|Other names||Second assistant engineer|
|Reports to||Chief engineer, second engineer|
|Duties||daily maintenance and operation in the engine department|
|Requirements||Sea Time on Previous License, Professional Training.|
|Watchstander||Depends on manned/unmanned engine room|
|Watch (at sea)||Varies (0000-0400, 1200-1600)|
|Watch (in port)||Varies (0000-0800)|
The third engineer is usually in charge of boilers, fuel, auxiliary engines, condensate and feed systems, and is the third most senior engine officer on board. Depending on usage, "the Third" or "the Second" is also typically in charge of fueling (a.k.a. bunkering), granted the officer holds a valid Person In Charge (PIC) endorsement for fuel transfer operations.
The exact duties of this position will often depend upon the type of ship and arrangement of the engine department. On ships with steam propulsion plants the Second/Third is in charge of the boilers, combustion control, soot blowers, condensate and feed equipment, feed pumps, fuel, and condensers. On diesel and gas turbine propulsion plants the Second is in charge of auxiliary boilers, auxiliary engines, incinerator, air compressors, fuel, and fuel oil purifiers.
International Maritime Organization (1995) . "III: Standards Regarding the Engine Department". International Convention on Standards of Training, Certification and Watchkeeping for Seafarers, 1978. Section A–III/1.