Gravity Davit Mastery: Complete Guide to Lifeboat Lowering, Recovery, and Essential Safety Checks for Seafarers
Life-Saving Appliances • SOLAS Chapter III • Shipboard Training
Gravity Davit Mastery: Complete Guide to Lifeboat Lowering, Recovery, and Essential Safety Checks for Seafarers
A practical guide to gravity davit lifeboats, controlled lowering, powered recovery, falls and sheaves, release gear, maintenance records, safe drills, STCW survival-craft training and genuine DGMA service and MTI verification.
The lifeboat sits in its cradle, quiet and familiar. To a new seafarer, the davit may look like a collection of beams, wires, sheaves and a winch. To an experienced boat officer, each part tells a story: the boat’s weight, the fall wires, the brake, the limit switches, the embarkation deck, the release hooks and the route the craft must take to reach the water.
In an emergency, that equipment must work in an environment that is rarely perfect. The ship may be listing. The sea may be rough. Visibility may be poor. The boat may be crowded, and the crew may be working under alarm, smoke, darkness or heavy weather. A gravity davit is designed to help move a lifeboat outboard and lower it in a controlled way, but it is not a magic system that removes all risk.
Safety comes from the combination of sound design, correct stowage, maintained falls and sheaves, a tested winch brake, reliable release gear, trained crew, clear communication and a drill plan that never sacrifices people for appearance. This guide explains the system without turning a blog post into an unsafe live-launching script.
What is a gravity davit?
A gravity davit is a launching appliance that uses the weight of the lifeboat and its equipment to help move the davit arms and boat outboard as the craft is lowered. The descent is controlled by the winch and brake arrangement. Recovery is normally powered: the winch hauls the boat back toward the embarkation position and stowed location through the falls, sheaves and associated fittings.
The exact arrangement varies between manufacturers and ship designs. Some systems use rails, arms, pivoting davits, bowsing arrangements, gripes and securing devices. The control station may be at the davit, inside the boat, at the embarkation deck or in another approved position. A seafarer must learn the actual equipment carried on the ship rather than assuming every gravity davit behaves like the last one they saw.
Gravity-assisted lowering
The boat and davit geometry help move the craft outboard, but the winch brake and approved operating method control the descent.
Powered recovery
The winch normally hauls the empty or approved test load back. Recovery depends on the motor, brake, falls, sheaves, limit systems and correct alignment.
Mechanical control
Brakes, release systems, hooks, gripes, limit switches and manual or emergency arrangements must be understood from the equipment manual.
Human coordination
The coxswain, boat officer, davit operator, deck team and bridge or command team must use agreed signals and stop-work authority.
Gravity davit components every seafarer should recognise
You do not need to be a davit designer to work safely around a lifeboat, but you should know the names and hazards of the main components. Familiarity helps you report a defect before it becomes a failure.
Davit arms and foundations
The arms carry the boat through the launch and recovery path. Their foundations, pivots, welds and structural attachments transfer load into the ship. Look for obvious deformation, cracks, corrosion, missing fasteners, unusual movement or anything that differs from the approved arrangement. Never climb or work on the structure unless the ship’s procedure provides safe access and protection.
Falls, wires and terminations
The falls connect the winch system to the boat. Damaged strands, kinks, birdcaging, corrosion, broken wires, poor lubrication, incorrect reeving or damaged terminations can compromise the system. A fall is a load-bearing component, not an ordinary rope to be judged by appearance alone.
Sheaves and blocks
Sheaves guide the fall and must rotate, align and remain in good condition. A seized, damaged or misaligned sheave can create heat, abrasion and abnormal loading. Guards and access arrangements must remain fitted as designed.
Winch and brake
The winch controls lowering and recovery. The brake is critical because an uncontrolled descent can injure people, damage the boat or overload the falls. A brake test must follow the approved maintenance and testing procedure; crew should never adjust a brake casually because the control feels stiff or the boat lowers slowly.
