SOLAS Chapter III: Life-Saving Appliances and Arrangements

Background

Scope and structure of Chapter III

Chapter III implements the survival side of the SOLAS architecture: when fire (Chapter II-2), flooding (Chapter II-1) or other casualty has reached a state where the ship is no longer a safer place than the sea, Chapter III governs the equipment and procedures by which the people on board can survive and be rescued.

The chapter is built around three layered objectives:

• Stay aboard if at all possible (a controlled ship is always safer than open survival craft, especially in cold water or heavy weather).
• Evacuate to survival craft if the ship must be abandoned, with sufficient capacity that no person is left without a place.
• Survive in the survival craft until rescue, with adequate provisioning, signalling, exposure protection and on-board training.

The implementation is set out in three parts: Part A general provisions, Part B detailed equipment requirements with separate subdivisions for cargo and passenger ships, and Part C alternative design and arrangements.

The Chapter III architecture rests on a layered failure-tolerance principle:

• First layer: the fire and damage protection of Chapter II-2 and Chapter II-1 keeps the ship operational.
• Second layer: the bridge and engineering watch under Chapter V and the ISM Code detect and manage incipient casualties.
• Third layer: structural compartmentation and damage stability under Chapter II-1 Part B keep the ship afloat after damage.
• Fourth layer (Chapter III): when all of the above has failed and abandonment is necessary, Chapter III provides the means.

Relationship to the LSA Code and to the rest of SOLAS

Chapter III provides the regulatory shell. The detailed engineering specifications for every appliance (lifebuoy weight, lifejacket buoyancy, lifeboat capacity, immersion suit thermal performance, EPIRB battery life, etc.) are set out in the LSA Code (International Life-Saving Appliance Code, Resolution MSC.48(66) adopted 1996), made mandatory through SOLAS reference. The LSA Code is itself amended frequently, with new appliance categories (such as the rapid-deployment marine evacuation system) introduced as the technology matures.

The LSA Code is structured into seven Chapters:

• LSA Chapter I: General.
• LSA Chapter II: Personal life-saving appliances (lifebuoys, lifejackets, immersion suits, anti-exposure suits, thermal protective aids).
• LSA Chapter III: Visual signals (parachute flares, hand flares, buoyant smoke signals).
• LSA Chapter IV: Survival craft (general requirements, liferaft requirements, lifeboat requirements, partially enclosed lifeboat, totally enclosed lifeboat, free-fall lifeboat).
• LSA Chapter V: Rescue boats (general requirements, fast rescue boat).
• LSA Chapter VI: Launching and embarkation appliances (general requirements, launching arrangements with hooks, launching by free-fall, marine evacuation system).
• LSA Chapter VII: Other life-saving appliances (line-throwing appliance, general emergency alarm, public address system).

Chapter III also interacts with Chapter IV (Radio Communications, the GMDSS) on the question of distress signalling, with Chapter II-1 Part D on the question of emergency power for navigation lighting and emergency lighting along escape routes, and with Chapter II-2 on the question of fire-protected escape routes leading to embarkation stations.

Major amendment history

Chapter III has been rewritten substantially several times since 1974, each rewrite driven by incident experience:

• 1914 SOLAS (post-Titanic) introduced the “lifeboats for all” principle, replacing the prior gross-tonnage-indexed lifeboat scale that had given Titanic an apparently SOLAS-compliant lifeboat capacity for fewer than half her passengers.
• 1929 and 1948 SOLAS progressively tightened the requirements for embarkation arrangements and for crew training, but retained the open lifeboat as the standard survival craft.
• 1960 SOLAS introduced the requirement for two-way radio in survival craft and for portable radio equipment for SAR coordination.
• 1986 amendments completely redesigned the survival craft fleet, introducing totally enclosed lifeboats for tanker and cargo ship evacuations into burning oil slicks, free-fall lifeboats as an alternative for cargo ships, and standardising launch arrangements. The 1986 amendments were a response to multiple tanker fires of the 1970s and 1980s in which crew in open lifeboats had been killed by burning oil slicks at the abandonment site.
• 1996 amendments introduced the LSA Code as the detailed engineering reference and revised passenger ship requirements following the loss of MS Estonia in 1994. The Stockholm Agreement provisions on ro-ro passenger ship evacuation were also rolled into the chapter.
• 2006 amendments addressed the on-load release problem that had killed multiple crew during routine drills, prescribing redesigned hooks, fall-preventer devices, and revised drill procedures.
• 2014 amendments required all existing on-load release mechanisms to be replaced or modified to comply with the revised LSA Code requirements; the deadline for full fleet compliance was 2019. The 2014 cycle also tightened lifeboat hook design specifications and required documented testing under load.
• 2018 amendments following the loss of the Sewol (2014) tightened passenger ship evacuation training and master and crew familiarisation. The Costa Concordia (2012) lessons were also progressively incorporated.

The pattern reflects a continuous tension between the prescriptive engineering of the LSA Code and the operational realities revealed by casualties. Most amendment cycles are reactive (post-incident) rather than proactive.

