The Second Assistant Engineer of Steam, Motor or Gas-Turbine vessels credential allows its holder to act as Second or Third Engineer on a vessel of any horsepower within any propulsion limitation on the license.
For all original and raise of grade of engineer endorsements, at least one-third of the minimum service requirements must have been obtained on the particular mode of propulsion for which applied.
To add a propulsion mode (steam or motor) to an endorsement, the following alternative methods are available to the mariner holding a license or MMC officer endorsement in that grade:
This MMC endorsement may be endorsed as limited to serve on vessels without auxiliary boilers, waste-heat boilers or distilling plants. An applicant may qualify for removal of any of these limitations by completing Coast Guard-approved or -accepted training.
The examination for the Second Assistant is described in the Deck Examination Guide Section 220.127.116.11. If a candidate has previously taken the Third Assistant Engineer's exam, he or she will not be required to test for the raise-in-grade to Chief Engineer.