Release gear and hooks
On-load and off-load release arrangements are safety-critical. The correct setting, interlocks, cables, hooks, hydrostatic devices and indicators must be maintained and tested according to the approved manual and service requirements. An apparently small adjustment can change how the boat releases under load.
Why gravity davit drills need special care
IMO has repeatedly addressed accidents involving lifeboats during drills and inspections. The history matters because many incidents occurred when people treated a drill as routine work. A lifeboat can move suddenly, a wire can fail, a hook can release unexpectedly or a person can fall between the boat and ship.
IMO explains that SOLAS requirements entered into force on 1 January 2020 for the maintenance, thorough examination, operational testing, overhaul and repair of lifeboats, rescue boats, launching appliances and release gear. The objective is a uniform, safe and documented standard, supported by authorised, qualified and certified service providers.
The safest drill is one that tests the crew’s readiness without creating an unnecessary exposure. A boat does not always need to be fully launched into the water to prove that every member understands muster, embarkation, communications, equipment and command. The responsible officer and company should choose the drill method allowed by the ship’s procedures, SOLAS, flag and risk assessment.
High-level lowering sequence
The following is a planning framework, not a replacement for the vessel’s operating manual. Only the designated and trained boat team should perform the equipment actions.
Establish whether the activity is an exercise, maintenance task or emergency. Check weather, sea state, ship motion, traffic, lighting, communications and the exclusion zone.
Check stowage, securing arrangements, falls, hooks, embarkation access, equipment condition and any restrictions recorded in the log or maintenance system.
Assign the coxswain, davit operator, boat officer, deck watchers, communications role and stop-work authority. Agree hand signals or radio words before movement begins.
Keep people away from snap-back zones, bights, pinch points, the fall path, the gap between boat and ship and any area beneath suspended loads.
Follow the manufacturer’s sequence for gripes, lashings, hooks, painter arrangements and other restraints. Stop if a securing device is jammed or its condition is uncertain.
Use the designated controls and monitor the boat, falls, davit arms, brake, ship side, water surface and communications. Stop immediately for abnormal noise, vibration, snagging, uncontrolled movement or loss of communication.
Before any embarkation, release or boat movement, the responsible officer confirms that the craft and personnel are in the correct condition and that the next action is authorised.
Recovery: bringing the lifeboat back safely
Recovery often receives less attention than lowering, yet it contains its own hazards. The boat may be wet, difficult to align or affected by swell. The falls must connect correctly. The crew must remain clear of hooks, wires, sheaves, embarkation decks and moving davit arms. Recovery should be directed by the responsible boat officer with clear communication to the winch operator.
Before hoisting, confirm that the boat is in the required configuration, the occupants are positioned according to the procedure, the falls and hooks are correctly connected, the boat is clear of obstructions and the winch capacity and brake condition are suitable. The operator should not continue against abnormal resistance. A boat that hangs unevenly or catches on the ship’s side must be stopped and assessed.
As the boat approaches the embarkation position, people face pinch and crush hazards between the boat, davit arms, ship’s side and landing points. Do not place hands or feet on moving contact surfaces. Use designated handles, barriers and safe access routes. Once stowed, reinstate the approved securing arrangements and record any defect or unusual event.
Critical safety checks before a drill
| Area | What the team should verify | Stop-work signs |
|---|---|---|
| Boat and structure | Hull, seats, fittings, drains, equipment, engine, fuel and steering condition according to the checklist. | Cracks, water ingress, loose structure, missing equipment or an unexplained modification. |
| Davit arms and foundation | Visual condition, securing, pivots, corrosion, deformation and access. | Cracks, abnormal movement, damaged welds, missing fasteners or structural doubt. |
| Falls and sheaves | Correct reeving, condition, alignment, terminations and guards. | Broken wires, kinks, birdcaging, corrosion, seized sheave or damaged termination. |
| Winch and brake | Operational test, controls, brake response, power supply and emergency arrangements. | Uncontrolled movement, slipping, abnormal sound, overheating or failed communication. |
| Release gear | Hooks, cables, indicators, interlocks and hydrostatic equipment as applicable. | Wrong indication, excessive free play, damaged cable, missing seal or uncertain setting. |
| Environment | Weather, sea state, traffic, lighting, ship motion and exclusion zones. | Conditions exceed limits or people cannot be kept away from danger areas. |
Weekly, monthly, annual and five-year maintenance
Maintenance intervals must come from SOLAS, the manufacturer’s maintenance manual, the flag administration, the company SMS and current service arrangements. A short blog cannot replace the equipment-specific checklist.
