Second assistant engineer
（重定向自Third Engineer）
A Second Assistant Engineer or Third Engineer is a licensed member of the engineering department on a merchant vessel or naval vessel.
The Second Assistant is usually in charge of boilers, fuel, auxiliary engines, condensate and feed systems, and is the third most senior marine engineer on board. Depending on usage, "the Second" or "the Third" 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.