qualified member of the engine department

In merchant shipping, a motorman is an engine department rating aboard a vessel, responsible for supporting the operation, maintenance, and repair of engine room machinery and related equipment. The duties of a motorman typically include assisting with routine watchkeeping and machinery inspections, lubrication and upkeep of auxiliary systems, and other routine engine room tasks as directed by senior engineering personnel. The specific scope of duties varies with vessel type and company practice. While “motorman” is commonly used informally to describe a general engine room rating, it is not itself a defined regulatory term in U.S. merchant marine regulations. A motorman serves under the supervision of licensed engineering officers, typically held by the chief engineer or, among ratings, b...