Part A: General

Definitions and evaluation

Part A defines the regulatory vocabulary used throughout the chapter, with particular emphasis on the LSA categories:

• Lifeboat: a survival craft equipped to carry persons in the event of abandonment. The category includes partially enclosed and totally enclosed lifeboats, with specific sub-categories for free-fall lifeboats and for tanker-service lifeboats designed to operate within a fire-blanketed area.
• Free-fall lifeboat: a lifeboat designed to be launched by free-fall from a stowage position on the stern, with the boat dropping into the water under its own weight and the impact deceleration absorbed by the boat structure and the seated occupants restrained by harness. Free-fall lifeboats are certified for specific drop heights, typically up to 25 metres for cargo ships and up to 38 metres for some specialised vessels.
• Partially enclosed lifeboat: a lifeboat with permanent rigid covering above the gunwale that allows entry by a hatch but allows the occupants to remain partially exposed. Used on some passenger ships where the open-air access is necessary for embarkation logistics.
• Totally enclosed lifeboat (TEMPSC): a fully enclosed lifeboat protected from fire and weather by a complete rigid canopy. The standard cargo ship and tanker survival craft. Tanker-service TEMPSCs are additionally certified for fire protection and self-righting.
• Rescue boat: a smaller boat designed to recover persons from the water and to assist other survival craft. Carried in addition to the main survival craft fleet.
• Fast rescue boat (FRB): a rescue boat capable of operation at speeds above 20 knots, with launch and recovery capable of being completed at significant ship speed.
• Throw-overboard liferaft: an inflatable liferaft launched by manually throwing the canister overboard, with the painter line connected to the ship triggering inflation.
• Davit-launched liferaft: a liferaft launched from a davit similar to a lifeboat davit, with the raft loaded with persons before lowering. Davit-launched rafts are used where the ship’s freeboard exceeds the maximum height for throw-overboard launching.
• Marine evacuation system (MES): a chute-or-slide arrangement that allows passengers to evacuate from the embarkation deck directly into a deployed liferaft fleet at the waterline, bypassing the lifeboat-launching cycle. Used on passenger ships where lifeboat embarkation alone cannot evacuate the design population in the required time.
• Lifebuoy: a buoyant ring of approved buoyancy and strength, fitted with reflective material, attached to a 30-metre buoyant lifeline, and on certain stations fitted with a self-igniting light and a self-activating smoke signal.
• Lifejacket: a personal flotation device of approved buoyancy (minimum 75 newtons in still water for inflatable types, 150 newtons for solid foam types), with retro-reflective material, whistle, and a personally-attached light. Adult and child sizes are required.
• Immersion suit: a personal protective suit providing thermal protection in cold water (rated to maintain body core temperature for at least 6 hours in 0 to 2 degree Celsius water).
• Thermal Protective Aid (TPA): a lighter-weight thermal-protection garment used inside survival craft to reduce hypothermia during prolonged exposure.

Part A also covers the procedure for evaluating and approving novel LSA. The IMO Maritime Safety Committee’s Sub-Committee on Ship Systems and Equipment (SSE) develops type-approval guidance for new appliance concepts (the framework that allowed for example the introduction of lithium-battery-powered lifejacket lights and the various marine evacuation system architectures).

The Reg III/1 application calculator returns the applicable sub-set of Chapter III for a given ship type, length, gross tonnage and route.

Evacuation analysis (Regulation 5)

For passenger ships of length 120 metres or more constructed after 1 July 1999, an evacuation analysis must be performed at design to demonstrate that the ship can be evacuated within the required time:

• Maximum Total Evacuation Time of 60 minutes for ro-ro passenger ships.
• Maximum Total Evacuation Time of 80 minutes for non-ro-ro passenger ships of more than three main vertical zones.
• Higher times for very large passenger ships subject to specific approval.

The analysis uses agent-based simulation (typically maritimeEXODUS, AENEAS, EVI or equivalent), with each passenger represented as an agent moving through the ship’s geometry under behavioural rules. The simulation accounts for:

• Passenger demographics: age distribution, gender, mobility, familiarity with the ship.
• Corridor and stair geometry: width, slope, length, junction angles.
• Signage and lighting: visibility under smoke conditions, photoluminescent markers, low-location lighting.
• Casualty scenario: the assumed location of the fire or flooding, the smoke spread pattern, the closure of certain routes.
• Crew assistance: the placement of crew at decision points to direct passengers, the time crew take to organise mustered passengers.
• Embarkation rate: the time per person to reach assigned survival craft and embark.

The evacuation analysis is part of the design package submitted for class approval and supports the Safe Return to Port requirements of Chapter II-2 Regulations 21-23. The analysis is rerun whenever the ship undergoes significant modification.

Crew evacuation analysis

For passenger ships, the crew has its own evacuation analysis:

• Crew must reach assigned muster stations within 5 minutes of muster signal.
• Crew assigned to assist passengers must reach their stations before passenger movements begin.
• Crew assigned to launching duties must complete pre-launch checks within a defined time.
• Communication paths between crew muster locations must be free of interference even with main systems disabled.

