46 C.F.R. § 12.15-11 General provisions respecting merchant mariner's documents endorsed as qualified member of the engine department.
Title 46 - Shipping
The holder of a merchant mariner's document endorsed with one or more qualified member of the engine department ratings may serve in any unqualified rating in the engine department without obtaining an additional endorsement. This does not mean that an endorsement of one qualified member of the engine department rating authorizes the holder to serve in all qualified member of the engine department ratings. Each qualified member of the engine department rating for which a holder of a merchant mariner's document is qualified must be endorsed separately. When, however, the applicant qualifies for all ratings covered by a certificate as a qualified member of the engine department, the certification may read QMED—any rating. The ratings are as follows:
(a) Refrigerating engineer. (b) Oiler. (c) Deck engineer. (d) Fireman/Watertender. (e) Junior engineer. (f) Electrician. (g) Machinist. (h) Pumpman. (i) Deck engine mechanic. (j) Engineman. [CGFR 65–50, 30 FR 16640, Dec. 30, 1965, as amended by CGFR 66–46, 31 FR 13649, Oct. 22, 1966; CGD 74–45, 42 FR 24741, May 16, 1977]
Title 46: Shipping
PART 12—CERTIFICATION OF SEAMEN
Subpart 12.15—Qualified Member of the Engine Department
§ 12.15-11 General provisions respecting merchant mariner's documents endorsed as qualified member of the engine department.

