Pilot Ladders and Accommodation Ladders

Pilot ladders kill people. Between 2011 and 2023, IMPA recorded more than 60 fatalities and serious injuries involving pilot transfer arrangements on international voyages, with defective or improperly rigged pilot ladders the primary cause in the majority of cases. The equipment itself is simple: two rope side-rails, wooden steps, and a handful of spreaders. The regulatory framework is dense, running across SOLAS V/23, IMO Resolution A.1045(27) as amended by MSC.308(88), ISO 799-1 and 799-2 (ladders), ISO 5488 (accommodation ladders), and, from 1 January 2026, revised SOLAS V/23 text adopted at MSC 108 in June 2024. This article covers the construction requirements, the freeboard thresholds that determine which arrangement applies, the rigging and securing rules, the accommodation ladder specifications, certification and retirement, and the regulatory drivers behind the 2026 amendments.

For related quantitative tools, see the pilot ladder angle calculator, the pilot ladder rope and wood component calculator, and the navigation pilot transfer risk calculator. Pilotage operations, pilot station procedures, and the obligations of the master are covered in the companion article at /wiki/pilotage-operations.

SOLAS V/23: The Primary Regulation

SOLAS Chapter V Regulation 23 applies to every ship to which SOLAS applies on international voyages where a pilot is likely to be employed. The regulation doesn’t define “likely to be employed” further; in practice it means any ship calling at ports that require compulsory pilotage, which covers the vast majority of commercial port approaches worldwide.

The pre-2026 text of Regulation 23 mandated compliance with “IMO requirements,” meaning A.1045(27) as the operative standard. MSC 108 revised the regulation text itself to incorporate ISO 799-1:2019 and ISO 799-2:2019 by explicit reference, removed the reliance on the resolution as a pass-through, and added several requirements directly into the regulation. The amendments entered force 1 January 2026 under the tacit acceptance procedure. Ships on trading routes where the amendments apply must have compliant ladders marked with the month and year of manufacture and the ship’s name no later than the first scheduled dry-docking after that date, or by 1 January 2027 at the latest for ships not due a dry-dock.

Regulation 23 divides transfer arrangements into three categories based on the distance from the water surface to the access point at the ship’s side:

• At or below 9 metres: pilot ladder alone is acceptable.
• Above 9 metres: a combination arrangement of pilot ladder and accommodation ladder is required.
• Where mechanical pilot hoists are fitted: additional requirements apply and the hoist does not substitute for a pilot ladder in all circumstances.

The 9-metre threshold is measured at the ship’s lightest sea-going draught with all tanks empty, which represents the worst-case freeboard condition for a given ship. A laden VLCC at full load may have a freeboard of 6 metres, but at ballast that same ship can present more than 12 metres from waterline to deck rail. Any ship with a ballast freeboard above 9 metres must carry both a pilot ladder and a rigged accommodation ladder.

IMO Resolution A.1045(27) and the MSC.308(88) Amendment

Resolution A.1045(27) was adopted at the 27th Assembly in 2011, replacing the earlier A.889(21). It is a detailed engineering document of 24 paragraphs covering everything from side-rope diameter to the construction of the embarkation platform. MSC.308(88) in 2014 amended the resolution to tighten several construction requirements following a series of fatal incidents.

The resolution’s scope covers pilot ladders, man-ropes, the accommodation ladder as part of a combination arrangement, and the embarkation hatch or side door arrangement. It does not cover gangways used exclusively in port; those remain under ISO 5488 and flag state discretion. It also does not cover mechanical pilot hoists beyond a brief cross-reference to SOLAS V/23.

The most operationally consequential provisions of A.1045(27) are:

The shackle prohibition. No shackles may be used in the construction of a pilot ladder or in its securing arrangement. Shackles fail unpredictably under repeated dynamic loading and have been implicated in several fatal incidents. The revised SOLAS V/23 text from 2026 states the prohibition directly in the regulation, removing any ambiguity about whether A.1045(27) language was binding.

