Lifeboat hook rule: SOLAS III/1.5 and MSC.320(89)

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For years, the most dangerous part of a lifeboat was the device meant to set it free. In the MAIB’s ten-year review, hook failures caused 7 of the 12 lifeboat deaths on UK ships. The investigators described the pattern: on-load hooks had become over-complicated, crews often did not understand how they worked, and once a hook was not fully reset, the weight of the boat itself could drive it open. Sometimes only one hook opened; the attachment at the other end was often torn away, and the boat dropped into the water, sometimes upside down.

The IMO’s answer, adopted in 2011, was the hook rule: a new design standard for release mechanisms and a deadline by which every non-compliant hook on every ship had to be replaced. The deadline passed on 1 July 2019, but the rule still shapes every inspection of release gear today.

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In this lesson

Try it: A release gear question during your first week as chief officer
In plain words
In detail
What the rules say
Flag and class notes
Key numbers
What inspectors find
Questions people ask
Quiz: 6 questions

Sources

1 IMO Resolution MSC.317(89), Amendments to SOLAS 1974 (adopted 20 May 2011, in force 1 January 2013), Annex: regulation III/1.5. https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.317(89).pdf
2 IMO Resolution MSC.320(89), Amendments to the LSA Code (adopted 20 May 2011, in force 1 January 2013), Annex: paragraph 4.4.7.6. https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.320(89).pdf
3 IMO Resolution MSC.554(108), Amendments to the LSA Code (adopted 23 May 2024, in force 1 January 2026), Annex, paragraphs 4.4.7.6.8 and 4.4.7.6.17. https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.554(108).pdf
4 IMO MSC.1/Circ.1584, Amendments to the Guidelines for evaluation and replacement of lifeboat release and retrieval systems (MSC.1/Circ.1392) (20 June 2017), Annex, paragraph 21. https://wwwcdn.imo.org/localresources/en/OurWork/Safety/Documents/MSC.1-Circ.1584.pdf
5 IMO Resolution A.1207(34), Survey Guidelines under the HSSC, 2025, Annex, paragraph (EA) 1.2.1.16. https://wwwcdn.imo.org/localresources/en/OurWork/IIIS/Documents/A%2034-Res.1207%20-%20SURVEY%20GUIDELINES%20UNDER%20THE%20HARMONIZED%20SYSTEMOF%20SURVEY%20AND%20CERTIFICATION%20(HSSC),%202025%20(Secretariat).pdf
6 IMO Resolution MSC.402(96), Requirements for maintenance, thorough examination, operational testing, overhaul and repair (in force 1 January 2020), Annex, paragraph 6.2.4. https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.402(96).pdf
7 BG Verkehr, Ship Safety Division (German flag), ISM-Circular No. 04/2011, Assessment of on-load release and retrieval mechanism and procedures for the defined exchange program (22 August 2011). https://www.deutsche-flagge.de/de/redaktion/dokumente/ism-rundschreiben/Circ2011_4_engl.pdf
8 Liberia Maritime Authority, Marine Notice SAF-005 (Rev. 07/26), paragraph 4.5. https://www.liscr.com/sites/default/files/online_library/SAF-005.pdf
9 The Bahamas Maritime Authority, Marine Notice 82, Lifeboat Safety, version 1.1, paragraph 8.4 and section 11. https://www.bahamasmaritime.com/wp-content/uploads/2023/10/MN082-Lifeboat-Safety.pdf
10 UK Marine Accident Investigation Branch, Safety Study 1/2001, Review of lifeboat and launching systems’ accidents, sections 1.4 and 2.1. https://assets.publishing.service.gov.uk/media/5a7d8042ed915d2d2ac0954a/Lifeboat_Study.pdf
11 American Bureau of Shipping, Brief: MSC 111 (22 May 2026), unified interpretation of paragraphs 4.4.7.6 and 4.7.7 of the LSA Code (MSC.1/Circ.1529/Rev.1). https://ww2.eagle.org/content/dam/eagle/regulatory-news/2026/abs-msc111-brief.pdf

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