The rulebook map

Lifeboat rules are spread over several documents, and that confuses a lot of people. The good news is that each document has one job.

SOLAS chapter III is the law. It says what a ship must carry, how often the crew must drill, and when the boats must be checked and tested. The LSA Code says how a lifeboat, its hooks and its davit must be built. Resolution MSC.402(96) says how servicing must be done and who may do it.

Around these sit IMO circulars, which give guidance, and notices from the flag state, which add that country’s own rules. Classification societies approve service firms. The manufacturer’s manual tells you exactly how to look after your own boat.

Once you know which document does which job, you can find any answer quickly and check what people tell you.

Layer 1: SOLAS chapter III, the law

SOLAS is the International Convention for the Safety of Life at Sea. Chapter III covers life-saving appliances and arrangements. The current chapter was adopted by resolution MSC.47(66) on 4 June 1996 and came into force on 1 July 1998. It has been amended many times since.

The regulations you will use most:

Two of these do most of the daily work. Regulation 19 sets the drills, including the rule that “each lifeboat shall be launched, and manoeuvred in the water by its assigned operating crew, at least once every three months during an abandon ship drill” (SOLAS III/19.3.4.3). Regulation 20 sets the checks: weekly (20.6), monthly (20.7), falls (20.4), and the annual and five-yearly thorough examinations (20.11).

Watch the numbering. In 2015 regulation 19 was renumbered when enclosed space drills were added (MSC.350(92)). The abandon ship drill moved from 19.3.3 to 19.3.4. Older books and checklists still use the old numbers.

The full consolidated SOLAS is an IMO sales publication. The amending resolutions are free on the IMO website, and the links in this course point to those.

Layer 2: the LSA Code, how things are built

The International Life-Saving Appliance (LSA) Code was adopted by resolution MSC.48(66) and became mandatory with the new chapter III on 1 July 1998. SOLAS says what a ship must have; the LSA Code says what that equipment must be like.

The Code is amended by MSC resolutions under SOLAS III/3.10. Each amendment is adopted on one date and comes into force later. For example, MSC.320(89), which tightened the hook rules, was adopted on 20 May 2011 and came into force on 1 January 2013. Many amendments apply only to equipment “installed on or after” a date, so an older boat may legally follow an older version.

Layer 3: MSC.402(96), how servicing is done

Resolution MSC.402(96) was adopted on 19 May 2016. Resolution MSC.404(96), adopted the same day, changed SOLAS III/3 and III/20 so that MSC.402(96) became mandatory on 1 January 2020. SOLAS III/20.11.5 says the thorough examinations, tests, overhauls and repairs “shall be carried out in accordance with” these requirements.

MSC.402(96) is short and worth reading in full. Its sections:

It has been amended by MSC.559(108), which added the ventilation system to the annual examination from 1 January 2026.

Layer 4: testing standards

Resolution MSC.81(70) is the “Revised Recommendation on testing of life-saving appliances”. It covers the prototype tests a design must pass before approval, and the production and installation tests. It has been amended several times, including by MSC.321(89) for the new hook tests. These are tests for manufacturers and approval bodies, not the tests a ship does in service.

Layer 5: IMO circulars, guidance

Circulars (named MSC.1/Circ.…) explain, interpret or give guidance. They are not mandatory by themselves, although a flag state can make them so. Panama, for example, says some of them apply “only as recommendation” (MMC-258). The ones that matter for lifeboats:

Layer 6: flag notices

Each flag state applies the IMO rules in its own way. Flag notices say which service providers are accepted, whether a surveyor must attend, and any extra rules. Liberia (Marine Notice SAF-005), the Marshall Islands (MN 2-011-37), Panama (MMC-258) and the Bahamas (MN 82) all publish detailed notices. Always read your own flag’s current notice.

Layer 7: class and the manufacturer

Classification societies survey the ship on behalf of many flags, and approve service firms. IACS Unified Requirement Z17, Annex 1 §13, sets how class approves lifeboat service firms “for each make and type of equipment”.

Last, and on board every day: the manufacturer’s manual. MSC.402(96) §6.1 says all work follows the manufacturer’s manuals and that a full set must be on board. SOLAS III/36 lists what the on-board maintenance instructions must include.

Which document answers which question

How MSC.402(96) became law

A resolution like MSC.402(96) is not part of SOLAS by itself. MSC.404(96) added a definition to SOLAS: III/3.25 defines the “Requirements for maintenance, thorough examination, operational testing, overhaul and repair” as those adopted by MSC.402(96), “as may be amended”. It also rewrote III/20.11 to require the work to follow them. That is why later amendments to MSC.402(96), such as MSC.559(108) and MSC.590(111), become mandatory too.

“Installed on or after”

Many LSA Code amendments apply to equipment by installation date, not by ship age. MSC.535(107), on ventilation of totally enclosed lifeboats, explains what “installed” means: for ships contracted on or after 1 January 2029, any installation; for other ships, a contractual delivery date of the equipment, or the actual delivery date, on or after 1 January 2029. A new boat fitted to an old ship can therefore fall under the new rules.

Old numbers in old documents

Company checklists and manuals are often older than the latest amendment. When a document cites a SOLAS or LSA Code paragraph, check which version it was written against. Two common traps: the abandon ship drill paragraphs of regulation 19 moved in 2015 (MSC.350(92)), and lifeboat release mechanism sub-paragraphs in LSA Code 4.4.7.6 were renumbered by MSC.320(89), adopted in 2011.

Interpretations

Some questions are answered by Unified Interpretations. MSC.1/Circ.1618, on SOLAS chapter III, is reported by class societies to read regulation 20.11 so that the five-yearly work is done in the presence of a surveyor. IACS also issues unified interpretations, such as UI SC 267 on the corrosion resistance of release mechanisms.