Part B: Requirements for ships and personal LSA

Communications equipment (Regulation 6)

Every ship on international voyages carries a portable, water-resistant, self-contained communications package suitable for the survival environment:

• EPIRBs (Emergency Position-Indicating Radio Beacons) transmitting on 406 MHz to the Cospas-Sarsat satellite system. EPIRB carriage is one beacon for cargo ships and two for passenger ships (with one float-free hydrostatic-release-mounted and one manually deployed). EPIRBs include a 121.5 MHz homing beacon for the final approach by rescuing aircraft. The Cospas-Sarsat system is a multi-state coordinated satellite SAR network, with ground stations in the US, Canada, France, Russia, India, China, Japan, Brazil, Argentina, Vietnam, Pakistan, Saudi Arabia, South Africa, Australia, Norway, Spain, Italy, Singapore and Indonesia. The 406 MHz EPIRB transmits a unique digital identification (UIN) registered to the ship in the relevant national database, plus encoded position from the integrated GPS receiver. Detection time from activation to ground station notification is typically 1 to 5 minutes.
• SARTs (Search and Rescue Transponders) activated by an X-band radar interrogation, generating a return signature on the radar screen of approaching ships and aircraft. The signature appears as a series of 12 dots on the search-and-rescue ship’s radar at a distance corresponding to the SART location, allowing visual identification on the rescuer’s screen at distances of 5 to 8 nautical miles. AIS-SART is an alternative or supplementary device transmitting on AIS frequencies (typically VHF channels 70 and AIS messages 1 and 14), giving notification to AIS receivers in the area. At least two SARTs (or an AIS-SART pair) on every passenger ship and every cargo ship of 500 GT and above.
• Two-way radiotelephones for survival craft, on VHF channel 16 (distress) and other GMDSS channels. At least three on passenger ships and on cargo ships of 500 GT and above. The radios are fully waterproof, capable of operation by a person wearing thick gloves, and have a battery life of at least 8 hours of continuous transmission.

The Reg III/6 communications calculator returns the count and type of distress signalling equipment for a given ship.

Personal LSA (Regulation 7)

Personal LSA covers the equipment carried by individuals during embarkation and survival:

• Lifejackets of approved type for each person on board, with reflective tape, retro-reflective material, whistle, and a personally-attached light (lamp powered for at least 8 hours of 0.75 candela light output). Adult and child sizes are provided per the passenger demographic and crew composition.
  • Solid foam lifejackets provide guaranteed buoyancy without requiring activation; preferred for passenger ships where rapid donning is essential.
  • Inflatable lifejackets activate manually or by water immersion; lighter weight and more comfortable but requires user training.
  • Lifejacket lights are rated for “auto-activation upon water immersion” or “manual activation by twist” depending on the model.
• Immersion suits for cargo ships and for passenger ships in cold-water service, providing thermal protection equivalent to maintaining body core temperature for at least 6 hours in 0 to 2 degree Celsius water. Immersion suits provide insulation, head protection and a lifejacket-equivalent buoyancy element; they are stowed at each manned station. Tests for approval include the freezing-water flotation and exposure test, the donning time test (target: under 2 minutes from start), and the mobility-after-donning test verifying that the wearer can climb a 1.5 metre ladder, jump from a 4.5 metre height into the water, and swim 25 metres.
• Thermal Protective Aids (TPAs) in survival craft as supplementary thermal protection during prolonged exposure. TPAs are simpler garments (essentially an aluminised “space blanket” sleeping bag) that provide useful warmth at low cost and weight; carried in survival craft equipment lockers.
• Lifebuoys at strategic locations on weather decks, with lifebuoy lights, self-igniting lights and self-activating smoke signals for daytime visibility. The minimum number is set by ship length: typically 8 to 14 for cargo ships, more for passenger ships, with at least one on each side of the bridge wing fitted with a lifeline of buoyant rope of length at least twice the height of the lifebuoy stowage above the lightest seagoing waterline. Lifebuoys are stowed so they can be cast overboard rapidly: cast-off-and-throw stowage rather than lashed-down stowage.

The Reg III/7 personal LSA calculator and the lifebuoy distribution calculator return the equipment count and stowage requirements.

Muster list and emergency instructions (Regulation 8)

Every ship has a posted muster list showing for each crew member their assignment in the abandon-ship organisation: the survival craft to which they are assigned, their muster station, their duties (firefighter, first-aider, communicator, survival craft commander, etc.), and the alarm signal that triggers the muster. The muster list is posted in conspicuous locations on board (corridors, dining rooms, crew accommodation) and is updated whenever crew composition changes.

Specific muster list contents:

• The general emergency alarm signal (typically seven short blasts followed by one long blast of the ship’s whistle and bells, sustained for at least 10 seconds).
• The fire alarm signal.
• The abandon-ship signal.
• For each crew member: name, rating, muster station, survival craft assignment, primary duty, secondary duty, location of personal LSA.
• Standing instructions for each duty: pre-launch checks for survival craft commanders, fire-fighting party assignments, first-aid team responsibilities, crew assigned to assist passengers (passenger ships).
• Multilingual instructions where the crew composition includes multiple languages.

For passenger ships, passenger emergency instructions are also provided in cabins (and posted in conspicuous public locations) showing:

• The cabin’s assigned muster station.
• The route from the cabin to the muster station via the primary and alternative escape routes.
• Multilingual safety briefing including donning of the lifejacket.
• Pictograms of muster station, lifejacket, fire extinguisher, alarm.

