29 C.F.R. § 2530.200b-6 – Maritime industry.

(a) General. Sections 202(a)(3)(D), 203(b)(2)(D) and 204(b)(3)(E) of the Act and sections 410(a)(3)(D) and 411(a)(5)(D) and (b)(3)(E) of the Code contain special provisions applicable to the maritime industry. In general, those provisions permit statutory standards otherwise expressed in terms of 1,000 hours of service to be applied to employees in the maritime industry as if such standards were expressed in terms of 125 days of service. A plan covering employees in the maritime industry may nevertheless credit service to such employees on the basis of hours of service, as prescribed in § 2530.200b-2, including the use of any equivalency permitted under § 2530.200b-3, or may credit service to such employees on the basis of elapsed time, as permitted under § 2530.200b-9.
(b) Definition. For purposes of sections 202, 203, and 204 of the Act and sections 410 and 411 of the Code, the maritime industry is that industry in which employees perform duties on board commercial, exploratory, service or other vessels moving on the high seas, inland waterways, Great Lakes, coastal zones, harbors and noncontiguous areas, or on offshore ports, platforms or other similar sites.
(c) Computation periods. For employees in the maritime industry, computation periods shall be established as for employees in any other industry.
(d) Year of service. To the extent that a plan covers employees engaged in the maritime industry, and credits service for such employees on the basis of days of service, such employees who are credited with 125 days of service in the applicable computation period must be credited with a year of service. In the case of a plan covering both employees engaged in the maritime industry and employees not engaged in the maritime industry, service of employees not engaged in the maritime industry shall not be determined on the basis of days of service.
(e) Year of participation for benefit accrual. A plan covering employees engaged in the maritime industry may determine such an employee's period of service for purposes of benefit accrual on any basis permitted under §§ 2530.204-2 and 2530.204-3. For purposes of § 2530.204-2(c) (relating to partial years of participation), in the case of an employee engaged in the maritime industry who is credited by the plan on the basis of days of service and whose service is not less than 125 days of service during an accrual computation period, the calculation of such employee's period of service for purposes of benefit accrual shall be treated as not made on a reasonable and consistent basis if service during such computation period is not taken into account. Thus, the employee must be credited with at least a partial year of participation (but not necessarily a full year of participation) for that accrual computation period, in accordance with § 2530.204-2(c).
(f) Employment commencement date. For purposes of § 2530.200b-4 (relating to breaks in service) and § 2530.202-2 (relating to eligibility computation periods):
1. (1) The employment commencement date of an employee engaged in the maritime industry who is credited by the plan on the basis of days of service shall be the first day for which the employee is entitled to be credited with a day of service described in § 2530.200b-7(a)(1).
2. (2)
  1. (i) Except as provided in paragraph (f)(2)(ii) of this section, the reemployment commencement date of an employee engaged in the maritime industry shall be the first day for which the employee is entitled to be credited with a day of service described in § 2530.200b-7(a)(1) after the first eligibility computation period in which the employee incurs a 1-year break in service following an eligibility computation period in which the employee is credited with more than 62 days of service.
  2. (ii) In the case of an employee engaged in the maritime industry who is credited with no hours of service in an eligibility computation period beginning after the employee's reemployment commencement date established under paragraph (f)(2)(i) of this section, the employee shall be treated as having a new reemployment commencement date as of the first day for which the employee is entitled to be credited with day of service described in § 2530.200b-7(a)(1) after such eligibility computation period.