Working-ETO field notes.
Long-form technical articles written from the deckplate, not from a marketing desk. Diagnostics, class survey preparation, emergency dispatch playbooks, equivalent-part hunting. New article roughly once a month — bookmark and circulate to the engineers who need it.
- Power Systems
Insulation Resistance Trending on 440V Distribution: Reading the Slope, Not the Number
A single megohm reading tells you almost nothing on a 440V marine distribution system — the slope across the survey cycle is what predicts a flashover. How to build an IR trend that surveyors trust, what PI and DAR add on motors, and how to separate moisture from genuine insulation degradation with a Megger MIT525.
Jun 7, 202612 min read - Power Systems
Main Switchboard Blackout Recovery & PMS Load-Sharing: Why the Bus Will Not Stay Up
A blackout that recovers cleanly is a PMS doing its job; a blackout that keeps tripping the bus on restart is a load-sharing, sequencing or protection problem. How to diagnose dead-bus closing, sequential restart and kW/kVAR sharing on a diesel-electric main switchboard before it costs a port call.
Jun 7, 202613 min read - Automation & Control
Bow-Thruster & Pump VFD Commissioning Faults: When the Drive Was Never Set Up Right
Not every VFD fault is a worn part — on bow thrusters and cargo pumps the most stubborn faults trace back to commissioning: wrong motor model parameters, missing autotune, mis-set ramp times and unfiltered output cabling. How to find and fix the set-up faults on ABB ACS880, Vacon NXP and Danfoss VLT marine drives.
Jun 7, 202612 min read - Automation & Control
BWTS Electrical & Control Fault-Finding: Live Diagnostics Beyond the Survey Checklist
When a ballast water treatment system trips, alarms or refuses to run in service, the fault is usually electrical or control — not biological. How to diagnose UV reactor power faults, TRO sensor errors, filter differential-pressure trips and BWTS-to-IAS interface problems on Alfa Laval, Erma First and Techcross systems.
Jun 7, 202612 min read - Bridge & Navigation
Bridge ECDIS & GMDSS Power Supply Problems: The Faults Behind the Black Screens
An ECDIS that reboots on a heavy sea, a GMDSS console that drops to battery for no reason, a radar that browns out when the bow thruster starts — most bridge electronics failures are power-supply problems, not equipment failures. How to diagnose the 24V DC distribution, the UPS changeover and the dual-redundant feed on a commercial bridge.
Jun 7, 202612 min read - Supply & Sourcing
Obsolete Marine Part Cross-Referencing: How to Source What the Maker No Longer Sells
When the maker has discontinued the exact part — a relay, a PLC card, a contactor, an AVR board — the vessel does not have to wait for a redesign. How cross-referencing works, what makes an equivalent acceptable to class, and how to source a form-fit-function replacement for an obsolete marine electrical component.
Jun 7, 202611 min read - Compliance & Class
Special Survey Electrical Prep: 10-Point Walk-Through for Bulkers and Tankers
What the surveyor walks with on day one of a 5-year Special Survey — ACB primary injection, insulation resistance trends across the 440V distribution, bus-tie discrimination on paper, emergency switchboard blackout drill, and the class-template paperwork that closes the visit in days instead of weeks.
May 23, 202613 min read - Automation & Control
IACS UR E26 & E27 Marine Cyber Compliance: What ETOs Actually Check
The IACS Unified Requirements E26 (cyber resilience of ships) and E27 (cyber resilience of on-board systems) apply to vessels contracted after 1 January 2024 — and to most retrofits. The compliance checklist a working ETO runs on the engine-room network, IAS, BWTS controller and the navigation suite before the delivery surveyor boards.
May 23, 202612 min read - Power Systems
Lithium Hybrid BMS for Vessels: Commissioning Checks, Class Acceptance, Failure Modes
A working-ETO walk-through of marine lithium energy-storage commissioning — CAN bus termination, thermal-runaway interlocks, cell imbalance under regen, class acceptance under DNV B-100 and ABS Guide for ESS, and the failure modes that catch crews who treat the system like a bigger lead-acid bank.
May 23, 202612 min read - Power Systems
Cold Ironing Pre-Connection Checklist: 9-Point Walk-Through for US Berths
What the duty engineer checks before plugging into shore power at a CARB or IEC/IEEE 80005-1 berth — phase rotation, isolation transformer scheme, earth-fault monitor disagreement and bus synchronisation across US East Coast, Gulf and West Coast ports.
May 23, 202611 min read - Bridge & Navigation
GMDSS Annual Radio Survey: 6-Hour Battery Discharge Test Walk-Through
How a working ETO actually runs the GMDSS reserve battery 6-hour discharge test, what the surveyor will check on VHF/MF/HF DSC and INMARSAT, and the EPIRB hydrostatic release records they expect.
May 23, 20269 min read - Automation & Control
Marine VFD Trip Codes Decoded: F0001, F0007 and the Real Root Causes
ABB ACS880, Siemens Sinamics and Yaskawa marine VFD trip codes — what F0001 overcurrent and F0007 overvoltage actually mean on bow thruster, cargo pump and engine-room fan drives, and the parameter changes that fix them for good.
May 23, 202610 min read - Bridge & Navigation
Furuno Radar Magnetron Replacement: Signs, Swap, and Class Verification
When to change a Furuno MG5436 or MG5223F magnetron, how the swap actually runs on the bridge, and the performance monitor numbers the PSC inspector will want to see afterwards.
May 23, 20269 min read - Safety & Compliance
Marine Fire Detection False Alarms — 8-Step Root-Cause Hunt
Eight diagnostic steps an ETO walks before raising a deficiency or replacing the panel, covering Autronica BS-100, Consilium Salwico CS3000, and Notifier marine loops.
May 23, 202610 min read - Automation & Control
Engine Room PLC Card Replacement — Kongsberg K-Chief Walk-through
How an ETO actually swaps a faulty Kongsberg K-Chief 700 or 600 module live, what to back up first, and the verification routine the chief engineer signs off.
May 23, 202611 min read - Compliance & Class
BWTS Troubleshooting: 10-Point Checklist Before Class Survey
A ten-step BWTS pre-survey checklist used by working ETOs to clear UV, electrochlorination and filter-stage faults before the class surveyor steps onboard.
May 20, 202612 min read - Power Systems
Why Your AVR Keeps Failing — Diagnostic Walkthrough
A working ETO's diagnostic walkthrough for repeating AVR faults on shipboard diesel generators: hunting at light load, kVAR imbalance, sensing CT errors and PCB capacitor drift.
May 19, 202614 min read - Emergency Response
AOG (Aircraft on Ground) Equivalent for Vessels: 6-Hour Service Plan
What 'AOG' looks like at sea: a six-hour service plan for vessels with a broken-down electrical system in port, structured around the four levers — diagnose remotely, ship the part, dispatch the engineer, paper the class.
May 18, 202611 min read
Need this fixed, not just explained?
Every article above is grounded in a real attendance. If the symptom on the article matches the symptom on your vessel, the wizard puts an engineer on it before the next watch change.