Registered Ship Surveyor common mistakes
Registered Ship Surveyor · Understand the traps and how to avoid them.
When applying SOLAS or MARPOL amendments, candidates cite the regulation as it stood at the time of the survey rather than the version in force on the date of construction or the date of the applicable survey, and they fail to state the entry-into-force date they are relying on.
Study notes often summarise the current consolidated text without amendment histories, so candidates memorise a single version and never practise applying the 'as amended' and 'ships constructed on or after' logic to a scenario.
What to do instead
For each convention, build a one-page amendment timeline showing entry-into-force dates and the construction-date cut-offs; when answering, explicitly write the regulation number, the amendment version, and the in-force date before applying it to the vessel's date of construction and survey.
Candidates calculate hull girder section modulus or bending stress by summing the full continuous cross-section, ignoring the effective breadth of attached plating and the buckling of compression flanges, and they do not check whether the neutral axis is measured from the baseline or the keel.
Textbook beam theory is taught with solid sections, while classification rules use effective breadth and buckling checks; candidates transfer the simple formula directly and lose marks on the assumptions.
What to do instead
Practise worked examples that state effective breadth for longitudinals, apply the hull girder bending stress formula with the section modulus taken about the neutral axis, and always add a sentence on compression-flange buckling and the position of the neutral axis.
In damage stability problems, candidates apply the intact stability criteria (such as the area under the GZ curve to 30 or 40 degrees) to the damaged condition instead of the probabilistic or deterministic damage stability requirements, and they forget to account for the free surface of floodwater in the damaged compartment.
Intact stability is drilled heavily in preparation, while subdivision and damage stability are seen as a separate topic; candidates default to the familiar criteria and omit permeability and floodwater free-surface effects.
What to do instead
Work through a deterministic damage case end to end: identify the compartment, apply the permeability, compute the lost buoyancy or added weight, correct GM for floodwater free surface, and then check the actual damage stability criteria (residual freeboard, range, angle of equilibrium) rather than intact criteria.
Candidates state that a load line assignment is simply a matter of measuring freeboard from the deck line and mark the load line disc without verifying the conditions of assignment, such as hatch coaming height, closing appliances, guard rails, and freeing ports.
The load line marks are visually memorable and dominate revision, so candidates treat the assignment as a marking exercise and overlook that the freeboard is conditional on the conditions of assignment being met.
What to do instead
For each load line question, list the conditions of assignment that must be verified before the freeboard is granted, and state that the surveyor must confirm them at assignment and at each annual survey; include the tabular freeboard correction for block coefficient and depth in the answer.
When asked about propulsion or auxiliary machinery surveys, candidates describe only the running trial and omit the internal examination, the opening-up of the machinery, the crankshaft deflection or bearing clearance measurements, and the verification of safety devices such as overspeed trips and relief valves.
Machinery is often revised from general engineering principles rather than from survey checklists, so candidates answer as if the question were about how the engine works rather than what the surveyor examines and records.
What to do instead
Prepare a survey checklist per machinery item (main engine, auxiliary engine, boiler, steering gear, shafting) covering documentation review, external examination, internal examination, measurements with acceptance criteria, safety device testing, and the report entry; practise answering in that order.
Candidates treat automation and control system surveys as an electrical continuity check and fail to verify fail-safe behaviour, alarm and trip set points, independence of redundant channels, and the testing of the safety system against the cause-and-effect matrix.
Control systems are abstract and candidates lack hands-on familiarity, so they fall back on generic electrical inspection language and miss the functional safety logic that the survey is actually about.
What to do instead
Learn to read a cause-and-effect matrix and practise describing how each input is simulated, how the output is verified, and how fail-safe and redundancy are demonstrated; always state that set points are compared with the approved documentation and that the test result is recorded.
In fire protection and life-saving appliance questions, candidates list the equipment required but do not link it to the ship type, the space category, the fire risk, or the required maintenance and inspection intervals, and they confuse the requirements for new ships with those for existing ships.
Equipment lists are easy to memorise, while the SOLAS chapter II-2 tables and the LSA maintenance schedules are complex; candidates avoid the tables and give a generic list.
What to do instead
Practise reading the fire safety systems tables by space category and ship type, and build a maintenance schedule for each LSA item (lifeboat, davit, release gear, immersion suit, extinguisher) with the interval, the responsible person, and the record required; state the ship's construction date before applying the requirement.
Candidates describe a survey as a single attendance and do not distinguish the initial, annual, intermediate, special, and occasional surveys, nor do they state the scope, the documentation to be reviewed, the items to be examined, and the conditions for maintaining the class or certificate.
Survey procedures are learned as a list of names rather than as a sequence of scopes, so candidates cannot map a scenario to the correct survey type or explain what happens if a survey is not completed within the window.
What to do instead
Build a table with one row per survey type and columns for timing window, scope, documentation, examination items, and consequence of non-completion; practise classifying scenarios into the correct survey type and stating the window and the extension or postponement rules.
When discussing welding and non-destructive testing, candidates recommend a test method without stating the defect type it detects, the acceptance standard and acceptance criteria, the extent of testing, and the qualification of the personnel and the procedure.
NDT methods are taught as separate techniques, and candidates memorise what each method does without linking it to the defect, the standard, and the qualification requirements that make the result valid.
What to do instead
For each method (radiographic, ultrasonic, magnetic particle, dye penetrant, visual), write what defect it detects, its limitations, the applicable standard and acceptance level, the required personnel certification, and the procedure qualification; in answers, always state the acceptance criteria and who is qualified to apply them.
In ethics and conduct scenarios, candidates state that the surveyor should 'act professionally' or 'follow the rules' without identifying the specific conflict of interest, the applicable code of ethics clause, the disclosure and recusal steps, and the reporting obligation to the flag State or class society.
Ethics is revised as general principles rather than as a decision procedure, so candidates give abstract answers that do not demonstrate the concrete steps a surveyor must take when pressured or when a defect is found.
What to do instead
Practise a fixed answer structure for ethics scenarios: identify the pressure or conflict, cite the relevant conduct requirement (independence, integrity, confidentiality, competence), state the immediate action (do not certify, record the finding), state the disclosure and recusal step, and state the escalation to the responsible authority with the written record.