SOLAS Lifeboat Regulations: What Officers Must Know

SOLAS Chapter III governs every survival craft on a merchant vessel — from the weekly visual check to the five-yearly thorough examination. This article covers what the regulations actually require and where the gap between paperwork and real readiness tends to open up.

What is the difference between enclosed and open lifeboats under SOLAS?

SOLAS Chapter III requires totally enclosed lifeboats on cargo ships built after July 1986. Open lifeboats are no longer permitted as primary survival craft on new vessels, though legacy installations remain on older tonnage under grandfather provisions.

A totally enclosed lifeboat (TELB) has a rigid, weathertight canopy covering all occupants. On cargo ships, SOLAS Chapter III Regulation 31.1.1 requires the lifeboat to be self-righting — meaning it returns to the upright position automatically after capsizing. This requirement applies to cargo ships; passenger ship lifeboats operate under different provisions.

Open lifeboats offer no protection from fire, weather, or sea spray. The defining deficiency is environmental exposure — not self-righting capability, which depends on hull form and ballast and can be present in either type. Any vessel still carrying open lifeboats as primary craft may attract PSC attention depending on compliance status and condition.

What additional requirements apply to tanker lifeboats under SOLAS Chapter III?

SOLAS Chapter III Regulation 31 requires tankers to carry fire-protected lifeboats fitted with a self-contained water spray system. The system must cover the entire exterior surface. Flow rate and coverage duration requirements are specified in the LSA Code, Chapter IV.

The water spray system is visually checked weekly; functionally tested per SMS. Blocked nozzles are a recurring finding — scale accumulates from the inside of the nozzle body. The technical requirements for the spray system are set out in the International Life-Saving Appliance (LSA) Code, which is the primary reference document alongside SOLAS Chapter III.

How Do Lifeboat Types Differ Under SOLAS?

Type	Launch Method	Key Requirement
TELB	Davit	Self-righting
Free-fall	Ramp	Immediate propulsion
Tanker boat	Davit	Fire-protected

What are the SOLAS requirements for free-fall lifeboats?

SOLAS requires certain cargo ships to carry a free-fall lifeboat or an Administration-approved equivalent arrangement under Regulation 26.2. The boat drops into the sea under gravity.

SOLAS Chapter III Regulation 26.2 requires bulk carriers and certain other cargo ships to carry a free-fall lifeboat at the stern or an Administration-approved equivalent arrangement providing the same level of safety.

The requirement for bulk carriers applies to vessels of 20,000 GT and above built after July 2006.

The free-fall release system must be operable from inside the boat and from a dedicated secondary position on the ramp structure outside the boat. Both positions must be tested during each abandon ship drill.

A simulated free-fall launch — where the boat is partially released down the ramp without entering the water — must be conducted at intervals not exceeding six months, per IMO MSC/Circ.1168. This is distinct from the quarterly water launch required under the ship drills programme for all survival craft.

The launch ramp angle, cradle condition, and on-load release mechanism all require inspection at each weekly and monthly inspection. A corroded or seized release assembly on a free-fall boat is a direct threat to crew survival — it will not show up in a static dockside check.

What engine and fuel checks apply specifically to free-fall lifeboats?

Free-fall lifeboats carry no painter line — the boat must drive clear of the ship under its own power immediately on water entry. Engine start and propulsion confirmation are therefore the first functional checks at every monthly inspection. Fuel levels, oil level, and coolant must be verified before the simulated launch exercise.

Engine running time under the monthly test must be sufficient to confirm normal operating temperature. A cold start held for thirty seconds proves nothing. Log the running time alongside the fuel state — PSC officers check both entries for consistency.

What does SOLAS Chapter III Regulation 19 require for weekly inspections?

SOLAS requires weekly inspection of all lifeboats to confirm readiness and condition. SOLAS Chapter III Regulation 19.3.1 requires the officer responsible to inspect all survival craft, rescue boats, launching appliances, and marine evacuation systems weekly and confirm they are in good order and ready for use. The inspection is logged in the Official Log Book with date and signature.

The regulation does not mandate a checklist format — that is an ISM Code requirement on the vessel’s Safety Management System. The minimum scope, however, is set by SOLAS and is not negotiable. Any deficiency found must be recorded and corrected before the vessel sails.

What does the weekly lifeboat inspection cover?