The Reg III/8 muster list calculator returns the format and content requirements.

Operating instructions in survival craft (Regulation 9)

Each survival craft must carry, in waterproof form, operating instructions in a format that can be understood by the persons likely to use it. Pictograms and language combinations are required for passenger ships in international service. Specific instructions include:

• Boat handling: how to launch, stabilise, navigate.
• Engine starting and operation (for motorised craft).
• Emergency procedures: managing seasickness, treating hypothermia, dealing with injured crew.
• Distress signalling: use of EPIRB, SART, hand flares, parachute flares, smoke signals, signal mirror.
• Provisioning: rationing of water and food.

Manning and supervision (Regulation 10)

Each survival craft assigned to a station must have an officer or certificated person designated as survival craft commander, plus designated assistants. Manning per craft is sized to ensure a competent commander even with crew casualties.

Specific manning requirements:

• Each lifeboat or major survival craft has a designated person in charge with appropriate certificate of proficiency (Certificate of Proficiency in Survival Craft and Rescue Boats, CoP-SCRB, under STCW).
• Each rescue boat has a designated person in charge with the more demanding Certificate of Proficiency in Fast Rescue Boats (CoP-FRB) where applicable.
• Persons engaged in launching and recovery have certificates appropriate to the launching arrangements (davit, free-fall, MES).
• Crew assigned to passenger assistance have specific training under STCW and ship-specific procedures.

The Reg III/10 manning calculator returns the required certified manning per craft.

Muster and embarkation arrangements (Regulation 11)

The embarkation of survival craft must be possible from the embarkation deck within a specified time after muster:

• For passenger ships, all survival craft and rescue boats capable of being launched within 30 minutes of muster.
• For cargo ships, within 10 minutes for the first survival craft.

The embarkation deck height (vertical distance from waterline in lightest seagoing condition to embarkation deck) is limited:

• 4.5 metres for ships built after 1 July 1986. (Earlier ships have a higher allowed height per the historic provisions.)
• The 4.5 metre rule is the calibration that enables davit-launched lifeboats to land safely without excessive impact and gives a manageable embarkation effort for passengers.

For ships with high freeboard (typical of large container ships, large bulk carriers), the embarkation arrangements are:

• Free-fall lifeboat at the stern, with the embarkation deck at the lifeboat seating level (typically up to 25 metres above water).
• Davit-launched lifeboats with extended-reach davits.
• Marine evacuation system from the embarkation deck (passenger ships).

The Reg III/11 muster and embarkation calculator checks the embarkation arrangements.

Launching stations, stowage and recovery (Regulations 12 to 18)

This cluster of regulations governs how survival craft are stowed, launched and recovered:

• Launching stations: at least one on each side of the ship, located so that the survival craft can be launched in any list and trim within the regulatory limits. Stations must be free of obstructions, well-lit, and accessible from accommodation by routes meeting the means-of-escape requirements of Chapter II-2.
• Stowage: survival craft must be stowed in a way that supports rapid embarkation and launching, accessible from the embarkation deck, and protected from heat and exhaust gases. Stowage angle limits restrict tilt to ensure that the launch geometry is preserved during the worst-case ship heel and trim.
• Rescue boat stowage: at least one rescue boat per ship (two on passenger ships of more than 500 persons), stowed for prompt launching with launching arrangements separate from those of the main survival craft.
• MES stowage for passenger ships: marine evacuation systems are usually inflatable chute-or-slide arrangements that deploy from the embarkation deck to a slide-and-platform or directly to a deployed liferaft fleet, capable of evacuating large passenger numbers in a defined time. MES inflation must complete within 90 seconds for the basic system; the slide-and-platform configuration adds a few seconds.
• Launching and recovery: davit arrangements must be capable of launching the loaded craft in any list up to 20 degrees and any trim up to 10 degrees, and recovery must be capable of handling the empty craft from a side-by-side position. The list and trim limits derive from the casualty experience of partial-flooding scenarios where the ship’s heel is significant by the time abandonment is ordered.

The Reg III/13 stowage of survival craft calculator, the Reg III/14 rescue boat stowage calculator, the Reg III/15 MES stowage calculator, the Reg III/16 launching and recovery calculator and the MES deployment time calculator cover the various sub-requirements.

Lifeboat release mechanisms and the on-load release problem

For decades, lifeboat fall-release mechanisms were a recurring source of fatal accidents. The “on-load release” mechanism is designed to allow simultaneous release of both falls (forward and aft) when the lifeboat is afloat at the waterline, so that the boat is not left dangling from one fall after the other has released. However, in some designs, the on-load mechanism could release accidentally with the boat suspended at full height during a drill, dropping the loaded lifeboat to the water with potentially fatal force on the occupants.

The pattern of failures included:

• Wear in the cam and lever geometry of the hook, allowing the lever to slip past the locking position under the boat’s weight.
• Corrosion of the locking pin, allowing it to retract under the load force.
• Design ambiguity in the indicator that showed whether the hook was locked, leading to unintentional release.
• Improper crew procedure: cycling the release lever during equipment checks rather than only during the actual release.

