46 CFR 13.403: Switching Tank Vessel-Assistant DL and LG endorsements

Last reviewed: October 14, 2026

This section covers applicants who hold an MMC endorsed as Tank Vessel-Assistant for DL and seek one for LG, or the converse. Each applicant must either provide evidence of at least half the service and pass a professional examination, or complete a course. Paragraph (b) is reserved.

Applies toApplicants already holding an MMC endorsed as Tank Vessel-Assistant for DL who seek one for LG, or the converse.

What it says

  1. Each applicant already holding an MMC endorsed as Tank Vessel-Assistant for DL and seeking one for LG, or the converse, must meet one of the two options in paragraph (a).

    46 CFR 13.403(a)“Each applicant already holding an MMC endorsed as Tank Vessel-Assistant for DL and seeking one for LG, or the converse, must—”

  2. The first option is to provide evidence of at least half the service required in § 13.401(e)(2) and successfully complete a professional examination for the topics identified in table 1 to § 13.121(e) appropriate to the endorsement applied for.

    46 CFR 13.403(a)(1)“Provide evidence of at least half the service required in § 13.401(e)(2) and successfully complete a professional examination for the topics identified in table 1 to § 13.121(e) appropriate to the endorsement applied for; or”

  3. The second option is to complete a course in DL or LG appropriate to the endorsement applied for, as prescribed in § 13.401(e)(1).

    46 CFR 13.403(a)(2)“Complete a course in DL or LG appropriate to the endorsement applied for as prescribed in § 13.401(e)(1).”

Common questions

How can I add an LG endorsement to my DL Tank Vessel-Assistant MMC?

You must meet one of two options. You may provide evidence of at least half the service required in § 13.401(e)(2) and pass a professional examination appropriate to the endorsement, or complete a course under § 13.401(e)(1).

“Each applicant already holding an MMC endorsed as Tank Vessel-Assistant for DL and seeking one for LG, or the converse, must—”

Can I take a course instead of the service and exam?

Yes. Completing a course in DL or LG appropriate to the endorsement applied for, as prescribed in § 13.401(e)(1), is the alternative to the service and examination option.

“Complete a course in DL or LG appropriate to the endorsement applied for as prescribed in § 13.401(e)(1).”

What exam topics apply if I choose the service option?

The professional examination covers the topics identified in table 1 to § 13.121(e) appropriate to the endorsement applied for.

“Provide evidence of at least half the service required in § 13.401(e)(2) and successfully complete a professional examination for the topics identified in table 1 to § 13.121(e) appropriate to the endorsement applied for; or”

The text of 46 CFR 13.403

Electronic Code of Federal Regulations (eCFR), current as of April 16, 2026 · Read it on eCFR

Service requirements

(a) Each applicant already holding an MMC endorsed as Tank Vessel-Assistant for DL and seeking one for LG, or the converse, must—

(1) Provide evidence of at least half the service required in § 13.401(e)(2) and successfully complete a professional examination for the topics identified in table 1 to § 13.121(e) appropriate to the endorsement applied for; or

(2) Complete a course in DL or LG appropriate to the endorsement applied for as prescribed in § 13.401(e)(1).

(b) [Reserved]

Sections it refers to

The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of April 16, 2026. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.