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Back to ChaptersChapter 10

Machinery

Main engine, auxiliary systems, maintenance — 30 questions

MC-01

Walk me through your planned maintenance system and show me whether any critical machinery jobs are currently overdue, and if so, what's being done about it.

What the inspector looks for
Objective

Planned Maintenance, Class Status & Critical Spares — Overdue critical PMS jobs

What the Inspector Expects
  • Establishes the vessel operates a structured PMS covering all machinery affecting safety and pollution prevention, per ISM Code Section 10
  • Confirms overdue jobs are visible/flagged in the system rather than silently rolled over, particularly items classed 'critical'
  • Checks whether overdue critical jobs have triggered escalation to the technical superintendent per the SMS
  • Verifies the PMS distinguishes critical safety/pollution equipment from routine maintenance so overdue critical items stand out
  • Chief Engineer2nd EngineerMaster
    MC-02

    Can you show me the current status of your class survey machinery items -- what's due, what's overdue, and how you're tracking the Continuous Machinery Survey items if you're enrolled in one?

    What the inspector looks for
    Objective

    Planned Maintenance, Class Status & Critical Spares — Class survey machinery status

    MC-03

    When a planned maintenance job has to be deferred past its due date, what's the process for approving that, and can you show me the risk assessment behind a recent deferral?

    What the inspector looks for
    Objective

    Planned Maintenance, Class Status & Critical Spares — Maintenance deferral risk assessment

    MC-04

    How does the vessel identify which machinery items are 'critical equipment,' and can you show me the minimum spare parts holding against that list?

    What the inspector looks for
    Objective

    Planned Maintenance, Class Status & Critical Spares — Critical equipment & spares

    MC-05

    After a major overhaul or repair on a piece of critical machinery, how do you prove it's actually fit to return to service before it's put back online?

    What the inspector looks for
    Objective

    Planned Maintenance, Class Status & Critical Spares — Post-maintenance function tests

    MC-06

    Can you show me the main engine's current performance data and how it compares against the original shop test or sea trial figures?

    What the inspector looks for
    Objective

    Main Engine Condition & Combustion — ME performance vs shop test

    MC-07

    Walk me through the exhaust gas temperature spread across the main engine units right now, and how you'd respond if one unit started running noticeably hotter than the rest.

    What the inspector looks for
    Objective

    Main Engine Condition & Combustion — Unit exhaust temp spread

    MC-08

    What records prove the fuel injectors and fuel pumps are being overhauled and calibrated at the intervals the manufacturer specifies?

    What the inspector looks for
    Objective

    Main Engine Condition & Combustion — Fuel injection maintenance

    MC-09

    How often is the crankcase oil mist detection and alarm system function-tested, and can you show me the last test record?

    What the inspector looks for
    Objective

    Main Engine Condition & Combustion — Oil mist detector tested

    MC-10

    Walk me through your scavenge space inspection routine and the precautions taken to prevent a scavenge fire.

    What the inspector looks for
    Objective

    Main Engine Condition & Combustion — Scavenge space fire precautions

    MC-11

    How is the cylinder lubrication feed rate determined and controlled for the main engine, and how do you know it's actually being delivered at the set rate?

    What the inspector looks for
    Objective

    Turbocharger, Cylinder Lubrication, Governor & Manoeuvring — Cylinder LO feed rate control

    MC-12

    What's the condition of the turbochargers, and has this engine had any history of surging -- if so, how was it investigated and resolved?

    What the inspector looks for
    Objective

    Turbocharger, Cylinder Lubrication, Governor & Manoeuvring — Turbocharger condition & surging

    MC-13

    When was the main engine governor and the independent overspeed trip last tested, and can you show me the results?

    What the inspector looks for
    Objective

    Turbocharger, Cylinder Lubrication, Governor & Manoeuvring — Governor & overspeed tests

    MC-14

    Can the main engine actually be crash-stopped and run at dead-slow ahead/astern reliably, and when was this capability last proven rather than just assumed?