Multiple fatal incidents occurred during the 1990s and 2000s. A 2010 IMO study counted at least 50 lifeboat-drill-related fatalities and several hundred serious injuries over a 10-year period.

The 2006 amendments to Chapter III and to the LSA Code, supplemented by the 2011 LSA Code amendments and the 2014 SOLAS amendment, addressed this through:

• Redesigned hook geometry with positive locking that prevents inadvertent release under load.
• Hydrostatic interlock that physically prevents on-load release until the boat is afloat (typically at less than 0.5 m above the waterline). The interlock is normally a piston or float-actuated valve that connects the release linkage only when water pressure indicates the boat is in contact with the water.
• Fall-preventer devices (FPDs) that mechanically secure the boat to the falls during drills, so an inadvertent release cannot drop the boat. FPDs are removed only after the boat is in the water for the actual launch.
• Load-test cycle with required class-witnessed load tests at intervals.

Each of the remediation steps (hook redesign, hydrostatic interlock, FPD use, load test) addressed a different failure mode. Compliance was phased over the period 2014 to 2019 to allow the world fleet to be modified.

The lifeboat release mechanism calculator and the lifeboat load-test calculator cover compliance.

Operational readiness, maintenance and inspections (Regulation 20)

LSA must be maintained in working order at all times. The required maintenance schedule is:

• Lifeboats: weekly run of engine, monthly inspection of equipment, annual servicing of release mechanism and inflation of inflatable bottoms (if any), 5-year load test.
• Liferafts: annual servicing at an approved service station including inflation, inspection of canopy and equipment, replacement of expired flares and provisions, hydrostatic release service. The service stations are approved by the liferaft manufacturer in cooperation with the flag state. The liferaft service interval calculator returns the schedule for a given raft.
• Lifejackets and immersion suits: annual inspection, periodic battery and light replacement.
• EPIRBs: annual self-test, battery replacement at the maker’s interval (typically 5 years), shore-side test of position and ID encoding through Cospas-Sarsat. Some flag states require the test to be performed at an approved service station with documentation maintained on board.
• SARTs: annual operational test (transponder activated, return verified on a test radar).
• Marine evacuation systems: annual inflation test (with the system fully deployed), 5-year detailed inspection.
• Lifebuoys: monthly visual inspection, annual buoyancy verification.
• Pyrotechnics (parachute flares, hand flares, smoke signals): replaced before expiry (typically 3 years from manufacture).

The Reg III/20 operational readiness calculator returns the schedule of inspections and tests.

Training and drills (Regulation 19)

Every crew member must:

• Be trained in their muster list duties before sailing for the first time.
• Participate in periodic drills with prescribed frequency:
  • Cargo ships: at least one abandon-ship drill and one fire drill every month, both within 24 hours of the ship leaving a port if more than 25 percent of the crew has been replaced.
  • Passenger ships: at least one abandon-ship drill and one fire drill every week.
• Receive ongoing training including operation of survival craft launching arrangements, recovery, on-board engine starting, navigation in the survival craft, distress signalling and radio operation.

For passenger ships, passenger drills and instructions are required:

• Passenger muster within 24 hours of embarkation for voyages of more than 24 hours, with demonstration of lifejacket donning and explanation of the muster signal and station. The post-Costa Concordia amendments tightened this rule, requiring the muster to be completed before sailing where practicable rather than within 24 hours.
• Multilingual safety announcements.
• Visual demonstration of lifejacket donning and emergency lighting.
• Designation of “directors” and “passenger marshalling” roles among the crew.

For ro-ro passenger ships, additional drill scenarios include vehicle deck fire and water-on-vehicle-deck stability scenarios.

The Reg III/19 training and drills calculator returns the required drill content and frequency.

Cargo ship requirements (Regulation 21)

Cargo ships of 500 GT and above on international voyages require:

• Survival craft on each side with combined capacity at each side equal to 100 percent of total persons on board (cargo ships sail with the option to evacuate to either side, in case one side is inaccessible due to list or fire).
• Free-fall lifeboat at the stern as an alternative arrangement on some ship types (capacity for all persons), with the free-fall lifeboat certified for a drop height appropriate to the ship’s stern freeboard.
• Rescue boat capable of recovering persons from the water and assisting other survival craft (at least one).

For tankers, additional requirements include:

• Tanker-service totally enclosed lifeboats with fire-protected canopy and self-righting capability.
• Water-spray system on the lifeboat exterior (to cool the canopy during launch through a fire-blanketed area).
• Air-supply system in the lifeboat sized for the time required to clear the burning area.
• Fire-protective embarkation deck arrangements.

The Reg III/21 cargo ship survival craft calculator returns the required capacity for a given crew complement.