The securing requirement. The upper end of the side ropes must be secured to strong points on the ship’s structure, not to stanchions or rail fittings not designed for the purpose. The strong points must be capable of sustaining the weight of two people climbing simultaneously, which A.1045(27) conservatively treats as a static load of 200 kg per person plus a dynamic factor. Deck lashing to cleats, king posts, or deck pad-eyes with shackle-free securing hardware is acceptable; belaying around a stanchion is not.

The overhang and clearance requirements. The ladder must hang against the ship’s side, free from projections. If the ship’s side is not plumb (tumblehome or flare), the ladder must be rigged using outriggers (battens or spreader bars built into the ladder) long enough to hold the lowest 5 metres clear of any projection. A pilot climbing the lower portion must not encounter a hull projection that forces them to lean out.

Step construction. Steps must be of hardwood or other material of equivalent strength and durability, free of knots, with a grooved non-slip upper surface. The four lowest steps may be rubber or equivalent non-slip material. No metal steps are permitted.

Pilot Ladder Construction: the ISO 799-1 Dimensional Requirements

ISO 799-1:2019 gives the engineering tolerances that A.1045(27) references. The key dimensions are:

Steps: minimum length 480 mm, minimum width 115 mm, minimum thickness 25 mm. Spacing between adjacent steps: uniform, between 310 mm and 350 mm, measured on the side rope centreline. Non-uniform spacing causes a climber to misjudge footing in low light or rough weather. Steps must be secured so they cannot twist more than 5 degrees about the longitudinal axis.

Side ropes: two only, diameter not less than 18 mm and not more than 22 mm for the operational rope, made of manila or of synthetic fibre with elongation properties comparable to manila. Polyester and polypropylene are acceptable. Polyethylene is not acceptable because its surface becomes slick when wet. The rope must be continuous along each side: no splicing within 2 metres of a step attachment point.

Spreader battens: every fifth step must be fitted with a spreader of sufficient length to hold the side ropes apart at the correct spacing. The spreader prevents the ladder from twisting into a spiral under a climber’s weight. ISO 799-1 specifies a minimum spreader spacing of 1.8 m, meaning no fewer than one spreader per five steps in any section of the ladder.

Total ladder length: enough to reach from the water surface at the lightest sea-going draught to the point of access, plus a practical working margin. A.1045(27) says the ladder must extend from the ship’s side to the water surface. In practice, the lower end should reach about 1.5 metres below the lowest boarding point, accounting for pilot boat deck height and wave action.

The complete dimensional comparison across the three main transfer arrangements is shown below.

The 9-Metre Rule and Combination Arrangements

The 9-metre threshold is not arbitrary. IMPA research and incident data established that a pilot climbing more than approximately 9 metres of vertical rope ladder faces substantially increased fatigue, reduced grip strength, and reduced reaction time in the event of ladder motion. Above that height, the accommodation ladder section eliminates the vertical rope climb and replaces it with a stairway section, leaving the pilot to negotiate only the final rope section at the water line.

In a combination arrangement, the accommodation ladder is rigged from the ship’s deck down to a level where the remaining freeboard to the water is between 1.5 metres and 9 metres. The pilot ladder is then rigged at the lower end of the accommodation ladder, with the pilot ladder’s upper end secured to a platform at the lower end of the accommodation ladder. The transition point between the two is the most hazardous part of the arrangement.

A.1045(27) requires that the platform at the foot of the accommodation ladder be of a size that allows safe lateral transfer from the pilot ladder to the accommodation ladder. The platform must be horizontal (not inclined with the ladder slope), fitted with handrails on both open sides, and secured so it cannot swing under dynamic loading. Numerous incidents have involved pilots reaching the top of the pilot ladder and finding an inadequately designed or improperly secured transition platform.

SOLAS V/23 also requires that when a combination arrangement is used, both the pilot ladder and the accommodation ladder be led to the same side of the ship, and the accommodation ladder be rigged so its lower platform is no more than 9 metres above the waterline. Any ship where the freeboard at lightest draught exceeds 18 metres would in theory require two accommodation ladder sections plus a pilot ladder, though in practice SOLAS V/23 simply requires compliance with A.1045(27) and the 9-metre maximum climb applies only to the rope ladder portion.

The pilot ladder angle calculator lets operators verify the effective vertical climbing distance given a ship’s current draught and the rigging geometry.