    What the inspector looks for
    Objective

    Turbocharger, Cylinder Lubrication, Governor & Manoeuvring — Crash stop / dead-slow capability

    MC-15

    Show me how you'd change engine control from the bridge to the engine control room, and then from the ECR to local manual control at the engine -- and how often is this actually practiced?

    What the inspector looks for
    Objective

    Turbocharger, Cylinder Lubrication, Governor & Manoeuvring — Bridge to ECR to local changeover

    MC-16

    Can you show me the record of the full steering gear test carried out within 12 hours before this departure, covering every item required by the checklist?

    What the inspector looks for
    Objective

    Steering Gear — Pre-departure steering gear test

    MC-17

    Walk me through your last emergency steering drill, operated directly from the steering gear compartment -- how was the bridge instructed and how long did it take?

    What the inspector looks for
    Objective

    Steering Gear — Emergency steering drill

    MC-18

    Are the steering gear changeover procedures -- from bridge control to manual, and from main to auxiliary/emergency steering -- actually posted where they're needed, and can the duty engineer talk me through them?

    What the inspector looks for
    Objective

    Steering Gear — Steering changeover procedures posted

    MC-19

    What's the hydraulic oil level in the steering gear system right now, and what reserve supply is available if you needed to top up during an emergency?

    What the inspector looks for
    Objective

    Steering Gear — Steering hydraulic oil reserve

    MC-20

    Show me your emergency generator test records -- the weekly no-load start and the monthly test under load with the emergency switchboard actually carrying the load.

    What the inspector looks for
    Objective

    Emergency Power, Starting Air, Fire Pump & UPS — Emergency generator start & load test

    MC-21

    If the ship suffered a total blackout right now, what would happen automatically, and can the duty engineer walk me through the full recovery procedure to restore main power and propulsion?

    What the inspector looks for
    Objective

    Emergency Power, Starting Air, Fire Pump & UPS — Blackout autostart & recovery

    MC-22

    What's the independent fuel supply for the emergency generator, what's the backup if the primary starting batteries fail, and how is the generator room kept within an operable temperature range?

    What the inspector looks for
    Objective

    Emergency Power, Starting Air, Fire Pump & UPS — Emergency generator support systems

    MC-23

    If both main air compressors were unavailable, how would you get enough starting air to restart the main engine, and is that emergency air compressor actually independent of the main electrical supply?

    What the inspector looks for
    Objective

    Emergency Power, Starting Air, Fire Pump & UPS — Emergency air compressor redundancy

    MC-24

    Can you demonstrate starting the emergency fire pump from its remote location, and show me it can actually draw suction and deliver the required pressure when the vessel is in ballast condition?

    What the inspector looks for
    Objective

    Emergency Power, Starting Air, Fire Pump & UPS — Emergency fire pump readiness

    MC-25

    How are the batteries and UPS units supporting essential navigation and safety equipment maintained, ventilated, and load-tested?

    What the inspector looks for
    Objective

    Emergency Power, Starting Air, Fire Pump & UPS — Batteries & UPS load test

    MC-26

    Walk me through how fuel viscosity is controlled at the engine, how a fuel changeover is carried out and documented, and what alarms exist to catch a high-pressure fuel line leak before it becomes a fire risk.

    What the inspector looks for
    Objective

    Fuel/Lube Oil Systems, Fluid Monitoring & Defect Control — Fuel oil system integrity

    MC-27

    What does your lube oil sampling and analysis programme actually cover -- main engine, generators, and steering gear -- and can you show me a recent report that triggered a maintenance action?

    What the inspector looks for
    Objective

    Fuel/Lube Oil Systems, Fluid Monitoring & Defect Control — Lube oil analysis programme

    MC-28

    How is the engine cooling water treated and tested, and what does the record show about corrosion inhibitor levels and pH over the recent past?

