Question 1

During your watch in the English Channel, the steering gear fails and the vessel takes a sudden sheer to starboard. Describe your immediate actions and the emergency steering procedure.

Accepted Answer

Immediate: sound the alarm; reduce speed to minimum steerage way; transmit urgent safety message on Ch 16 (PAN-PAN — vessel with steering failure in the English Channel); display NUC lights/shapes. Emergency steering: switch to alternative steering mode (autopilot to hand, or transfer to emergency steering position aft); engage emergency steering from the steering gear room (a crew member stationed there takes helm orders via sound-powered telephone or radio); inform master, engine room. Check: is the rudder responding? Is the failure mechanical (hydraulic burst) or electrical? SOLAS III Reg 19 requires steering gear emergency drills within 3 days of departure and at least every 3 months. SOLAS V Reg 26 (Steering gear — testing and drills): testing of emergency steering required within 12 hours before departure for vessels on international voyages; drills at least every 3 months. SOLAS II-1/29 (Steering gear requirements): cargo ships over 10,000 GT must have two independent power steering systems; steering gear must be capable of putting rudder from 35 degrees one side to 30 degrees other side within 28 seconds at maximum service speed. Emergency steering at the steering gear room (aft steering) is a core STCW competency — the OOW must know the procedure and be able to communicate with the aft station by sound-powered telephone. COLREGs Rule 18: a vessel restricted in her ability to manoeuvre (including loss of steering) is NUC. NUC signals must be displayed immediately. The PAN-PAN call on Ch 16 warns other vessels — in the congested Dover Strait, failure to warn other vessels of loss of steering has contributed to collisions.

Question 2

Your examiner asks: "Describe the fire triangle and the four internationally recognised classes of fire relevant to shipboard operations. Which extinguishing media are correct for each?"

Accepted Answer

The fire triangle requires three elements simultaneously: heat (ignition source), fuel (combustible material), and oxygen. Remove any one element and the fire goes out. Classes: Class A — solids (wood, rope, bedding) — water, foam, dry powder; Class B — flammable liquids (fuel oil, paint, solvents) — foam, CO2, dry powder; Class C — flammable gases (LPG, acetylene) — dry powder, shut off supply first; Class D — combustible metals (magnesium, titanium, sodium) — specialist dry powder only; Class F (electrical equipment) — CO2, dry powder — NEVER water. Note: electrical fires are sometimes classed separately rather than as a fire class. The fire triangle (heat, fuel, oxygen) underpins all firefighting strategy: cooling removes heat (water); smothering removes oxygen (CO2, foam blanket); starvation removes fuel (shut off supply, remove combustible material). Note the tetrahedron model adds a fourth element — the chain reaction — which halite extinguishing agents (Halon, now banned under MARPOL Annex VI except for existing systems) interrupt. Electrical fires (Class F in some classifications) must never be fought with water or foam — both conduct electricity. CO2 is the correct agent for switchboard and electrical equipment fires. Class D fires (metals) react violently with water — specialist dry powder (not standard ABC powder) is the only safe option. At OOW level, the examiner expects correct extinguishing media for each class and awareness that using the wrong agent can be dangerous.

Question 3

Your examiner asks: "What types of fire detectors are fitted on cargo ships under SOLAS Chapter II-2, and what are the conditions under which each type is most effective?"

Accepted Answer

Smoke detectors (ionisation or photoelectric): detect combustion particles — most effective for smouldering fires producing visible or invisible smoke before open flame. Heat detectors: either fixed-temperature (alarm at a set temperature, e.g. 57-96 degrees) or rate-of-rise (alarm when temperature rises faster than normal, e.g. 5 degrees per minute) — effective for fast-burning fires. Flame detectors: detect infrared or ultraviolet radiation from open flames — effective in machinery spaces with high background heat. Gas/carbon monoxide detectors: detect CO as an early indicator of smouldering fires. SOLAS II-2/7 requires automatic fire detection and alarm systems in crew accommodation, service spaces, control stations, and cargo spaces as appropriate. SOLAS II-2 Chapter 7 and the FSS Code Chapter 9 govern fire detection requirements. Key point for OOW orals: smoke detectors are the most sensitive for early detection of smouldering fires (which produce CO and aerosols before visible flames) — they are required in accommodation spaces. Heat detectors are more appropriate in galleys and machinery spaces where ambient temperatures and aerosols (cooking fumes, diesel exhaust) would cause false alarms from smoke detectors. Rate-of-rise detectors are faster-responding than fixed-temperature but can false-alarm in areas with rapid legitimate temperature changes (boiler rooms, hot work areas). Flame detectors are specifically required in unmanned machinery spaces. CO detectors as an early warning layer are increasingly specified in cargo hold monitoring systems. The FSS Code divides spaces into three categories: A (accommodation), B (service/machinery), and C (cargo) — each has specific detection requirements.