• Visual condition of hull, canopy, and davit structure
• Gripes and cradle securing arrangements — check for corrosion and correct tensioning
• Engine oil level, coolant level, and fuel quantity
• Battery electrolyte level and charge state (or sealed battery charge indicator)
• Water spray nozzles clear and unobstructed (tankers)
• Bowsing tackles and tricing pendants — condition and free movement
• On-load release gear — visual check for corrosion, paint bridging, and correct reset
• Embarkation ladder rigged and accessible

The weekly inspection tells you the boat is present and equipped. It does not tell you whether the on-load release hook will function under load — that requires the monthly lowering exercise.

What does SOLAS Chapter III Regulation 19 require for monthly inspections?

SOLAS Chapter III Regulation 19.3.2 requires each rescue boat to be launched and manoeuvred in the water at least once a month. For lifeboats, the monthly requirement is to swing the boat out and lower it to embarkation deck level with the engine running. Regulation 20 covers maintenance requirements and planned service intervals — it operates separately from the inspection schedule in Regulation 19.

The monthly lowering is not a paperwork exercise. The boat must physically move. Davit brake systems, limit switches, wire run, and sheave condition all become apparent only when the boat is under load and in motion. Static checks at the stowed position miss corroded sheaves and sticking brakes entirely.

IMO MSC/Circ.1206/Rev.1 provides guidance on the safe conduct of lifeboat drills and inspections without a full water launch, including the precautions required when operating the on-load release gear at the embarkation deck rather than at the waterline.

How often must lifeboats be launched to water under SOLAS?

SOLAS Chapter III Regulation 19.3.3 requires lifeboats to be launched with the assigned crew and manoeuvred in the water at least once every three months during an abandon ship drill. Flag state Administrations may permit an exemption where launching would be unsafe — typically a rescue boat substitution is authorised in such cases.

The three-month water launch is the primary functional test of the complete system. Falls running unevenly, bent davit arms, and release gear that binds under sea conditions all surface here and nowhere else. These launches form part of the vessel’s ship drills programme and must be recorded with weather conditions, crew present, and deficiencies noted.

Task	Regulation	Interval
Visual inspection	SOLAS III/19.3.1	Weekly
Lowering test	SOLAS III/19.3.2	Monthly
Waterborne drill	SOLAS III/19.3.3	3 months

What periodic maintenance does SOLAS require for lifeboat falls and securing gear?

SOLAS Chapter III Regulation 20 and IMO MSC/Circ.1206/Rev.1 set the periodic maintenance requirements for lifeboat falls wire, on-load release gear, and davit systems. These intervals are separate from weekly and monthly operational checks — they require physical overhaul, not visual inspection.

Falls wire must be turned end-for-end or replaced at five-year intervals. Turning is only permitted where the wire has sufficient length and no significant corrosion at either end. Where corrosion is present at the drum end or at the falls attachment point, replacement is the only compliant option.

What does the five-yearly thorough examination of on-load release gear cover?

SOLAS Chapter III Regulation 20.11 requires a thorough examination of all on-load release gear at five-year intervals, conducted by a manufacturer’s representative or approved service provider during the vessel’s class renewal survey.

The five-yearly service requires disassembly and internal inspection of the release hook mechanism, load testing of the davit and falls system, and replacement of all wear items specified in the manufacturer’s service manual. A visual check does not satisfy this requirement — the hook must be opened and examined internally.

Gripes and cradle securing arrangements are inspected weekly but have no fixed replacement interval under SOLAS — replacement is on condition. Corrosion at lashing points, deformation of gripe bars, and deterioration of rubber pads in the cradle all justify replacement regardless of age.

What is the liferaft HRU replacement interval, and why does it not apply to lifeboats?

Hydrostatic release units (HRUs) are fitted to liferafts, not lifeboats. The HRU is a pressure-activated mechanism that releases the liferaft securing straps when submerged to approximately four metres, allowing the raft to float free if the ship sinks with rafts still stowed. Lifeboats have no equivalent fitting.

HRUs must be replaced every two years — no service extension is permitted without explicit flag state approval. The replacement date must appear on the unit, in the Safety Equipment Certificate, and in the vessel’s planned maintenance system. An overdue HRU generates a PSC deficiency in virtually every port state.

This distinction matters during surveys and PSC inspections. Lifeboat gripes, cradle securing pins, and bowsing tackles are lifeboat-specific securing components. HRUs belong exclusively to the liferaft stowage arrangement. Do not conflate them on inspection checklists or in the SMS.

What is the difference between on-load and off-load release mechanisms?