Passenger ship requirements (Regulation 31)

Passenger ships have higher LSA capacity requirements:

• Lifeboats and liferafts on each side with capacity sufficient to accommodate at least the persons that side is intended to serve, plus an aggregate capacity (lifeboats plus liferafts both sides combined) of at least 125 percent of total persons on board.
• Rescue boats: at least one (two if persons on board exceed 500).
• Marine evacuation systems: at least one for ships not provided with sufficient lifeboat capacity at the embarkation deck. MES is increasingly the primary evacuation mode on large modern cruise ships, with lifeboats serving as a backup.
• Public LSA stations with lifejackets at strategic public locations in addition to cabin-located jackets.
• Children’s lifejackets in numbers proportional to the cabin demographic, with size graduations.

The Reg III/31 passenger ship survival craft calculator and the liferaft distribution calculator implement these requirements.

Part C: Alternative design and arrangements

Chapter III Part C mirrors the Chapter II-1 and Chapter II-2 Part F provisions, allowing alternative LSA arrangements where engineering analysis demonstrates equivalent safety. This pathway has been used for novel cruise-ship architectures (very high embarkation deck heights, large public spaces requiring reverse-flow evacuation), for offshore service vessels with mission-specific evacuation requirements, and for unconventional yachts.

Examples of approved alternatives:

• High-freeboard cruise ships with marine evacuation systems as the primary evacuation mode, lifeboats reduced from 100 percent each side to 50 percent each side because the MES exceeds the lifeboat capacity in evacuation rate.
• Polar service vessels with insulated lifeboats and additional thermal protection, justifying alternative provisioning standards.
• Offshore wind turbine service vessels with helicopter rescue as a primary evacuation mode for limited persons on board.
• Catamaran fast ferries with stowage and launching arrangements derived from the HSC Code rather than SOLAS prescriptive rules.

Each Part C approval requires:

• Engineering analysis demonstrating equivalent safety.
• Flag state approval and IMO registration.
• Operational restrictions documented on the ship’s certificate.
• Periodic review at survey intervals.

Notable casualties

RMS Titanic, 1912

The loss of RMS Titanic on 15 April 1912 with approximately 1,500 dead drove the foundational SOLAS principle of lifeboats for all persons. Titanic carried lifeboats for 1,178 of the more than 2,200 persons on board, complying with the Board of Trade rules of the time which had been calibrated to gross tonnage rather than persons on board.

The casualty also exposed:

• Inadequate lifeboat drills with crew untrained in launching.
• No system of muster station assignment.
• Inadequate radio equipment (operator hours, distress signal procedure).
• Lack of life-saving signals among ships in the vicinity.

The 1914 SOLAS Convention addressed each of these but never entered into force; the substantively similar 1929 Convention became the first effective international regulation of LSA.

MS Andrea Doria, 1956

The Italian liner MS Andrea Doria sank on 26 July 1956 after collision with the Stockholm. Initial list of more than 20 degrees made the high-side lifeboats unlaunchable; only the low-side lifeboats could be used. The casualty drove the requirement, retained in modern SOLAS, that survival craft must be launchable in lists up to 20 degrees and trims up to 10 degrees.

The casualty also drove:

• Mandatory radar carriage and watch-keeping on bridge.
• Standard lifeboat capacity for 100 percent each side (introduced progressively through the 1960s amendments).
• Improved life-saving signals and rescue coordination procedures.

MS Estonia, 1994

The ro-ro passenger ferry MS Estonia sank in the Baltic Sea on 28 September 1994 with 852 dead. Severe rapid heel after vehicle deck flooding made the high-side LSA unreachable; the ship sank in about 30 minutes, faster than the prescribed 30-minute embarkation time. Most persons who reached the water died of hypothermia despite lifejackets.

The casualty drove substantial 1996 amendments tightening:

• Embarkation arrangements to permit launching in higher list angles.
• Immersion suit availability at all manned stations (rather than only on the bridge).
• Marine evacuation systems for rapid mass evacuation.
• Crew training in mass evacuation scenarios with tight time budgets.
• Emergency lighting and signage to support evacuation in heeled and rolled conditions.

The casualty also drove the Stockholm Agreement and progressive integration of its provisions into Chapter II-1 damage stability for ro-ro passenger ships.

Costa Concordia, 2012

The Italian-flagged passenger ship Costa Concordia struck a rock and partially sank near Isola del Giglio on 13 January 2012 with 32 dead. Severe list of more than 60 degrees made the high-side lifeboats unlaunchable, leaving evacuation to the low-side boats and to swimmers reaching shore.

The casualty drove amendments to:

• Passenger evacuation training with explicit reference to the conduct of the muster and to the master’s coordination role.
• Master-crew familiarisation with novel ship architectures (the Costa Concordia was a relatively novel 290 metre cruise ship; the casualty exposed gaps in the master’s understanding of the evacuation flow).
• Evacuation analysis review for existing ships of similar size (retrofit obligations were debated but largely not implemented; new construction took up the lessons).
• Safe Return to Port philosophy now embedded in Chapters II-1 and II-2.

MV Sewol, 2014

The South Korean ferry MV Sewol capsized on 16 April 2014 with approximately 304 dead, the majority being secondary school students on a class trip. The casualty exposed catastrophic failures of crew leadership during evacuation; passengers were instructed to remain in cabins as the ship listed and sank. The crew abandoned ship without successfully directing the passengers.