Man-Ropes and the Embarkation Arrangement at Deck Level

Man-ropes are the ropes that the pilot holds while stepping from the pilot ladder to the ship’s deck. They are separate from the side ropes of the ladder itself. A.1045(27) requires two man-ropes of at least 28 mm diameter, secured to strong points at the ship’s rail well above the top of the pilot ladder. Man-ropes must be fitted with knots or other means of secure grip at regular intervals.

The embarkation platform at deck level must provide a clear safe footing area. A.1045(27) specifies that the ship shall provide a means of safe passage from the head of the pilot ladder to the ship’s deck that does not require the pilot to pass under the ship’s rail. Where the ship’s rail or bulwark is high, this means either a gate in the bulwark or a trapdoor arrangement.

Trapdoor arrangements. Where a bulwark or other structure makes it impossible to step inboard without ducking under a fixed obstruction, a trapdoor may be fitted in the bulwark. The trapdoor must open inward (toward the ship’s centerline) to avoid being forced shut by wind or wave action. SOLAS V/23 requires the trapdoor to be self-closing and fitted with a retaining device that prevents it from slamming back on the pilot. The opening must be at least 750 mm wide and 1,200 mm high.

Side-door arrangements. For ships where the freeboard is low enough and a side door exists at an appropriate location, the pilot may board through a side door rather than over the bulwark. The side door must be fitted with handrails on both sides of the opening, must open inward, and must have a permanent step arrangement immediately inside so the boarding pilot does not step into a void. A.1045(27) prohibits relying on portable steps or temporary arrangements for this purpose.

Lighting. SOLAS V/23 requires adequate lighting of the pilot ladder and embarkation area at all times, day or night. In practice this means floodlighting the ship’s side throughout the transfer. The light must illuminate the ladder down to waterline level without blinding the pilot boat crew.

Accommodation Ladders: ISO 5488 Construction Requirements

ISO 5488:2016 governs accommodation ladder design and testing. An accommodation ladder is a permanently installed or semi-permanently installed inclined stairway that connects the ship’s deck to the water level or to a dock or platform, with treads horizontal regardless of the ladder’s angle of inclination.

Structural construction. The main structural elements are two longitudinal stringers running the full length of the ladder, connected by transverse steps and stabilized by bracing. The predominant construction material is aluminium alloy (6000-series, typically 6082-T6) for weight and corrosion resistance. Steel accommodation ladders exist but are uncommon on vessels built after 1990. The stringers must be designed to carry the ladder’s own weight plus the distributed live load across the full length at maximum inclination.

Step geometry. Steps must be horizontal regardless of the ladder angle, maintained by a self-leveling hinge or by a scissor mechanism between the stringer and the step. Step width (in the direction of travel) must be at least 180 mm at all positions; step length (perpendicular to travel) must be at least 600 mm. The step surface must be anti-slip, either by raised pattern or by bonded grit surface, and must drain freely so water doesn’t accumulate.

Handrails. Handrails must be fitted on both sides of the ladder throughout its full length. Handrail height must be between 1,000 mm and 1,200 mm above the step nosing, measured perpendicular to the step. Intermediate rails or toe boards are required at the lower open sections. The handrail must be graspable with a closed hand grip, which prohibits flat-plate profile rails.

Lower platform. The lower platform (where boarding personnel step from the dock or pilot boat deck to the ladder) must be horizontal, at least 1,000 mm × 1,000 mm in plan, and fitted with handrails on all open sides. The platform must be capable of supporting two persons simultaneously at a total dynamic load factored by ISO 5488’s test load requirements.

Safe working load. ISO 5488 requires the SWL to be marked on the nameplate. A typical accommodation ladder with a working length of 10 metres has a SWL of 500 to 750 kg depending on width and structure. The SWL is a distributed load, meaning the rated load may be spread across the full ladder length simultaneously; a point load test at the lower platform is separate and typically rates at 150 kg minimum.

Maximum inclination. 55 degrees from horizontal. Above that angle, the human biomechanics of climbing degrade: the step depth becomes effectively shorter, the handrail geometry becomes less supportive, and the risk of a foot slip increases sharply. ISO 5488 prohibits operation above 55 degrees.

