46 CFR § 13.503 - Service requirements.

---
identifier: "/us/cfr/t46/s13.503"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 13.503 - Service requirements."
title_number: 46
title_name: "Shipping"
section_number: "13.503"
section_name: "Service requirements."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "B"
subchapter_name: "MERCHANT MARINE OFFICERS AND SEAMEN"
part_number: "13"
part_name: "CERTIFICATION OF TANK VESSEL PERSONNEL"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 3703, 7317, 8105, 8703, 9102; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGD 79-116, 60 FR 17142, Apr. 4, 1995, as amended by USCG-2021-0097, 89 FR 93106, Nov. 25, 2024, unless otherwise noted."
cfr_part: "13"
---


# 13.503 Service requirements.

(a) Each applicant for a Tank Vessel-Engineer endorsement must provide evidence of at least—

(1) 90 days of service as an engineering officer on tankships or self-propelled tank vessels certified to carry DL or LG appropriate to the endorsement applied for;

(2) 90 days of rating or cadet service in the engine department on tankships or self-propelled tank vessels certified to carry DL or LG appropriate to the endorsement applied for; or

(3) A combination of the service in paragraphs (a) (1) and (2) of this section.

(b) Each applicant already holding an MMC endorsed as Tank Vessel-Engineer for DL and seeking an endorsement for LG, or the converse, must prove at least half the service required by paragraph (a) of this section.

[CGD 79-116, 60 FR 17142, Apr. 4, 1995, as amended by CGD 79-116, 62 FR 25134, May 8, 1997; USCG-2006-24371, 74 FR 11260, Mar. 16, 2009; USCG-2004-17914, 78 FR 77997, Dec. 24, 2013; USCG-2021-0834, 89 FR 102337, Dec. 17, 2024]