Class societies require gangways and accommodation ladders to carry a certified safe working load, be fitted with compliant handrails and non-slip treads, and remain safe to use across the ship's operating range of angles. The rules cover the structure, its fittings and its ongoing inspection, not the ladder alone.
What class rules actually cover
Class societies such as Bureau Veritas, DNV and Lloyd's Register, working from IACS unified requirements, treat a gangway or accommodation ladder as a load bearing access structure rather than simple deck furniture. The rules fix a minimum safe working load that the ladder, its suspension points and its securing arrangements must carry without permanent deformation, and they require this load to be demonstrated by calculation and then proven by a physical test before the equipment goes into service.
The rules go beyond raw strength. They set minimum handrail height, maximum stanchion spacing, tread pitch and depth, the maximum angle at which the ladder may safely be used, and requirements for lighting and a safety net or equivalent arrangement underneath. A design that is strong enough to carry the load but awkward or dangerous to walk on will not pass review, because the rules exist to protect the person using the ladder, not just to certify a piece of steel.
Gangway or accommodation ladder: different fittings, different checks
The two terms get used loosely in everyday conversation but describe different equipment. An accommodation ladder is hinged at deck level and lowered over the ship's side so its lower platform reaches the quay or a boat, and it is designed to change angle as tide, loading or ballast alters the ship's freeboard. A gangway is usually a straighter structure, often mounted on wheels or rollers at one end, used where the height difference between ship and shore is smaller and more constant, such as alongside a fixed quay or a pontoon berth.
Class surveyors weight their checks differently for each. Accommodation ladders are assessed heavily on their safe range of operating angle, the strength of the upper platform and the davit or winch that raises and lowers them. Gangways are checked more on span, deflection under load, and the stability of both the shore end and the ship end supports, since an unsecured or sliding lower end is the most common cause of a gangway failure.
Some vessels, particularly those calling at a wide range of berths, carry both a gangway and an accommodation ladder and select whichever suits the actual berth on the day, since neither type covers every situation well on its own.
Structural requirements: load, handrails and treads
The safe working load figure that appears on the equipment's nameplate is not a marketing number, it is the outcome of a structural calculation covering the main beams, the tread supports, the suspension or wheel fittings and the connection points at both ends. Class rules require this calculation to be reviewed before construction and then confirmed by a proof load test, usually applying a load well above the stated working load and checking for permanent set afterward.
Handrails and treads are covered by separate, equally firm requirements. Handrails must reach a minimum height above the tread line, stanchions must be spaced closely enough that a person cannot slip through, and the whole rail assembly must resist a lateral push without excessive deflection. Treads must have a non-slip surface, adequate depth for a full footstep, and spacing that keeps the pitch comfortable and consistent along the full length of the ladder.
Materials, corrosion protection and safe rigging
Gangways and accommodation ladders live in one of the harshest environments on a ship, exposed to salt spray, sun and constant flexing every time they are raised, lowered or walked on. Steel structures are hot dip galvanised or coated to a marine specification, and treads are frequently made from aluminium or galvanised steel grating that drains water and grit instead of trapping it. Pins, hinges and rollers, the parts that see the most wear, are usually specified in stainless steel or another corrosion resistant alloy so that movement stays free over years of service.
Rigging is where good design meets good seamanship. Class rules and accepted practice call for the ladder to be tended by a lifeline, positioned so it cannot swing against the hull, and fitted with a properly secured lower platform before anyone steps onto it. A well built gangway from a specialist manufacturer such as Yeke Denizcilik, produced under Bureau Veritas certified quality control with WPQR qualified welding, makes this easier because the tolerances and fittings are consistent from delivery through years of use.
Certification and in service inspection
Before an accommodation ladder or gangway is accepted onto a vessel, it is normally proof load tested and certified by a class surveyor, and its design calculations and welding records are reviewed and filed against the ship's equipment register. This is a one time event tied to delivery, but it is not the end of the equipment's relationship with class.
Periodic surveys check the structure for corrosion, cracking, worn pins and hinges, and correct operation of any tensioning or angle adjustment mechanism, because a ladder that was fully compliant when new can drift out of tolerance after years of salt exposure and flexing. Crews are expected to carry out their own visual checks before each use, and any deformation, missing tread or damaged handrail should take the equipment out of service until it is repaired and, where required, re-certified.
Nameplate data, drawing references and survey dates are typically kept together in the ship's equipment file, so a surveyor beginning a routine visit can see at a glance which items are due and which have already been checked that cycle. This paperwork discipline is not bureaucracy for its own sake, it is what turns periodic inspection from a one time event into a continuous record of the ladder's condition over its whole service life. These records also help preserve continuity if the equipment changes hands or the vessel's flag changes.
Boarding safety in practice: crew responsibilities and typical failure points
Equipment that meets every class requirement on paper can still fail in service if it is misused. The most common practical failure points are an accommodation ladder left rigged at an angle steeper than its rated maximum as the tide falls, a lifeline that is present but not actually clipped on, and a lower platform that shifts because it was never properly secured to the quay or boat it rests against.
Good practice puts a simple routine around every use: check the angle is within range before anyone boards, confirm the lifeline and net are rigged, and re-check the securing of the lower end whenever the tide or loading has changed since the ladder was last set. None of this requires special equipment, only the discipline to treat the gangway as safety critical every time it is used, not just when a surveyor is watching. A short pre-use checklist posted near the ladder helps keep this habit consistent across different watches and crew members, and it costs nothing to put in place.