On-load release allows the lifeboat to be released from the falls while the full weight of the boat and crew still acts on the hook — typically at the moment of water contact, before buoyancy transfers the load. Off-load release requires the boat to be waterborne and the falls to be slack before the hook will open.

On-load release is the operationally critical mechanism. A series of fatal accidents — where premature release at height threw crew members into the sea — drove IMO to issue MSC.1/Circ.1392, which mandates a deliberate two-step operation to prevent accidental activation. Single-action hooks that pre-date the 2010 SOLAS amendments must be replaced.

Inspect the on-load release hook at every monthly lowering. Look for corrosion at the pivot point, paint bridging the latch mechanism, and whether the safety pin is present and correctly seated. A hook with corroded internals will not release cleanly under load — and static inspection cannot detect internal corrosion.

What does IMO MSC.1/Circ.1392 require for on-load release gear?

MSC.1/Circ.1392 requires all on-load release hooks that do not meet the revised SOLAS requirements to be replaced. The hook must be clearly marked with its safe working load, the correct release sequence, and whether it is an on-load or off-load type. Markings must be permanent and legible.

Vessels built or converted since the 2010 SOLAS amendments must carry hooks that can only be reset by a deliberate, two-step manual process without tools. The reset procedure must be documented in the vessel’s SMS and demonstrated to crew during drills. Compliance is verified by class at each survey.

What are the SOLAS requirements for immersion suit stowage on cargo ships?

SOLAS Chapter III Regulation 7.3 requires immersion suits to be provided for every person on board cargo ships. They must be stowed where they can be donned in not more than two minutes — this is a functional requirement tested during abandon ship drills, not a recommendation.

Stowage location requires scrutiny beyond the regulation text. A suit stored in a crew cabin or bridge wing locker may satisfy the two-minute donning requirement under normal conditions. If the route to that locker passes through accommodation on fire, the suit is inaccessible in the scenario it is designed for.

Each immersion suit must be inspected annually by an approved service station under SOLAS Chapter III Regulation 20. The annual service is a mandatory certification requirement — it falls within the scope of the Safety Equipment Survey covered in types of surveys carried out on ships. An out-of-date service label on an immersion suit is a recordable PSC deficiency.

Marking suits with the wearer’s name or station number is standard SMS practice and is required by many flag states and vetting regimes — but it is not an explicit SOLAS mandate in Chapter III. Confirm your flag state’s specific requirements. PSC officers check that suits are serviceable, correctly stowed, and within service date — gloves and hoods must be present in the storage bag.

What is the gap between documented compliance and actual readiness that surveyors find?

The most common finding on lifeboat surveys is not missing equipment — it is equipment present but non-functional. The log book shows every weekly inspection completed. The on-load release hook has never been lubricated. Both facts coexist on the same vessel without triggering any alarm in the SMS.

Corroded davit wire is only detectable when the falls are run out fully to water level. Vessels that lower to embarkation deck and stop never expose the wire near the drum, behind the sheaves, or at the falls attachment point. Three-month water launches exist precisely to expose these failure points.

The three deficiencies most consistently cited in port state control detention reports involving survival craft are: on-load release hooks corroded or seized; immersion suits with perished seals or missing accessories; and liferaft HRUs overdue for replacement. All three are detectable on a competent weekly inspection — and all three are routinely missed.

The surveyor’s job is not to catch the crew — it is to find what the SMS has not caught. Accurate records on non-functional equipment indicate an SMS deficiency. Functional equipment with no records indicates a cultural deficiency. Both require corrective action and a root cause entry in the non-conformity log.

What are the most common lifeboat deficiencies found during PSC inspections?

• On-load release hook corroded, seized, or mechanism bridged with paint
• Falls wire corroded at drum end — only visible on full run-out to waterline
• Gripes deformed or securing arrangements corroded beyond serviceable condition
• Bowsing tackles and tricing pendants deteriorated or seized
• Engine fails to start or does not reach operating temperature during monthly test
• Immersion suit seals perished, gloves or hood missing from storage bag
• Liferaft HRUs overdue for two-year replacement (liferaft deficiency, grouped in same PSC sweep)
• Free-fall on-load release mechanism corroded on bulk carrier stern installations
• Water spray system nozzles blocked on tanker fire-protected lifeboats

These deficiencies appear consistently across MCA MAIB incident reports and Paris MoU annual reports. A vessel that cannot launch its lifeboats also cannot execute the distress signalling sequence effectively — the international distress signal requirements and survival craft readiness are treated as a linked system by PSC officers.

Frequently Asked Questions