The four grounds that open a detailed port State inspection and the detention threshold (MLC Regulation 5.2.1)
2026-07-17

When a port State officer comes on board, how far the inspection goes is not settled in advance. There are several doors and they open in order. MLC, 2006 Regulation 5.2.1 and Standard A5.2.1 attach a condition to each one. This article follows the order in which they open.
The first door closes at a review of the certificate
- Each Member shall accept the maritime labour certificate and the declaration of maritime labour compliance required under Regulation 5.1.3 as prima facie evidence of compliance with the requirements of this Convention (including seafarers’ rights). Accordingly, the inspection in its ports shall, except in the circumstances specified in the Code, be limited to a review of the certificate and declaration.
The maritime labour certificate and the declaration of maritime labour compliance are accepted
as prima facie evidence. So an inspection in port ends, as a rule, at a review of those two
documents.
There is one further limit on scope. The inspection is limited to verifying conformity with the requirements set out in the Articles and Regulations of the Convention and in Part A of the Code only. Part B is guidance and is not on its own a basis for a finding.
Four doors lead through to a detailed inspection
| Ground | What it covers |
|---|---|
| (a) | The required documents are not produced or maintained, are falsely maintained, do not contain the information the Convention requires, or are otherwise invalid |
| (b) | There are clear grounds for believing the working and living conditions on the ship do not conform to the requirements of the Convention |
| (c) | There are reasonable grounds to believe the ship has changed flag to avoid compliance with the Convention |
| (d) | There is a complaint alleging that specific working and living conditions on the ship do not conform |
To this point it is may. A detailed inspection is permitted, not required. But a condition at
the end of the same paragraph makes it required.
Such inspection shall in any case be carried out where the working and living conditions believed or alleged to be defective could constitute a clear hazard to the safety, health or security of seafarers or where the authorized officer has grounds to believe that any deficiencies constitute a serious breach of the requirements of this Convention (including seafarers’ rights).
Where the conditions believed or alleged to be defective could be a clear hazard to seafarers’ safety, health or security, or where the officer has grounds to believe the deficiencies are a serious breach. At that point the discretion is gone.
Which ground opened it sets how wide the detailed inspection runs
A detailed inspection opened under (a), (b) or (c) shall in principle cover the matters listed in Appendix A5-III. One opened under (d) works differently.
- In the case of a complaint under paragraph 1(d) of this Standard, the inspection shall generally be limited to matters within the scope of the complaint, although a complaint, or its investigation, may provide clear grounds for a detailed inspection in accordance with paragraph 1(b) of this Standard.
An inspection opened by a complaint is generally held inside the scope of that complaint. But where the complaint, or investigating it, produces clear grounds under (b), the scope widens. The route from a narrow start to a wide inspection is drawn in the provision itself.
Who may complain is defined as well: a seafarer, a professional body, an association, a trade union or, generally, any person with an interest in the safety of the ship, including an interest in safety or health hazards to seafarers on board.
Findings go to the master with a deadline attached
Where non-conformities are found, the officer forthwith brings them to the master’s attention with required deadlines for their rectification. Where the officer considers them significant, or where they relate to a complaint, the list of recipients grows. The officer brings them to the attention of the seafarers’ and shipowners’ organizations in the country where the inspection took place, may notify a representative of the flag State, and may provide the competent authorities of the next port of call with the relevant information.
The last item carries weight in practice. It means the findings on this ship can be waiting at the next port before the ship is.
The detention threshold forks two ways, and a plan of action opens it
the authorized officer shall take steps to ensure that the ship shall not proceed to sea until any non-conformities that fall within the scope of subparagraph (a) or (b) of this paragraph have been rectified, or until the authorized officer has accepted a plan of action to rectify such non-conformities and is satisfied that the plan will be implemented in an expeditious manner.
The two branches are conditions on board that are clearly hazardous to seafarers’ safety, health
or security, and non-conformity that constitutes a serious or repeated breach of the
requirements. repeated is in there, so findings that are not serious on their own reach this
threshold once they recur.
Two routes open the door: rectify the non-conformities, or have the officer accept a plan of action to rectify them and be satisfied it will be implemented expeditiously. Where the ship is prevented from sailing, the officer forthwith notifies the flag State, invites a representative of the flag State to be present if possible, and requests a reply within a prescribed deadline.
Guidance on what circumstances justify detention sits in Part B of the Code. The Part B that cannot be used as a basis for a finding is named in the provision as guidance for the detention judgement.
Worth confirming
The passages above come from printed pages 93 to 96 of the consolidated MLC, 2006 (including the 2022 amendments). Opening a detailed inspection and detaining a ship are the port State officer’s judgements, and those judgements run alongside the procedures of the regional memorandum the port State belongs to. Whether the certificate and declaration on that ship are valid, whether findings from the last inspection travelled to the next port, and whether anything remains that could read as a repeated finding are where the actual judgement starts.
When a detailed inspection opens, what gets asked for is rest hours, employment agreements, wages and certificates. Bellbook holds these per seafarer on board and shows the same screen ashore, so they come up where they are asked for.
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