    What the inspector looks for
    Objective

    Fuel/Lube Oil Systems, Fluid Monitoring & Defect Control — Cooling water treatment & testing

    MC-29

    Beyond oil sampling, what condition-monitoring data do you collect -- vibration analysis on rotating machinery, stern tube lube oil consumption and aft seal condition, and propeller or hull performance trends -- and how does it feed into your maintenance planning?

    What the inspector looks for
    Objective

    Fuel/Lube Oil Systems, Fluid Monitoring & Defect Control — Condition-based monitoring programme

    MC-30

    How are machinery defects reported to class and the company, how do you control anything running on a temporary repair, and can you show me the quick-closing valves and remote emergency shutoffs actually being function-tested?

    What the inspector looks for
    Objective

    Fuel/Lube Oil Systems, Fluid Monitoring & Defect Control — Defect reporting & quick-closing valves

    Chapter 9Chapter 11
    What the Inspector Expects
  • Confirms the vessel's class certificate machinery items (annual, intermediate, special survey, or CMS cycle) are tracked with due dates
  • Establishes whether any machinery survey item is overdue and whether a class extension/dispensation has been formally granted
  • Checks the Chief Engineer can explain which items fall under the CMS programme and their individual due windows
  • Verifies survey status aligns with the classification society's official report, not just the crew's informal understanding
  • Chief EngineerMaster
    What the Inspector Expects
  • Establishes a documented deferral approval process exists rather than jobs being pushed back informally, per ISM Code Section 10 and 8
  • Confirms a specific risk assessment is completed for each deferral of a critical item, weighing consequence of failure against time to next opportunity
  • Checks the deferral has a defined new target date and is reviewed by the technical department ashore, not left open-ended
  • Verifies compensating measures (increased monitoring, reduced load, standby readiness) are identified when a critical job is deferred
  • Chief EngineerMaster
    What the Inspector Expects
  • Confirms the SMS maintains a defined critical equipment list (main engine, steering gear, emergency generator, etc.) per ISM Code Section 10.3
  • Establishes minimum spare parts are held onboard for each critical item per class/flag requirement and company policy, not just what's left over
  • Checks spares are stored, labelled, and readily locatable, in condition suitable for immediate use
  • Verifies a process exists to reorder consumed critical spares before stock falls below the defined minimum
  • Chief Engineer2nd Engineer
    What the Inspector Expects
  • Establishes a documented function/performance test is carried out after maintenance or repair before equipment is declared operational, per ISM Code Section 10
  • Confirms the test verifies the specific function affected by the work (e.g., safety trip after governor work, pressure test after a valve overhaul)
  • Checks records show who conducted and witnessed the test, and the acceptance criteria used
  • Verifies equipment is not left provisionally in service indefinitely without the test being closed out
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Establishes routine main engine performance recording (indicator diagrams or equivalent electronic monitoring, fuel index, scavenge and exhaust pressures) per manufacturer and SMS requirements
  • Confirms current readings are actually benchmarked against the shop test report or sea trial baseline, not just recorded in isolation
  • Checks for a trending process that would flag gradual degradation in power balance or specific fuel consumption
  • Verifies deviations from baseline are investigated and linked to corrective maintenance
  • Chief Engineer2nd Engineer
    What the Inspector Expects
  • Confirms exhaust temperatures are logged unit-by-unit at a defined interval and the spread between highest and lowest unit is actively monitored, not just each value in isolation
  • Establishes the crew knows the manufacturer's acceptable temperature spread and load correction factors
  • Checks the response procedure when a unit deviates (fuel injector check, timing check, compression check) rather than simply noting it
  • Verifies findings are cross-referenced with combustion pressure (Pmax/Pcomp) data where fitted
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Establishes fuel injection equipment overhaul intervals follow the engine manufacturer's recommendation (running hours or calendar-based) unless a condition-based extension is justified
  • Confirms overhaul records capture nozzle condition, opening pressure, spray pattern check, and replacement of wear parts
  • Checks that injectors are tracked individually by unit/serial number so overhaul history for a specific unit can be traced
