46 CFR § 11.512
Service requirements for national endorsement as first assistant engineer of steam, motor, and/or gas turbine-propelled vessels
April 15, 2021
(a) The minimum service required to qualify an applicant for endorsement as first assistant engineer of steam, motor, and/or gas turbine-propelled vessels is—
(1) One year of service as an assistant engineer while holding a license or MMC with a second assistant engineer endorsement; or
(2) One year of service as a chief engineer (limited) and completing the appropriate examination described in subpart I of this part.
(b) A person holding this endorsement may qualify for an STCW endorsement, according to §§11.327, 11.331, and 11.333 of this part.