The Third Engineer is directly responsible to the Chief Engineer in the discharge of his duties. Whilst engaged on watchkeeping duties, he is responsible for the operation of all machinery, pumps, valves and systems controlled from the Engine Room.

He must be familiar with all control piping systems, valves, electrical and hydraulic systems so that in an emergency, essential services can be quickly and safely restored. Moreover, he ensures that the work environment is safe and must be fully conversant with the methods of use of all safety equipment and emergency procedures. He assists the ship’s Safety Officer in the promotion of safety throughout the engineer function. He is also responsible for preparing the main and auxiliary machinery for the forthcoming voyage, testing all necessary equipment alarms and shutdowns as instructed.