Engineering was the discipline applying engineering sciences, mostly mechanical and electrical, to the development, design, operation and maintenance of spacecraft propulsion and on-board systems.
A starship's engineering department was usually overseen by the Chief Engineering Officer, or Chief Engineer. (HH1)
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The engineering department of Royal Manticoran Navy vessels was usually made up of six sections divided into two groups:: propulsion group (impeller, power, and gravitics technicians) and Environmental Group (environmental, hydroponics, and damage control technicians). (TRMN BuTrain-001, Student Manual)