The second engineer — "second" in the engine room — runs the engine department day to day and is the chief engineer's deputy. If the chief engineer decides what the plant needs, the second engineer makes it happen: the day's jobs, the big overhauls, the engine crew and the main engine itself. It is also the rank from which chief engineers are made. This guide covers the duties, a typical day, the certificate, the interview and the step up.
What the second engineer does
- Organises the engine room. Plans the day's work for the third and fourth engineers, fitters, oilers and wipers, and checks it is done right and safely.
- The main engine. On most ships the main engine and its systems are the second engineer's responsibility: overhauls of pistons, liners, injectors and exhaust valves, performance readings, and the planned maintenance records.
- Planned maintenance system. Keeps the jobs on schedule, records the running hours, and orders the spares the next overhauls will need.
- Watchkeeping or duty. On ships with a manned engine room the second engineer often keeps the 04:00–08:00 and 16:00–20:00 watch; on ships with an unattended machinery space (UMS) the engineers work by day and take turns as duty engineer at night.
- Bunkering. Often runs the bunkering operation under the chief engineer: tanks, soundings, sampling and the oil record book.
- Safety. Permits for hot work and enclosed spaces in the engine room, the engine team's roles in drills, and the condition of the fire-fighting equipment below.
- Deputy. Takes over if the chief engineer cannot act.
A typical day
- 07:30–08:00: the plan with the chief engineer, then a toolbox talk with the engine crew.
- 08:00–17:00: maintenance — usually the second engineer is in the middle of the biggest job of the day.
- Evening: records, spare-part lists, the plan for tomorrow; on UMS ships, the duty engineer round before the engine room is left unattended.
Manoeuvres, bunkering and breakdowns come at any hour, and the second engineer is usually the first person the chief engineer calls.
Differences by vessel type
- Container ships: large two-stroke engines, high loads and short port stays — overhauls have to fit into tight windows.
- Tankers: cargo pumps, boilers and inert gas plants on top of the main engine.
- Gas carriers: dual-fuel engines or steam plants, gas handling systems, high voltage.
- Bulk carriers: simpler plants and long voyages; time for maintenance, but fewer spares.
- Offshore: diesel-electric plants, thrusters and DP redundancy; often a DP-related induction.
Certificates and documents
- Certificate of competency, second engineer (STCW III/2, 3,000 kW or more) — revalidated every five years; for 750–3,000 kW, III/3.
- Flag endorsements (STCW I/10).
- Medical certificate — valid for at most two years.
- Basic Training refreshers every five years; Advanced Fire Fighting, Medical First Aid, PSCRB.
- ERM, High Voltage (management level on many ships), type-specific courses for electronically controlled engines.
- For tankers and gas carriers — the cargo courses; for gas-fuelled ships — IGF.
What it takes
Under STCW Regulation III/2, the second engineer's certificate for ships of 3,000 kW or more requires the officer-of-the-watch certificate (III/1) and at least 12 months of approved sea service as assistant engineer officer or engineer officer — in practice, time as third engineer. Your administration's exams and the management-level courses come on top.
The path
Fourth engineer → third engineer → second engineer → chief engineer. For the chief engineer's certificate STCW III/2 asks for at least 36 months of approved sea service, of which at least 12 months in a position of responsibility while qualified as second engineer.
Contracts and rotation
Second engineers usually sail four to six months. MLC 2006 limits the time on board before repatriation to less than 12 months; the rest-hour minimums — 10 hours in 24 and 77 in seven days — matter a lot for a rank that is always called first.
Interview questions for a second engineer
- "Describe the last main engine overhaul you led." Unit, findings, measurements, time taken.
- "How do you plan maintenance around port stays?"
- "Purifier not separating — what do you check?" Temperature, gravity disc, throughput, the bowl.
- "What are the signs of a scavenge fire, and what do you do?"
- "How do you organise a bunkering?" Tanks, soundings, samples, communication, spill prevention.
- "Blackout at sea — your actions?" Emergency generator, restoring power, finding the cause.
Common mistakes
- A CV without engine makes, models and power.
- Claiming main engine overhauls you only watched. Superintendents ask about clearances and measurements.
- Missing High Voltage when the ship has a high-voltage plant.
- Not showing leadership — a second engineer is judged on how the engine team works.
FAQ
How long from third to second engineer?
Usually one or two contracts as third engineer, once the second engineer's certificate is in hand.
Does the second engineer keep a watch?
On manned engine rooms often the 04–08 watch; on UMS ships engineers work days and take turns on duty.
What is the difference between second engineer and first engineer?
On some fleets the second engineer is called "first engineer" — it is the same rank.
Can I be a second engineer with a III/3 certificate?
Only on ships of 750–3,000 kW; larger ships need III/2.
Pay and jobs
A clear step up from third engineer, and close to chief officer level on many fleets. The current range from real vacancies is on the second engineer jobs page; a comparison by rank on our salaries page.
Your CV
Crewing desks look for engine makes and models, power, vessel types and the overhauls you led. The maritime CV lays them out where a superintendent looks first.
Requirements follow STCW and MLC 2006; your flag state may add its own. Check them with your maritime administration.