Question 1

A maintenance checklist requires the second engineer to consult the vessel's fuel piping drawings and identify every valve or circuit needing isolation. He marks the item complete. What does NTSB's investigation suggest about relying on this checklist alone?

Accepted Answer

A completed checklist item only proves a box was ticked — the fire showed the drawing review likely didn't happen in enough depth to catch the backflow path NTSB concluded it was unlikely the drawings were carefully reviewed, since a real review would have shown the clear backflow path from the day tank to the disconnected return line. A completed checklist measures that a step was gone through, not that it achieved its purpose.

Question 2

You're draining a thermal oil system that was running normally a short time ago. Before opening the drain point, what should you confirm?

Accepted Answer

That the system has cooled and depressurised, and you are positioned clear of the drain point's discharge path On the dredger MV Amazone, two crew members draining a thermal oil system after months of contamination were sprayed with hot oil, suffering severe burns. The investigation found company procedures lacked clear instructions for safe drainage — confirming the system has cooled and depressurised, and standing clear of the discharge path, are essential before opening any drain point on a hot oil system.

Question 3

A thermal oil system has been contaminated and needs draining for cleaning. The written procedure tells you to open the drain valve but doesn't specify a cooling-down period or PPE. What should you do?

Accepted Answer

Treat the gap as a hazard in its own right: apply a suitable cooling/depressurising period and full PPE before proceeding, and raise the procedure gap with the Chief Engineer The FEBIMA investigation into the MV Amazone incident found that although the crew followed company procedures, those procedures lacked clear instructions for safely draining a thermal oil system. A procedure that's silent on cooling time and PPE for a hazardous task is a gap to be closed before the job starts — not a green light to skip those precautions.