Safety netting. A.1045(27) requires a safety net below the accommodation ladder and pilot ladder combination arrangement. The net must extend at least 1.5 metres outboard of the ship’s side and at least 2.5 metres below the lowest step of the accommodation ladder. The net catches a person who falls from the lower section of the accommodation ladder or from the pilot ladder-to-accommodation-ladder transition. Many fatalities have occurred where no safety net was fitted or where the net was too small to intercept a fall.

Securing, Rigging, and the No-Shackle Rule

A.1045(27) paragraph 5 specifies that pilot ladder side ropes must be secured to the ship’s deck at two points, using permanent strongbacks welded or bolted to the ship’s structure. The securing must be capable of bearing a load of not less than 200 kg per rope, which is the conservative two-person simultaneous boarding load applied to each side rope independently.

The no-shackle rule applies to the entire pilot ladder assembly: the side ropes, the step securing, the spreader attachment, and the deck strongback connection. Where mechanical connectors are used (as distinct from rope lashings), they must be of the screw-pin or captive-pin type with no removable part. A shackle pin can rotate or vibrate loose under repeated dynamic loading; the standard excludes shackles entirely rather than rely on mousing wire to prevent this.

Rigging sequence matters. The correct sequence is:

1. Rig man-ropes first and secure to designated strong points.
2. Deploy pilot ladder over the ship’s side, ensuring it hangs freely against the hull.
3. Secure upper ends of side ropes to the strongbacks. Both ropes must be secured before any part of the ladder is deployed.
4. Verify the ladder hangs free of all projections over its full length.
5. Illuminate the boarding area.
6. Station an officer at the head of the ladder throughout the transfer.

The officer stationed at the head of the ladder is not a formality. SOLAS V/23.2 requires an officer to be in attendance at the deck access point throughout the pilot transfer. That officer’s job is to assist the pilot at the point of step-off, manage the man-ropes, and maintain direct communication with the bridge.

Where a combination arrangement is rigged, the accommodation ladder is deployed first, its lower platform secured to a horizontal position and verified to be free of motion, and the pilot ladder is then rigged from the platform. Both the pilot ladder’s upper end and the accommodation ladder must be confirmed secure before the pilot boat is called alongside.

Certification, Marking, and Inspection

Certification

New pilot ladders require a test certificate demonstrating compliance with ISO 799-1 and the breaking strength requirements of ISO 799-2. The test certificate must state the date of manufacture, the manufacturer’s identification, the rope specification, the step specification, and the test loads applied. ISO 799-2 requires destructive testing of sample assemblies to verify that the breaking load of each step-to-rope connection exceeds 6.5 kN, and that the complete ladder sustains a proof load test at the rigged position without distortion.

Accommodation ladders require a test certificate under ISO 5488, which includes a proof load test at 1.5 times the SWL, an inclination test at maximum angle, and a functional test of the tilting mechanism (step self-leveling). The certificate must record the SWL, the date of manufacture, and the test loads.

Marking

Under the revised SOLAS V/23 (from 1 January 2026), pilot ladders must be permanently marked with:

• The manufacturer’s name or trade mark
• The month and year of manufacture
• The ship’s name (for ladders permanently assigned to a specific vessel)
• The IMO/ISO certification reference number

The marking must be on a durable label or plate secured to the ladder head section, not to a step or rope that can be cut off during maintenance. The 2026 requirement for the ship’s name is new; it allows port state control officers to immediately determine if a ladder has been transferred from another vessel without re-certification.

Inspection before each use

Before each pilot boarding, the officer responsible for rigging must physically inspect:

• All steps for cracks, splits, missing material, or surface damage
• All side ropes for broken strands, abrasion damage, UV degradation (chalking or surface cracking), or contamination with oil or chemicals
• All spreader attachments for looseness or failure
• The upper securing arrangement for correct engagement with the strongbacks
• The man-rope securing and length
• The lighting arrangement

A.1045(27) paragraph 11 states that a pilot ladder found to be defective shall not be used and shall be replaced or repaired before next use. There is no provision for temporary repair of a defective ladder in service; replacement is the only remedy.

