The Chandris Substantial-Connection Test: Who Counts as a Jones Act Seaman

Almost everything in a maritime injury case turns on one threshold question: is the injured worker a seaman? A seaman sues under the Jones Act for an employer's negligence and under the general maritime law for unseaworthiness, with a jury and a full measure of damages. A worker who is not a seaman is usually confined to a workers'-compensation schedule. That is why the defense in so many cases spends its energy attacking seaman status — and why understanding the governing test matters so much.

The controlling framework comes from the Supreme Court's decision in Chandris, Inc. v. Latsis, 515 U.S. 347 (1995).

The two-part test

Under Chandris, a worker is a seaman only if both parts of a two-part test are met.

First — the duties prong. The worker's duties must contribute to the function of a vessel or to the accomplishment of its mission. The Supreme Court set a deliberately broad standard for this in McDermott International, Inc. v. Wilander, 498 U.S. 337 (1991): the worker need not aid in navigation or be a member of the traditional crew. It is enough that the worker does the ship's work. Cooks, engineers, mechanics, and many others clear this prong easily.

Second — the connection prong. The worker must have a connection to a vessel in navigation (or to an identifiable group of vessels under common ownership or control) that is substantial in terms of both its duration and its nature. This second prong is where most seaman-status fights are won or lost.

The 30% duration guideline

For the duration half of the connection prong, the Supreme Court in Chandris endorsed a rule of thumb the Fifth Circuit had developed: a worker who spends less than about thirty percent of his time in the service of a vessel should not ordinarily qualify as a seaman. The Court was explicit that this is a guideline, not a mechanical rule — it serves to separate sea-based maritime employees from land-based workers who have only a transitory or sporadic connection to a vessel.

The thirty-percent figure is a floor and a snapshot tool, not a ceiling. Courts look at the worker's overall employment, not a single day or assignment. A worker reassigned to a new vessel or a new role may have his status measured by the new assignment rather than his career-long average. The point of the inquiry is to capture the worker whose actual relationship to vessels is substantial.

The fleet (or "fleet-seaman") doctrine

A worker rarely spends his time on a single hull. The connection prong allows time to be aggregated across a group of vessels — but only where every vessel in the group is under the worker's employer's common ownership or control. The Fifth Circuit applied this in Roberts v. Cardinal Services, Inc., 266 F.3d 368 (5th Cir. 2001): time on commonly owned or controlled vessels counts toward the thirty-percent calculation; time on vessels the employer neither owns nor controls does not. For a worker who rotates among an employer's boats, the fleet doctrine is often what carries the duration prong.

This is precisely how the seaman-status fight unfolded in our seaman-status workboat case, where time across two company-owned workboats aggregated to put the worker well past the thirty-percent line — and the defense's "he was a land-based oilfield worker" theory did not survive its own witnesses.

The "nature" half — exposure to the perils of the sea

The connection must be substantial in nature as well as duration. This asks whether the worker is regularly exposed to the perils of the sea — whether his work takes him to sea in a way that subjects him to a seaman's hazards. The Fifth Circuit has refined this inquiry in recent years, most notably in its en banc decision in Sanchez v. Smart Fabricators of Texas — which sharpened how courts distinguish a true sea-based worker from a land-based worker who merely happens to board a vessel. Because that refinement controls how the nature prong is applied in the Fifth Circuit today, it is covered in detail on its own page: see the Sanchez test for seaman status.

Status is usually a jury question

One last point that matters enormously in practice. Seaman status is a mixed question of law and fact, and where the facts (or the inferences from them) are disputed, it is a question for the jury, not for the judge on summary judgment. Defendants frequently move for summary judgment on status hoping to remove the case from the maritime regime and push it into workers' compensation. When the duration and nature of the worker's connection are genuinely contested, that motion should not succeed — the worker is entitled to have a jury decide.

If a defendant or insurer is telling you that you are not a seaman and that workers' compensation is your only remedy, that conclusion is worth testing against the Chandris framework before you accept it. See also the Sanchez test, Jones Act vs. workers' comp, and the firm's complex maritime cases.

In practice

In practice, seaman status is where the defense draws its first line: recast the worker as land-based or platform-bound and the Jones Act disappears. The fight is won with the worker's own assignment, time, and payroll records showing a real connection to a vessel or fleet — which is exactly how the status defense collapsed in the firm's vessel-based-oilfield-worker case, where time across two company workboats put the worker well past the thirty-percent line.

Related case studies

• Seaman Status for a Vessel-Based Oilfield Worker — time across two company workboats defeated the “not a seaman” defense.

Prior results do not guarantee a similar outcome. See all case studies.