  • Verifies any condition-based interval extension is supported by performance/combustion data, not just convenience
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms the main engine, where bore/power meets the applicable threshold, is fitted with a crankcase oil mist detector or equivalent bearing temperature monitoring, per SOLAS machinery safety requirements and class rules
  • Establishes the detector and its alarm are function-tested at a defined interval, not left running unverified
  • Checks crew understand the alarm/shutdown response sequence, including not opening crankcase doors immediately, as required by crankcase explosion precautions
  • Verifies detector sensor heads are cleaned/serviced per manufacturer schedule since fouled sensors give false confidence
  • Chief Engineer2nd Engineer
    What the Inspector Expects
  • Establishes scavenge spaces are inspected at the PMS-defined interval for oil accumulation, deposits, and drain condition, a known precursor to scavenge fires
  • Confirms cylinder lubrication feed rate is set correctly, neither excessive nor insufficient, as part of fire prevention
  • Checks scavenge drain valves/piping are kept clear and monitored, with any temperature rise trend investigated promptly
  • Verifies crew know the emergency response to a scavenge fire before it develops into a crankcase incident
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms the cylinder oil feed rate is set per the manufacturer's guidance, often linked to fuel sulphur content and engine load, and reviewed when fuel changes
  • Establishes the electronic lubricator, where fitted, is monitored for actual delivery versus set point, with alarms for lubricator failure
  • Checks feed rate adjustments are logged with reasoning such as running-in, fuel change, or liner wear trend
  • Verifies cylinder oil consumption is trended and abnormal consumption investigated as an early liner/ring wear indicator
  • Chief Engineer2nd Engineer
    What the Inspector Expects
  • Establishes turbocharger cleaning of turbine and compressor sides, bearing condition, and overhaul history are tracked per PMS/manufacturer interval
  • Confirms any surging event is logged as an abnormal occurrence, not dismissed, given surging can indicate fouling, damaged blades, or exhaust/air system faults
  • Checks root cause analysis was carried out for any recorded surging incident and corrective action closed out
  • Verifies turbocharger speed, exhaust temperature, and boost pressure are monitored for early fouling detection
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms the governor and the separate, independent overspeed protection device are tested at the PMS/class-required interval, recognizing they must be functionally distinct systems
  • Establishes the overspeed trip setpoint matches the manufacturer's specified value and that the test actually proves the trip functions, not just a simulated signal
  • Checks governor tuning/response is verified during manoeuvring trials, not assumed adequate
  • Verifies test records distinguish the governor function test from the overspeed trip test, since conflating the two is a common gap
  • Chief Engineer2nd Engineer
    What the Inspector Expects
  • Establishes the engine's manoeuvring characteristics, including minimum stable RPM, time to reverse from full ahead, and crash-stop capability, are known and periodically verified
  • Confirms dead-slow ahead/astern is achievable without stalling or excessive vibration, since some engines struggle at very low load
  • Checks a recent full-astern/crash-stop manoeuvre is on record with observed results
  • Verifies engine room and bridge teams both understand the manoeuvre limitations, such as minimum time between astern orders to avoid engine damage
  • MasterChief OfficerChief Engineer
    What the Inspector Expects
  • Confirms the vessel can transfer propulsion control between bridge, ECR, and local emergency manual control positions per SOLAS requirements for communication and control of propulsion machinery
  • Establishes the changeover sequence is understood by watchkeepers at all three positions, including who holds command authority during transfer
  • Checks the changeover is drilled periodically, not just theoretically available, so it works reliably during an actual ECR evacuation or control failure
  • Verifies alarms/indications correctly show which station currently has control, preventing conflicting inputs
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms the full steering gear test is conducted within 12 hours before departure per SOLAS Ch. V Reg 26, covering main and auxiliary steering gear, remote control systems, and emergency steering
  • Establishes the test includes checking communication between bridge and steering gear compartment, rudder angle indicator accuracy, and autopilot-to-hand-steering changeover