The casualty drove:

• Tightening of crew evacuation training requirements internationally.
• Circulation of evacuation-leadership standards through the STCW Convention Section A-V/2.
• Enhanced port state control attention to passenger ship safety culture.

Lifeboat drill fatalities and the on-load release problem

Multiple fatal accidents during routine lifeboat drills over the 1990s and 2000s involved on-load release mechanisms releasing inadvertently with the lifeboat suspended high above the water. Investigation typically traced the cause to wear, corrosion, or design ambiguity in the release mechanism geometry. The 2006 SOLAS amendments and the post-2014 fleet-wide replacement programme were a direct response.

The fleet-wide replacement programme involved approximately 30,000 SOLAS-flagged ships and was completed by the 2019 deadline. The programme cost billions of dollars across the world fleet but the lifeboat drill fatality rate fell sharply after compliance.

Container ship and tanker abandonments

Multiple container ship and tanker incidents have demonstrated the LSA architecture in action. The tanker MT Sanchi (2018, lost in collision and fire in the East China Sea, 32 dead) showed the limitations of standard lifeboat fire protection in heavy fire scenarios. The container ship MV Maersk Honam (2018, fire in Arabian Sea) used the fire-protected stern free-fall lifeboat to evacuate the surviving crew while the bow burned.

Cospas-Sarsat satellite SAR system

The Cospas-Sarsat satellite-aided search and rescue system is the global infrastructure that detects and locates EPIRB activations. Originally a joint US-USSR-Canada-France programme established in 1979, the system today involves over 40 participating states and provides global coverage through:

• GEO satellites (geostationary orbit at approximately 36,000 km altitude): provide near-instantaneous detection of beacon activation but do not initially compute beacon location (the doppler shift required for location does not exist for stationary satellites). GEO coverage is global but has gaps at high latitudes.
• LEOSAR satellites (low-earth orbit at 850 km altitude): provide doppler-derived location but with longer detection time (typically up to 90 minutes for a beacon activated outside an immediate satellite footprint, until a satellite passes overhead). LEOSAR has full polar coverage.
• MEOSAR satellites (medium-earth orbit at 19,000 to 24,000 km altitude, a relatively new addition based on GPS, Galileo and GLONASS satellite payloads): provide near-real-time detection and location through multilateration of the beacon signal. MEOSAR is rolling out as a primary operating mode through the 2020s.

Each beacon activation produces:

• A unique digital identification (UIN) registered to the ship in the national EPIRB database.
• An encoded position from the integrated GPS receiver (if fitted; modern beacons all are).
• A 121.5 MHz homing signal for short-range direction finding by approaching SAR aircraft.

The alert is distributed from the satellite ground station to the responsible Mission Control Centre (MCC), which forwards to the relevant Rescue Coordination Centre (RCC) for response coordination. End-to-end alert distribution time is typically 1 to 5 minutes for a properly registered modern beacon.

Common operational issues include unregistered beacons (delaying response while the registry is checked), false activations (during testing or storage), and beacons registered to one ship but installed on another (after sale or transfer of vessels).

Helicopter rescue and SAR coordination

Helicopter winch rescue is the principal rescue method for offshore distress. Coordination involves:

• RCC tasking: the RCC dispatches the rescue helicopter, identifies the appropriate SAR aircraft and informs vessels in the area.
• On-scene coordination: the rescue helicopter or fixed-wing aircraft acts as on-scene SAR Mission Coordinator (SMC), directing other resources.
• Ship-side preparation: the distressed ship (or the recovered survivors in lifeboats or rafts) prepares for helicopter pickup with cleared deck areas, marker flares, life-jacket donning, and radio communication on a designated frequency (typically VHF Channel 6 or 16).
• Hi-line transfer: a heaving line is lowered from the helicopter to the ship’s deck (or to the survival craft) before the rescue strop is sent down. The line provides continuous tension during the transfer to prevent the rescue strop swinging.
• Recovery aboard helicopter: each survivor is winched up individually in a rescue strop or stretcher, transferred to the helicopter cabin, and then to a shore-side reception point.

Helicopter rescue range is limited by helicopter fuel and by weather. Long-range SAR helicopters (Sikorsky S-92, Eurocopter EC225, AgustaWestland AW101) have rescue range of typically 200 to 400 nautical miles outbound and similar return, with capacity for 12 to 20 survivors per trip. Beyond helicopter range, surface vessels are the primary rescue resource.

Lifeboat type specifications

The LSA Code and SOLAS Chapter III require lifeboats to meet detailed specifications. For totally enclosed lifeboats (TEMPSCs):

• Capacity: typically 30 to 80 persons, sized to match the ship’s evacuation requirement.
• Buoyancy reserve: at least 100 percent of the displacement of all persons (i.e. the boat would float even with double the design occupancy).
• Engine: certified marine diesel with minimum runtime at full power of 24 hours, and starting capability after 24 hours of cold immersion.
• Self-righting: certified to right itself within 5 seconds from any position of complete inversion.
• Fire protection: TEMPSC for tanker service has water-spray on the canopy and air-supply system for the crew, certified for fire-blanketed area transit.
• Equipment: anchor and rope, paddles, boat hook, food and water rations (minimum 3 litres of water per person), first aid kit, fishing kit, signal flares, signal mirror, knife, repair kit, two-way radio, EPIRB, SART, sea anchor, rescue quoit and life lines.

