Every engineer officer who is qualified to serve as second engineer officer on ships powered by main propulsion machinery of 3000 kW propulsion power or more, may serve as chief engineer officer on ships powered by main propulsion machinery of less than 3000 kW propulsion power, provided that the certificate is so endorsed.
Kõik laevamehaanikud, kellel on õigus teenida 3000 kW ja suurema peamasinate efektiivse koguvõimsusega laevadel teise mehaanikuna, võivad teenida vanemmehaanikuna laevadel, mille peamasinate efektiivne koguvõimsus on väiksem kui 3000 kW, tingimusel et tunnistusel on sellekohane kinnitus.