Under the requirements associated with MSC.402(96), weekly and monthly inspections and routine maintenance may be carried out by authorised service providers or shipboard personnel under the direction of a senior ship’s officer, following the maintenance manual. Annual thorough examinations and operational tests are carried out by certified personnel of the manufacturer or an authorised service provider. Five-year thorough examinations, overhauls, overload operational tests and repairs are also assigned to certified personnel of the manufacturer or an authorised service provider.
After the work, reports and checklists should be signed by the person who performed it and countersigned by the Company representative or Master. Records should remain onboard for the service life of the equipment. The company should also retain the provider’s certification and authorisation documents and the statement confirming that the lifeboat arrangements remain fit for purpose.
Release gear: the point where caution matters most
Release gear is not an ordinary latch. It may need to hold a loaded boat, release at the correct time and prevent an unsafe release when the craft is not waterborne. On-load and off-load mechanisms have different purposes, and the correct sequence depends on the approved design.
MSC.402(96) identifies release-gear checks including activation devices, excessive free play, hydrostatic interlocks where fitted, control and release cables and hook fastening. It also warns that setting and maintenance of release gear are critical operations. That warning should shape the culture onboard: a person should never adjust release gear because they believe it “looks wrong” without the required manual, authorisation, competence and verification.
What to do if a defect is found
Stop the operation and make the equipment safe. Report the defect to the responsible officer. Mark or isolate the equipment if required by the SMS. Enter the defect in the planned-maintenance or defect system, assess whether it affects the vessel’s emergency readiness and arrange the correct authorised repair or examination.
A missing certificate is not necessarily the same as a failed component, but it is still a compliance problem that must be resolved. A damaged fall, seized sheave, slipping brake, uncertain hook setting or cracked foundation is an operational safety problem. Do not hide either type of problem to make the drill or inspection appear successful.
STCW training: PST and survival-craft competence
Personal Survival Techniques, or PST, introduces basic survival knowledge and practical skills. It is not the same as the officer or rating qualification required to take charge of a lifeboat or rescue boat. Proficiency in Survival Craft and Rescue Boats, commonly called PSC or PSCRB, is the more specialised STCW competency for designated personnel.
DGMA’s life-saving-appliances information describes Proficiency in Survival Craft and Rescue Boats as an STCW certification requirement for designated crew members, assessed through practical drills and oral examination. It also describes the need for trained personnel assigned to each survival craft and rescue-boat station, with a qualified person in charge and a backup person.
When choosing training, a seafarer should confirm whether the employer needs PST, PSC/PSCRB, Fast Rescue Boat or a refresher course. The name “lifeboat course” is not precise enough. Check the exact approved course, eligibility, practical component, assessment and certificate before paying.
How to book genuine DGMA training or servicing
Confirm whether you will be a general crew member, lifeboat person in charge, backup person, rescue-boat crew member or fast-rescue-boat operator.
Use DGMA’s current approved-course list and confirm the exact course title. Do not rely only on a social-media poster.
Check the approved-MTI directory and any withdrawal or suspension notices relevant to the course and date.
Confirm tuition, practical pool or boat work, assessment, certificate, meals, accommodation, medical requirements, taxes and reattempt charges.
Save the invoice, receipt, attendance, result and certificate. Ask how the record is verified for joining, CDC or revalidation purposes.
Servicing is a separate question from seafarer training. DGMA states that only DGS-approved service stations may service inflatable life-saving appliances for Indian-flag vessels and foreign ships in Indian waters under the applicable framework. Ask for the service station’s approval details, competent-person information, equipment serial numbers, certificate numbers and service record.
