How an inspection actually unfolds
A PSC inspection starts as an initial inspection. The officer verifies the certificates and documents and forms a view of the ship's overall condition, from the gangway and mooring decks to the engine room. If there are clear grounds to believe that the ship, its equipment or its crew do not substantially meet the requirements, the officer moves to a more detailed inspection of the areas concerned. Certain ship types and higher risk profiles are also subject to expanded inspection on a fixed periodicity. The recurring focus areas are consistent across regions and across years. Fire safety, meaning doors, dampers and fixed systems. Life-saving appliances, meaning lifeboats, launching arrangements and hydrostatic release units. ISM implementation. MLC living and working conditions, including accommodation, food, medical care, wages and rest hours. MARPOL equipment such as the oily water separator, and the record books that go with it. Safety of navigation, from passage planning to chart and publication updates. Deficiencies are coded and recorded. Most carry a rectification timeframe. The serious ones, where the ship is unsafe to proceed to sea, become grounds for detention. Once a detention is registered in the regional database it follows the ship, the company and the flag.
Targeting: why some ships are inspected more
Inspections are not random. The Paris MoU calculates a Ship Risk Profile, and the Tokyo MoU runs an equivalent under its New Inspection Regime. Both build the score from the same kinds of input: ship type and age, the performance of the flag, the performance of the recognized organization, the company's performance under the ISM Code, and the ship's own deficiency and detention history. Higher risk ships are inspected more often and more deeply. The scoring is cumulative, so the ship's own inspection history feeds back into its profile, and a lower risk profile carries a longer interval to the next inspection and a narrower scope.
The Concentrated Inspection Campaign
In recent years the Paris and Tokyo MoUs have run a joint Concentrated Inspection Campaign on a single topic from 1 September to 30 November, applying a dedicated questionnaire alongside the routine inspection. A ship is covered by one inspection under the campaign during the period, per MoU. The 2025 campaign covered ballast water management. As at August 2026 the announced topic for the 2026 campaign, running from 1 September to 30 November 2026, is cargo securing. The topic is announced in advance, which makes it one of the few genuinely predictable events in the inspection year. A ship that works through the announced questionnaire before September enters the campaign season with the answers already prepared.
Readiness is a documentation discipline
The fastest way to fail an inspection is a gap between what the paperwork says and what the ship shows. Readiness means reconciling three things: the certificates, the supporting records (oil record book entries, rest hour logs, drill records, maintenance history) and the physical condition of the vessel. Then resolving the differences before arrival, not at the rail. A pre-arrival review that covers the full set of relevant records, rather than a sample of them, identifies findings you can close before arrival and turns them into a prioritized close-out list for the crew and the office. The discipline matters because inspectors are trained to pull the thread. One inconsistent entry invites a deeper look at everything around it.
Close the loop, do not just log it
Finding a deficiency is only useful if it is corrected, verified and fed back into the safety management system. Track each item from open to closure with evidence. Then ask why the system allowed it to exist at all. That is what turns a one-off inspection into a documented improvement record, and it is the deficiency and detention history that the regional regimes score.
What a detention actually costs
A detention is rarely just lost port time. It can trigger off-hire under the charterparty, disrupt schedules and cargo commitments, and raise the ship's risk profile so that the next ports inspect harder. It weighs on the company's ISM performance record and on the flag's standing in the regional list. In the Paris MoU region the consequences escalate formally. A ship flying a black list flag can be refused access after three detentions in a rolling 36 months. For a grey list flag the threshold is three detentions in 24 months. A ship that sails in breach of a detention, or fails to call at the agreed repair yard, can be banned outright. Set against that, finding and fixing issues before arrival is almost always the cheaper path, and it is entirely within the operator's control.