  • Checks the test also confirms alarms for steering gear power failure/phase failure operate correctly
  • Verifies the test record is properly logged with time, date, and the officer who conducted it, not simply ticked as routine
  • MasterChief OfficerChief Engineer
    What the Inspector Expects
  • Confirms emergency steering drills, involving direct control from the steering gear compartment, are conducted at intervals not exceeding 3 months per SOLAS Ch. V Reg 26
  • Establishes the drill exercises the actual communication method between bridge and steering flat, including any backup method if the primary fails
  • Checks personnel assigned to the steering flat can operate the gear without reference to bridge visual cues, simulating a genuine loss of remote control
  • Verifies drill records note the time taken to establish local control and any deficiencies found
  • MasterChief OfficerChief Engineer
    What the Inspector Expects
  • Confirms simplified operating instructions with the necessary diagrams are displayed on the bridge and in the steering gear compartment, per SOLAS steering gear operating instruction requirements
  • Establishes the posted procedure matches the actual equipment fitted, with correct valve/switch labelling for that specific steering gear model
  • Checks the duty engineer or officer can explain the changeover sequence without needing to consult the poster from scratch, indicating real familiarity
  • Verifies changeover valves/switches referenced in the posted procedure are correctly labelled onboard and accessible
  • MasterChief OfficerChief Engineer
    What the Inspector Expects
  • Confirms steering gear hydraulic oil level is checked routinely and any low-level trend investigated for a developing leak
  • Establishes a defined reserve tank quantity is maintained onboard to allow topping up without immediately losing steering capability
  • Checks low-level and low-pressure alarms for the hydraulic system are tested and functioning
  • Verifies any history of hydraulic leakage has been investigated and repaired rather than routinely topped up without explanation
  • Chief Engineer2nd Engineer
    What the Inspector Expects
  • Confirms the emergency generator is started and run weekly, and additionally tested under load at least monthly, transferring the emergency switchboard load in a manner simulating actual failure of the main supply
  • Establishes test records capture starting time, run duration, and any abnormality such as smoke, vibration, or alarm noted
  • Checks the monthly load test genuinely exercises breakers and load transfer, not just a no-load run logged as if it were a load test
  • Verifies fuel, coolant, and lube oil levels are checked as part of each test, not only when a fault appears
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms the emergency generator is designed and tested to start and pick up automatically on loss of main power within the required time
  • Establishes the blackout recovery procedure, covering restoring main generators, restarting essential auxiliaries, and resuming propulsion, is documented and understood, not improvised
  • Checks the duty engineer can describe the sequence in their own words, including which loads are automatically shed and which must be manually restored
  • Verifies blackout drills are actually conducted periodically, with lessons learned incorporated into the procedure
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms the emergency generator has a dedicated fuel supply/day tank with capacity sufficient for the required endurance period, independent of the main fuel system
  • Establishes redundant starting arrangements exist, such as dedicated batteries or a hydraulic/air starting system independent of the main source, so a single failure doesn't prevent starting
  • Checks the emergency generator room has adequate heating/ventilation to keep the space and battery/equipment within operable limits in cold or hot climates
  • Verifies fuel quantity, battery condition, and room environmental conditions are checked as part of the routine inspection, not left unmonitored between tests
  • Chief Engineer2nd EngineerETO
    What the Inspector Expects
  • Confirms an emergency air compressor, or equivalent independent means, is provided to restore starting air without relying on the main power source
  • Establishes the emergency compressor's capacity is sufficient to build enough pressure for the required number of main engine starts
  • Checks the compressor is tested periodically and its independence, meaning a dedicated power source separate from the main switchboard, is verified rather than assumed
  • Verifies starting air receiver capacity and automatic drain arrangements support this redundancy in practice