What does gravity-davit compliance cost?
There is no universal “gravity davit inspection fee.” Costs depend on the number of lifeboats, davit type, boat capacity, service-provider location, manufacturer support, annual or five-year scope, winch-brake testing, release-gear work, test weights, access, class or flag attendance, repairs and replacement parts.
Request a written quotation that separates inspection, operational testing, five-year overhaul, authorised service, class or flag attendance, travel, consumables, wire replacement, hook or release-gear work, load testing and re-testing. A cheap certificate without the required authorised work is not a saving; it can leave the vessel and crew exposed.
Gravity-davit scams and unsafe shortcuts
- “Manual brake release for everyone”: the brake or emergency arrangement must be operated only by trained personnel under the approved procedure.
- Certificate without attendance: a PDF alone does not prove that the boat, davit, winch and release gear were examined.
- Unapproved service station: verify the service provider through DGMA, the Administration, manufacturer or recognised authority.
- Guaranteed pass or job: a lifeboat course cannot guarantee employment, a certificate without assessment or a safe outcome.
- Social-media launch videos: a video is not permission to repeat a manoeuvre on your ship.
- “One checklist fits all”: model-specific manuals and current service instructions control the work.
Frequently asked questions
How does a gravity davit lower a lifeboat?
The boat’s weight and davit geometry help move the craft outboard while a winch and brake arrangement control the descent. The exact operation depends on the manufacturer and ship-specific design.
Does a gravity davit work during a blackout?
Gravity-assisted movement may reduce dependence on ship power for part of the launching sequence, but the system still depends on correct setup, brake control, release arrangements, communication and safe conditions. Do not assume every davit is identical.
Who may service lifeboat release gear?
Maintenance, examination, testing, overhaul and repair must follow SOLAS, the manufacturer’s manual and the authorised-service-provider requirements. Use certified personnel and authorised providers for the applicable work.
How often is a lifeboat given a five-year examination?
Under MSC.402(96), five-year thorough examination, overhaul, overload operational tests and repair are carried out by certified personnel of the manufacturer or an authorised service provider. Confirm the schedule and scope with the vessel’s current statutory and manufacturer requirements.
Can the crew launch the boat during every drill?
Not necessarily. IMO safety guidance recognises controlled alternatives for some free-fall lifeboat drills and stresses preventing accidents. The Master and company should select a safe, approved drill method.
What course is needed to operate a lifeboat?
Requirements depend on the assigned duty. PST is basic survival training; Proficiency in Survival Craft and Rescue Boats is the specialised STCW competency for designated survival-craft personnel. Verify the current flag and DGMA requirement.
Final gravity-davit safety checklist
- Read the manufacturer’s current operating and maintenance manual.
- Confirm the lifeboat, davit, falls, sheaves, winch, brake and release gear are identified.
- Check that defects, restrictions and certificates are recorded onboard.
- Establish a command structure, communication method and exclusion zone.
- Keep people away from snap-back, bight, pinch, crush and suspended-load areas.
- Use only trained and authorised personnel for controls and release gear.
- Stop for abnormal noise, vibration, snagging, brake slip, poor alignment or lost communication.
- Use authorised service providers for annual and five-year work as applicable.
- Keep signed reports, statements of fitness and certificates for the equipment’s service life.
- Verify PST, PSCRB and related training through the current DGMA course and MTI lists.
A gravity davit is not impressive because it moves quickly. It is impressive because it moves a lifeboat predictably when the ship and crew need that predictability most. That depends on a maintained brake, sound falls, aligned sheaves, correctly set release gear, reliable records and a crew that knows when to stop.
The strongest lifeboat safety culture is built before the alarm. It is built when a seafarer reports a corroded fitting, when an officer refuses to use an uncertain certificate, when a service provider follows the manual and when a drill is stopped because the sea state has changed. Those decisions may never appear in a dramatic video, but they are what make a gravity davit a real lifeline.
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