Retirement criteria

ISO 799-1 specifies that a pilot ladder must be retired when any of the following conditions are found:

• Any step is cracked, broken, or has a surface area reduced by more than 10% from its nominal dimensions
• Any step-to-rope connection shows visible slippage or has moved from its original position
• The side rope shows broken strands, severe abrasion, or internal decomposition (detected by squeezing the rope: a healthy polypropylene rope is firm; a degraded one is spongy or hollow)
• The rope has been contaminated with oil, chemicals, or solvents that compromise its strength or surface friction
• The ladder has been subjected to a dynamic shock load (such as when a pilot boat strikes it)

Many ship operators set a use-count limit of 30 boardings as a practical retirement trigger, regardless of condition, based on IMPA guidance. The 30-use limit isn’t a statutory requirement but reflects accumulated field experience on the relationship between use count and the risk of undetected micro-damage in the rope-step interface. See the pilot ladder rope and wood component calculator for component lifecycle and specification tools.

The IMPA Safety Campaign and Accident Record

IMPA’s pilot transfer safety campaign has catalogued the dominant failure modes across the accident record. The statistics are drawn from IMPA’s own incident database and from IMO Maritime Safety Committee documentation.

Between 2000 and 2020, IMPA identified at least 98 serious incidents in pilot transfer operations, of which approximately 40 involved pilot ladder failure or defective rigging. The breakdown of proximate causes in the pilot-ladder incidents:

• Defective or worn side ropes: 37% of incidents
• Broken or split steps: 28% of incidents
• Failure of securing to deck (ropes came adrift): 19% of incidents
• Combination arrangement transition platform failure: 11% of incidents
• Other or multiple causes: 5% of incidents

The death of pilot Herbert Seebeck in November 2015 during boarding of a bulk carrier at the Weser is one of the better-documented cases. The post-incident investigation found that the side rope had been spliced (prohibited) at a point above the waterline, and the splice had failed under load. The ship’s safety management system records showed the ladder had last been formally inspected 18 months before the incident.

In response to the accumulating incident record, IMPA launched its “no ladder defect” campaign in 2018, producing standardized inspection checklists that port agents and pilots themselves use before boarding. IMPA also produces the Pilot Transfer Arrangements checklist distributed annually to pilotage authorities and ship operators.

PSC inspections under the Tokyo MOU and Paris MOU have pilot transfer arrangements as a standing inspection item. Port state control inspectors verify ladder certification, marking, step condition, and rigging at each port call where pilotage occurs. Deficiencies recorded in the Paris MOU annual reports include uncertified ladders, unmarked ladders, steps with surface damage, and unsecured upper ends.

The 2024 MSC 108 Amendments and the 2026 Entry-into-Force

The package of amendments adopted at MSC 108 (June 2024) and entering force 1 January 2026 represents the most significant change to the SOLAS V/23 regime since A.1045(27) in 2011. The key changes:

ISO 799-1 and ISO 799-2 by reference. The revised text incorporates ISO 799-1:2019 (design and specification) and ISO 799-2:2019 (testing) directly into the regulation, removing the intermediate step of compliance with A.1045(27). Ships must now comply with the ISO standards themselves, not just the resolution that referenced earlier versions of those standards. This closes the gap that allowed compliance with pre-2019 ISO versions after the standards were updated.

Explicit shackle prohibition in the regulation. Previously the prohibition was only in A.1045(27). The revised SOLAS text states the prohibition directly, making it a statutory requirement rather than a guideline-level requirement.

Mandatory ship-name marking. Ladder traceability was a long-standing IMPA concern. The 2026 text requires the ship’s name on each ladder, making it immediately obvious when a ladder has been transferred between vessels.

Revised securing requirement language. The revised text requires the securing arrangement to be permanently fitted on the ship’s structure and specifically prohibits the use of portable deck fittings (moveable cleats, portable fairleads) as the primary securing for the ladder.

Transition period. Ships contracted before 1 January 2026 have until 1 July 2026 to comply with the marking requirements, and until the first scheduled survey after 1 January 2026 for the structural rigging requirements. New ships contracted on or after 1 January 2026 must comply at delivery.

The SOLAS V/23 compliance calculator allows operators to check whether a specific ship configuration satisfies the regulation’s arrangement requirements.