For free-fall lifeboats:

• Drop height certification: typically up to 25 metres (cargo ship stern stowage) or 38 metres (very large ship variants).
• Impact deceleration: passengers seated in shock-absorbing harness; certified peak deceleration limits ensure survival even at maximum drop height.
• Self-righting: post-drop, the boat self-rights within seconds.
• Engine start: capable of starting within 30 seconds after impact and producing full ahead movement.

STCW training and certification

Crew operating LSA require certification under STCW:

• STCW Section A-VI/2 paragraph 1: Certificate of Proficiency in Survival Craft and Rescue Boats other than Fast Rescue Boats (CoP-SCRB), basic certificate for crew operating standard lifeboats and rescue boats. Approximate course duration: 5 days.
• STCW Section A-VI/2 paragraph 2: Certificate of Proficiency in Fast Rescue Boats (CoP-FRB), additional certificate for crew operating fast rescue boats with closed-canopy and high-speed handling. Approximate course duration: 5 days.
• STCW Section A-V/1: Familiarisation training for officers and ratings on tankers and gas carriers, covering relevant LSA operations.
• STCW Section A-VI/3: Advanced firefighting (relevant for crew designated as fire-fighting parties whose duties include LSA assembly and embarkation control).
• STCW Section A-VI/4 paragraph 1: Medical first aid (basic), required for crew designated as muster station first-aid responders.
• STCW Section A-VI/4 paragraph 2: Medical care (advanced), required for officers designated as medical-care-in-charge.

The certificates are issued by IMO White-listed flag states or by states with approved equivalent training. Each certificate has a 5-year validity, with refresher training required for renewal.

Documentation

Every ship covered by Chapter III carries on board:

• The Cargo Ship Safety Equipment Certificate (cargo ships) or Passenger Ship Safety Certificate (passenger ships), evidence of compliance with Chapter III alongside Chapter II-1 and Chapter II-2.
• The current muster list, posted in conspicuous locations.
• The fire control plan with relevant escape routes (under Chapter II-2 but referenced here).
• Survival craft certificates including the lifeboat capacity certificate, the load-test certificate, the davit examination certificate.
• LSA service and inspection records under Regulation 20.
• Crew training records including STCW certificates of proficiency and the ship’s training matrix.
• For passenger ships: the evacuation analysis (or summary), emergency instructions in cabins, and the public address system test records.
• Pyrotechnic stock list with expiry dates.

Related Calculators

• SOLAS III/1, Application LSA Calculator
• SOLAS III/6, Communications Calculator
• SOLAS III/7, Personal life-saving Calculator
• SOLAS III/8, Muster list Calculator
• SOLAS III/9, Operating instructions Calculator
• SOLAS III/10, Manning survival craft Calculator
• SOLAS III/11, Survival craft muster arrangement Calculator
• SOLAS III/12, Embarkation stations Calculator
• SOLAS III/13, Stowage survival craft Calculator
• SOLAS III/14, Stowage rescue boats Calculator
• SOLAS III/15, MES arrangements Calculator
• SOLAS III/16, Survival craft launching Calculator
• SOLAS III/19, Emergency training and drills Calculator
• SOLAS III/20, Operational readiness Calculator
• SOLAS III/21, Survival craft capacity Calculator
• SOLAS III/31, Survival craft and rescue boats Calculator
• Lifeboat Release Hook, Upgrade Calculator
• Lifebuoys, Distribution & Lights Calculator
• Liferafts, Distribution Check Calculator
• Lifeboat, Falls Load Test Calculator
• Liferaft, Servicing Interval Calculator
• MES, Deployment Time Calculator

See also

• SOLAS Convention parent article
• SOLAS Chapter II-1: Construction, Subdivision, Stability, Machinery and Electrical Installations
• SOLAS Chapter II-2: Fire Protection, Detection and Extinction
• SOLAS Chapter V: Safety of Navigation
• SOLAS Chapter VI: Carriage of Cargoes and Oil Fuels
• GMDSS Overview
• ISM Code
• STCW Convention
• Polar Code
• Stockholm Agreement

References

• IMO, International Convention for the Safety of Life at Sea (SOLAS), 1974, as amended, Chapter III.
• IMO, International Life-Saving Appliance Code (LSA Code), Resolution MSC.48(66), 1996, as amended.
• IMO, Revised Recommendation on Testing of Life-Saving Appliances, Resolution MSC.81(70).
• IMO Resolution MSC.317(89) (2011), Adoption of amendments to SOLAS Chapter III concerning lifeboat release mechanisms.
• IMO Resolution MSC.402(96) (2016), Requirements for maintenance, thorough examination, operational testing, overhaul and repair of lifeboats and rescue boats, launching appliances and release gear.
• IMO MSC.1/Circ.1392, Guidelines for evaluation and replacement of lifeboat release and retrieval systems.
• IMO MSC.1/Circ.1206/Rev.1, Measures to prevent accidents with lifeboats.
• Cospas-Sarsat System Documentation, current edition, available from cospas-sarsat.int.