Entry & progression
Third Assistant → Second Assistant → First Assistant → Chief Engineer. Four grades. No tonnage limit on any of them. Exactly two examinations on the whole climb. This lesson sets the frame before we start counting months.
The top of the American engineering ladder is four grades deep. In order: Third Assistant Engineer, Second Assistant Engineer, First Assistant Engineer, Chief Engineer. They sit in 46 CFR Part 11 Subpart E, and they are the same four grades whether you run the plant on a tanker, a tug, a containership or a 90-metre yacht.
There is no yacht grade. There never was.
Section 11.501 lists thirteen national engineer grades and it is a closed list. It makes special provision for fishing vessels, for MODUs and for OSVs. It makes none for yachts. A yacht engineer on a US-flagged vessel therefore holds the ordinary commercial engineering credential — the identical ticket held by the engineer on a chemical tanker. That is not a gap to be lamented. It is the ladder, and it is the right one to learn.
The thing everybody gets wrong: tonnage
On the deck side, everything is scoped by gross tonnage. Engineering is scoped by propulsion power. But do not over-correct and announce that tonnage never touches engineers — it caps the rungs below this course:
| Grade | Tonnage limit |
|---|---|
| Chief / 1st / 2nd / 3rd Assistant Engineer | None. No tonnage limit whatsoever. |
| Chief Engineer-Limited, Assistant Engineer-Limited | Unlimited inland; < 1,600 GRT ocean / near-coastal / Great Lakes (11.501(b)) |
| Designated Duty Engineer — all three tiers | < 500 GRT (11.501(c), 11.524(a)) |
Read that first row again. Once you hold Third Assistant Engineer, the size of the ship stops being a question. The only ceiling left is horsepower — and horsepower is not a grade you apply for. It is a number the Coast Guard calculates from your service.
The horsepower limitation is a formula, not a credential
Under 46 CFR 11.503(b) the Coast Guard computes a propulsion-power limitation from the vessels you actually served on. If the calculation lands at or above 10,000 HP / 7,500 kW, an unlimited propulsion-power endorsement is issued. "Unlimited" is the outcome of a sum. There is no separate unlimited ticket to sit for. Lesson 1.3 works the arithmetic in full — it is the single most consequential piece of maths in this course.
WARNING — You do NOT test at every rung On the unlimited ladder you sit exactly two professional examinations: Third Assistant Engineer (operational level, 11.903(a)(31)) and First Assistant Engineer (management level, 11.903(a)(30)).
There is no examination for Second Assistant Engineer (11.903(c)(9)) and no examination for Chief Engineer (11.903(c)(6)). Those two rungs are earned with sea service and nothing else. Anyone who tells you the climb is a stack of exams has not read the regulation.
Two gates before any of this matters
- Citizenship — 11.201(d): "No officer endorsement may be issued to any person who is not a citizen of the United States." The only carve-out in the section is a deck ticket. A non-US citizen cannot obtain any USCG engineer officer endorsement. For most yacht crew this is where the conversation ends, and it is kinder to say so on page one.
- Age — 11.201(e): 19 for Third Assistant Engineer. 21 for everything above it.
The name of the top grade is worth getting right too. Section 11.501(a)(1) calls it simply "Chief Engineer." The CFR contradicts itself elsewhere — 11.903(c)(6) writes "Chief Engineer-Unlimited" — so the safest published form is Chief Engineer (unlimited horsepower). Unlimited describes the absence of a limitation. It is not part of the name.