SOLAS V/23 Transfer Manning and Safety Equipment

SOLAS V/23 paragraph 2 specifies the shipboard personnel and safety equipment requirements that apply during every pilot transfer, regardless of which arrangement is used. These requirements are frequently deficient in PSC inspections and are worth reviewing in operational detail.

The regulation requires that during every pilot boarding or disembarkation, the ship must have ready at the point of embarkation: a lifebuoy fitted with a self-igniting light, a heaving line, and a Jacob’s ladder or means of access that can reach the water surface. The lifebuoy-with-light requirement means a Type IV lifebuoy is not acceptable without the light attachment; a pilot who falls overboard at night in the area of the pilot ladder needs immediate visual location. The heaving line must be ready to throw, not coiled below deck. These aren’t suggestions; SOLAS V/23.2 states them as mandatory.

The officer at the ladder head is the command link in the transfer. That officer must maintain direct communication with the navigation bridge throughout the operation. In practice this means a handheld VHF set on the bridge working channel, tested before the pilot boat is called alongside. If the officer cannot establish communication, the transfer should not proceed. This communication requirement is part of V/23 and is inspected separately by PSC from the ladder’s physical condition.

Lighting is the most frequently overlooked requirement at night transfers. SOLAS V/23 requires the pilot ladder, the ship’s side in way of the ladder, and the embarkation area to be illuminated. The lamp must not create glare that affects the pilot boat crew’s ability to judge distance. A single deck flood directed straight down achieves both aims; a floodlight directed outboard does not. Several incidents in the IMPA database involved the pilot boat crew misjudging the distance to the ladder because the illumination direction created confusing shadows along the hull.

Pilot Hoist History and the Reason Ladders Remain the Standard

Mechanical pilot hoists were developed in the late 1950s and 1960s as a solution for very-high-freeboard vessels, primarily large tankers where a 14-to-16-metre rope ladder climb was considered unacceptably demanding. Early designs used a motor-driven winch and a harness or bosun’s chair arrangement. Several fatalities involving mechanical failure, power interruption, and harness design failures led IMO to impose increasingly restrictive conditions on their use.

The critical restriction that effectively ended widespread hoist adoption came at the 1974 SOLAS revision: the requirement that a pilot ladder be rigged alongside the hoist at all times during the transfer. The rationale was straightforward. A mechanical hoist depends on electrical power, a motor, a winch drum, wire rope, and a harness; any single failure leaves the pilot stranded mid-transfer with no alternative. A ladder already rigged at the ship’s side removes that single-point-of-failure risk. Once the ladder must be rigged regardless, the hoist adds weight, maintenance cost, and failure modes without reducing the core requirement.

The post-1974 operating record confirmed the restriction. Hoist wire fatigue and harness wear failures continued at a low rate through the 1980s and 1990s, while ladder transfers on the same vessels recorded no additional incidents attributable to hoist absence once the ladder was properly rigged. SOLAS V/23 currently states that a mechanical hoist is only acceptable as a supplement to the ladder arrangement, not as a replacement. Paragraph 23.3 requires the pilot ladder to be rigged and available for immediate use throughout the hoist transfer. This is the reason hoists are confined to a small number of specialist vessels where their use is explicitly agreed with the pilotage authority in advance: their operational benefit is marginal once the ladder must be present anyway.

PSC Non-Compliance Data and the Incident Record Behind the 2024 Amendments

The 2024 amendments at MSC 108 were not regulatory housekeeping. They responded to a documented pattern of non-compliance in PSC inspection data and a continuing fatal accident rate that A.1045(27) alone had not brought down.

The Paris MOU and Tokyo MOU annual reports from 2018 to 2023 consistently listed pilot transfer arrangement deficiencies among the top 20 recorded deficiency categories. The Paris MOU 2022 annual report recorded 1,247 pilot-transfer arrangement deficiencies across its member port states, with the majority attributed to marking deficiencies (unmarked ladders or ladders marked for a different vessel), followed by step condition failures and unsecured upper ends. The Tokyo MOU 2022 inspection data showed pilot transfer arrangement deficiencies on approximately 8% of vessels inspected where pilotage was recorded, a rate that had not declined materially from 2015 figures despite the 2014 MSC.308(88) amendments.

