Passenger Shuttle Fleets: Maintenance Between Annual Surveys
A passenger vessel on domestic voyages is surveyed before it enters service, then surveyed again every twelve months, and its safety certificate is issued for no more than twelve months at a time. The regulatory calendar therefore fits on one line, and that is exactly what misleads: it describes two dates in the year, not what happens in between.
Yet the interval is where a shuttle fleet is actually run. A launch that turns round fifteen times a day in July and sits alongside in January does not wear at the pace of a calendar. A rotating crew does not spontaneously pass on what it noticed yesterday. And an operator who discovers the true condition of the fleet three weeks before the annual survey has already lost.
The essentials
Most flag regimes follow the same rhythm: an initial survey, a periodical survey every twelve months, and additional surveys as circumstances require.
The safety certificate runs for twelve months at most, which makes the annual survey a gate rather than a formality.
Seasonal operation concentrates wear into a few months, so scheduling on running hours beats scheduling on dates.
What is not logged on board the same day is generally never logged at all.
What regulation sets, and what it leaves open
In France, Division 223 of the national safety regulations governs passenger ships on domestic voyages. It sorts vessels into four classes according to the area of operation, sets requirements for hull, stability, machinery and electrical installations, and lays down a survey regime: an initial survey before entry into service, a periodical survey every twelve months, and additional surveys where circumstances demand. Other European flag administrations apply a comparable pattern.
What the text does not say is how the operator keeps the vessel between two surveys. No record format is imposed, no tool prescribed. The latitude is complete, and that is where practice diverges: some operators track each unit day by day, others find out how their fleet stands when the surveyor lifts the engine hatch.
The risk is not decided on survey day
Port state control statistics, although they cover larger ships, give a useful indication of what inspectors find. In the Paris MoU annual report for 2025, fire safety accounts for 16.8% of recorded deficiencies, ahead of structural and electrical elements. Fire doors alone represent 3.1% of findings.
These are rarely dramatic failures. They are safety items checked less often precisely because they are not used in normal service: an extinguishing system, emergency lighting, a stand-by bilge pump. A passenger vessel exercises its propulsion and ship's electrical systems daily; it exercises its safety systems almost never. Hence the gap.
Schedule on the counter, not on the date
Passenger operation has a feature that calendar maintenance handles badly: seasonality. A shuttle running six hours a day from June to September accumulates in one summer what a steadily used vessel takes a year to reach. Scheduling an oil change every six months then means doing it too early in winter, or far too late in August.
Tying each job to an hour counter rather than a date settles the problem at source. The due point follows the machine's actual use, triggers when it should, and stops depending on the judgement of whoever keeps the schedule. That is the principle behind a marine CMMS, as opposed to maintenance tools designed for industry.
Logging happens on board, not in the office
This is where most arrangements fail, whatever tool has been chosen. A master who notices something between two turnarounds has a few minutes alongside. If logging it means waiting until evening, opening a laptop and finding the right file, the information is lost. If it takes three taps on a phone, offline included, it gets done.
The consequence goes beyond convenience. A history built as work happens lets you show a surveyor what was done, when and by whom; a history reconstructed the night before is visible as such, and protects nobody after a casualty. It is also what separates a maintenance record that stands up from one that merely exists.
What changes at fleet scale
With one vessel, an attentive operator manages with a notebook and memory. From three or four shuttles onward, memory no longer serves: you need to know, at any given moment, which unit is available, which has an overdue job, and which is approaching a certificate expiry. That is precisely what a fleet dashboard produces.
Crew management comes with it, and matters as soon as several teams rotate across a short season. Hours of work, rest and leave belong in the same tool as maintenance, failing which the roster lives in one spreadsheet and the operation in another. The individual functions are set out in the BoatOn Book modules, and the passenger vessel page shows what that looks like in service.
One thing no software replaces: the annual survey does not create compliance, it records it. What happens during the other eleven months decides what the surveyor finds in the twelfth.
Sources: French Division 223 on passenger ships engaged on domestic voyages; Paris MoU annual report on port state control for 2025. Illustrative photograph.
