue jobs. A structured equipment hierarchy demonstrates coverage of a critical item instantly — the method is set out in our guide to building an effective preventive maintenance plan in four steps. And since a deficiency that cannot be rectified for want of a part becomes a detention, inventory traceability with minimum stock alerts on critical spares is direct insurance against immobilisation.

Internal audit reports

The ISM Code requires internal audits and documented handling of non-conformities, accidents and hazardous occurrences. Each non-conformity must carry a cause analysis, a corrective action, an owner, a due date and evidence of closure. Linking it to the corrective maintenance job produces the chain of evidence a PSCO tries to reconstruct.

Closing the improvement loop

Rectifying a deficiency is not enough. What separates a fleet that climbs out of the High Risk category is the ability to prevent recurrence.

1. Analyse the root cause. A wedged fire door is not a door problem: it is an operational constraint, a missing round, or hot work never signed off. Five Whys is sufficient, provided it is applied with the crew rather than from the office ashore.
2. Separate corrective from preventive. Repairing the door is corrective. Adding a quarterly round of all fire doors with photographic evidence, plus an automatic integrity check after any bulkhead penetration, is preventive. Only the second reduces the deficiency rate.
3. Assign, schedule, close out. An action with no named owner and no date is not an action; an action closed without evidence is not closed.
4. Measure. A handful of indicators on a dashboard is enough: deficiencies per inspection, overdue preventive jobs, non-conformity closure time, share of reactive work. An overdue-PM rate above 10% reliably predicts a difficult inspection.
5. Look ahead to the next call. A Forecast module projects maintenance workload and due dates over coming weeks, so work is aligned with the real port rotation instead of being caught up alongside.

FAQ

Can I refuse a Port State Control inspection?

No. A ship calling at a port of a party State implicitly accepts the control. Sailing without authorisation after a detention is penalised in the Paris MoU region by immediate banning from every port in the region. The Master may, however, appeal a detention to the port authority and then to the Flag State.

How long does a detention last?

A fault rectifiable with ship's resources is typically cleared in 24 to 72 hours including re-inspection. Damage requiring a part to be shipped in, an approved service provider or a class survey commonly means one to several weeks alongside. The limiting factor is almost always supply, not repair.

Is a PSC deficiency automatically an ISM non-conformity?

Not automatically, but it must be handled as a signal within the safety management system. The ISM Code requires non-conformities to be recorded, their causes analysed and corrective action implemented. In practice a well-run company raises an internal non-conformity for every PSC deficiency: that is what the next auditor and the next PSCO will look for.

How do we move out of the High Risk category?

Some parameters are outside your control (ship type and age, Flag and RO performance); others are directly manageable: deficiencies per inspection over 36 months, detentions, and ISM company performance. That is the only genuinely actionable lever, and its effect is measured over several inspections, not a single call.

Will inspectors accept a CMMS as proof of compliance?

Yes, provided records are time-stamped, attributable to an identified person, not retrospectively editable, and available on board during the inspection. That is why offline capability matters: inspections often take place in the engine room, with no connectivity. Many Flag States also accept electronic log books subject to prior approval — always check your Flag's requirements.

What if I disagree with a recorded deficiency?

Have it recorded precisely on Form B with its action code and ask for the exact regulatory reference; the Master may add written comments. Appeals go through the port authority and then the Flag State. In all cases the appeal does not suspend the detention: rectify first, contest afterwards.

Conclusion

Port State Control is predictable: the deficiency families do not change, targeting criteria are published, campaign topics are announced in advance and detention criteria are documented. What varies from ship to ship is not luck, but the ability to produce — in seconds, without connectivity — dated evidence that the work was done.

That cannot be improvised the night before arrival. It is built on a clean equipment hierarchy, a maintenance plan that is actually executed, due-date tracking that triggers purchase orders rather than reminders, and a non-conformity loop that closes with evidence. That is what Smart Sailors, designed by seafarers and deployed on more than 400 vessels, brings to both ship and office.

Approach your next port call with confidence. Book a demo or start your 30-day free trial. Questions about your fleet setup? Talk to our team, and find every term used here in our maritime glossary.