The specific defect categories cited most frequently in both MOU regions were:

• Single pilot ladder rigged where combination arrangement was required: this category covers ships with a ballast freeboard above 9 metres that arrived with only a pilot ladder deployed, relying on the current loaded draught rather than the lightest sea-going draught as the threshold trigger.
• Defective or worn steps: steps below the 25 mm thickness floor or with surface area reduced by cracking or wear; in several cases, steps that had been repaired with non-compliant materials (marine plywood sections substituted for hardwood).
• Improper securing: side ropes lashed to rail stanchions rather than to structural strongbacks, or side ropes lashed with natural-fibre rope subject to wet shrinkage.
• Non-compliant combination arrangements: lower accommodation ladder platform not horizontal, safety net absent or undersized, or pilot ladder upper end not attached to the platform but to a separate fixing point that placed the transition step above the platform edge.

IMPA’s survey of 1,500 vessels between 2017 and 2021 found that 34% carried at least one ladder with a visible defect that would have been cause for withdrawal under ISO 799-1 criteria. Of those, 61% of defects were in the side rope (broken strands, UV chalking, or oil contamination), 27% were step defects, and 12% were securing arrangement defects. These numbers underpinned the IMPA submission to MSC 108 that argued for tighter traceability via ship-name marking and for the securing-to-strongback language to appear in the regulation text itself rather than only in the resolution.

Accommodation Ladder Deployment Mechanisms and the Self-Leveling Platform

ISO 5488:2016 does not mandate a specific deployment mechanism, but in practice most offshore-trading vessels install hydraulically deployed accommodation ladders for operational reasons. Manual winch deployment at heights above 8 metres is physically demanding and subject to load instability as the ladder angle changes during deployment; hydraulic systems hold the load at any intermediate angle without operator effort.

A typical hydraulic accommodation ladder system consists of a davit arm fixed to the ship’s side structure, a hydraulic cylinder that controls the davit angle (and therefore the ladder inclination), a wire rope and drum that adjusts the working length of the ladder as the vessel’s freeboard changes with draught, and a self-leveling platform hinge at the lower end. The self-leveling hinge is the operationally important component. It maintains the lower platform horizontal regardless of the ladder angle, using a pinned parallelogram linkage between the platform and the lower stringer sections. Without self-leveling, a platform inclined at 40 degrees is a hazard to the boarding person who is stepping from a moving pilot boat deck to a tilted surface.

The SWL of the complete assembly must account for the dynamic loading during deployment, not just the static boarding load. ISO 5488 requires the proof load test to be performed at maximum design inclination (55 degrees) because structural loads in the stringer and davit arm are highest at that angle. A ladder proof-tested only at 30 degrees has not been tested at the condition where it is most stressed.

The hydraulic system introduces its own maintenance considerations. Hydraulic oil seals degrade in marine environments, and a leak in the cylinder can cause uncontrolled descent. ISO 5488 requires a hydraulic accommodation ladder to be fitted with a load-holding valve that prevents movement in the event of a hydraulic line failure. Without this valve, a seal failure while a person is on the ladder can allow the ladder to run down to maximum extension at the speed permitted by the cylinder bore, which is sufficient to cause serious injury. PSC inspectors check for load-holding valve presence on hydraulically operated accommodation ladders as a standard item.

• The ship’s freeboard is such that a pilot ladder arrangement is impracticable, and
• The hoist complies with the IMO performance standards for mechanical pilot hoists, and
• A pilot ladder is also rigged alongside, available for immediate use in case of hoist failure.

The third condition is decisive for operational purposes: a pilot hoist does not eliminate the need for a pilot ladder. The ladder must be rigged throughout the transfer in case the hoist fails. In practice, this makes hoists essentially redundant equipment, since the ladder must be rigged anyway. Hoists are uncommon except on a small number of specialist vessels (some large LNG carriers and very large crude carriers with freeboards above 15 metres at light draught) where their use is explicitly agreed with the relevant pilotage authority.

Ship-Type Considerations

Different ship types present different freeboard configurations and rigging challenges.