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms the emergency fire pump meets its required capacity and pressure at the two most remote hydrants simultaneously
  • Establishes the pump's sea suction remains submerged and effective across the vessel's full range of operating draughts, including light ballast condition, a known failure point on some designs
  • Checks the pump can be started both locally and from the remote start position outside the machinery space, as required for scenarios where the machinery space itself is inaccessible
  • Verifies test records show actual pressure/flow readings, not just 'pump started' with no performance data
  • Chief Engineer2nd EngineerMaster
    What the Inspector Expects
  • Establishes batteries supporting essential services such as navigation lights, radio, alarm systems, and emergency lighting are maintained per manufacturer schedule
  • Confirms battery rooms/lockers are adequately ventilated to prevent hydrogen accumulation where applicable
  • Checks UPS units are periodically load-tested to confirm they can actually sustain the connected load for their rated duration, not just powered up and assumed healthy
  • Verifies a replacement/renewal schedule exists based on battery age and condition, rather than run-to-failure
  • Chief EngineerETO2nd Engineer
    What the Inspector Expects
  • Confirms fuel viscosity is automatically or manually controlled to the value the injection system requires, adjusted correctly as the fuel type changes
  • Establishes a written changeover procedure, for example HFO to low-sulphur/MGO for ECA entry or emergency, exists and is followed, with cooling-down time and viscosity managed to avoid injection pump seizure or fuel system shock
  • Checks double-wall or shielded high-pressure fuel lines have leak-off/drain detection with an alarm, and that this alarm is function-tested
  • Verifies fuel oil tank sounding/gauging arrangements, including remote gauges cross-checked against manual soundings, are accurate and regularly calibrated
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Confirms a regular lube oil sampling programme is in place covering main engine system oil, generator engine oil, and steering gear hydraulic/lube oil, with defined sampling intervals
  • Establishes samples are analyzed by a competent laboratory, or a reliable onboard test kit for basic parameters, for wear metals, water content, viscosity, and TBN/TAN as applicable
  • Checks results are trended over time, not viewed as one-off reports, so gradual degradation is caught early
  • Verifies an out-of-limit result actually triggers a defined corrective action rather than being filed without response
  • Chief Engineer2nd Engineer
    What the Inspector Expects
  • Establishes a defined cooling water treatment programme, covering corrosion inhibitor dosing and pH or equivalent chemical control, is followed for main engine and generator jacket water systems
  • Confirms testing is conducted at the manufacturer/chemical supplier's recommended interval, using a proper test kit, not estimated
  • Checks corrective dosing is applied and logged when test results fall outside the target range
  • Verifies the system is checked for chloride/salt contamination that would indicate a cooler leak, a common and damaging failure mode
  • Chief Engineer2nd Engineer3rd Engineer
    What the Inspector Expects
  • Establishes whether vibration analysis is used on major rotating machinery, such as the main engine, generators, and pumps, where fitted, and whether readings are trended against baseline
  • Confirms stern tube lubricating oil consumption is monitored and trended, since a rising consumption trend is the primary early indicator of aft seal wear or damage
  • Checks aft seal condition is assessed through both consumption trending and any available inspection opportunity such as dry-docking or ROV survey
  • Verifies propeller and hull performance, including speed/consumption trend and fouling indicators, are monitored to identify when cleaning or maintenance is needed
  • Chief Engineer2nd EngineerMaster
    What the Inspector Expects
  • Confirms a defined process exists for reporting machinery defects affecting class or statutory condition to the classification society and company technical department, per ISM Code Section 10
  • Establishes any temporary repair is tracked with a target date for permanent rectification and, where it affects a class item, has been accepted/recorded by the classification society
  • Checks fuel oil and lube oil tank quick-closing valves and other remote emergency shut-offs, such as ventilation fan stops and fuel quick-closing valves, are function-tested at the required interval, not merely inspected visually
  • Verifies the open list of outstanding defects is visible to the Master/Chief Engineer and reviewed periodically, not scattered across informal notes
  • Chief Engineer2nd EngineerMaster