Question 1

The autopilot loses rudder angle feedback due to a fault in a small mechanical linkage arm on the rudder angle sensor. Why did this disable both the autopilot AND the follow-up manual steering mode, rather than just the autopilot?

Accepted Answer

Both the autopilot and follow-up manual steering rely on the same rudder angle feedback signal to know the rudder's actual position — losing that signal disables both modes, leaving only non-follow-up (direct) steering unaffected Follow-up steering modes (including autopilot) depend on knowing the rudder's actual angle to correctly position it relative to a commanded angle. When the linkage arm on the rudder angle sensor worked loose, that feedback was lost, disabling both modes that depend on it. Only non-follow-up (direct, toggle) steering — which doesn't rely on rudder angle feedback — remained usable. Knowing which steering modes share a single point of failure is critical for a fast, correct response.

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.