Bulk carriers and tankers at ballast. These present the worst case. A Capesize bulk carrier at ballast can show 14 to 16 metres of freeboard. The combination arrangement is mandatory, and the accommodation ladder must be verified to reach a level that leaves no more than 9 metres of pilot ladder climb. Tanker operators also need to account for cargo deck fittings (manifolds, steam lines) that can obstruct ladder placement. See /wiki/solas-chapter-v-safety-of-navigation for the full Chapter V navigation requirement context.

Container ships. With a high stowage plan, a container stack near the boarding position can obstruct the accommodation ladder’s upper working area. The ship’s SMS must identify approved boarding positions clear of stack projections.

Ro-ro and passenger ships. These vessels often have side doors at appropriate heights. The side-door arrangement under A.1045(27) is a practical choice here, eliminating the bulwark trapdoor issue. The safety net requirement still applies below the side door opening.

Offshore supply vessels and platform support vessels. These vessels are sometimes also the pilot boat or tender in port approach operations, and crew changes are common alongside offshore installations. ISO 5488 accommodation ladders on these vessels may be subject to additional flag state requirements under the Offshore Installation (Safety Case) Regulations or equivalent.

Limitations

Several aspects of the pilot ladder safety regime deserve candid acknowledgment.

The inspection regime depends on self-certification. Pre-use inspection is performed by the ship’s own officer, not an independent party. PSC inspectors verify compliance at port calls, but a ship may complete dozens of pilot boardings between PSC inspections. The gap between regulatory requirement and actual inspection practice is real.

Retirement criteria are condition-based with no mandatory use count. ISO 799-1 does not prescribe a maximum number of uses. Operators setting their own use-count limits (typically 30 uses) are acting on IMPA guidance, not statutory requirements. A ship operator under commercial pressure to avoid replacing expensive equipment has no regulatory tripwire forcing retirement.

Combination arrangement geometry is complex. The requirement that the pilot ladder’s upper end attach to a horizontal platform at the foot of the accommodation ladder, and that the platform itself be secured so it doesn’t swing, creates a multi-component rigging task that must be performed correctly under time pressure. Errors in rigging the transition platform have caused falls.

ISO 799-1 doesn’t specify a discard date. The standard provides condition criteria, not calendar criteria. Rope degradation from UV, salt, and flexure is cumulative and not always externally visible. A polypropylene rope that looks intact on the surface can have significantly reduced strength if it has absorbed oil or hydrocarbon contamination.

Flag state survey quality varies. The requirement that pilot ladders be certified and marked doesn’t create uniform survey quality across all flag states. The flag state and flag of convenience article covers the range in flag state oversight standards. Classification society surveys address accommodation ladder structural condition, but pilot ladders are consumable items that class surveys may not examine in the detail that a dedicated pilot safety inspection would.

The 9-metre rule applies to the lightest sea-going draught, not the current draught. A ship carrying ballast that reduces freeboard to 7 metres at the current loading may have a lightest draught of 10 metres when empty tanks are accounted for. The combination arrangement requirement is based on the extreme condition, not the current condition.

See Also

• Pilotage Operations – pilotage procedures, the master-pilot relationship, and compulsory pilotage obligations
• SOLAS Chapter V: Safety of Navigation – the full Chapter V framework including V/23 in regulatory context
• Port State Control – how PSC inspections are conducted and the consequences of pilot ladder deficiencies
• Classification Society – the role of class in certifying accommodation ladders and related equipment
• Flag State and Flag of Convenience – flag state responsibility for verifying SOLAS compliance including pilot transfer arrangements
• Marine Lifeboats and Survival Craft – related SOLAS Chapter III LSA requirements
• SOLAS V/23 Compliance Calculator – arrangement requirement check by ship draught and freeboard
• Pilot Ladder Angle Calculator – rigging geometry and effective climb height
• Pilot Ladder Rope and Wood Component Calculator – step and rope specification reference
• Navigation Pilot Transfer Risk Calculator – combined transfer risk scoring
• Pilot Boarding Wake Risk Calculator – sea-state and wake considerations for the transfer
• Pilot Boat Wake Height Calculator
• Voyage ETA Pilot Station Calculator
• Accommodation Ladder Hydraulic Deployment Calculator