Hello, teacher. Can senior manager C sit for 18 months before taking the exam for chief engineer C?

Hello, those who apply for the certificate of competency as chief engineer should hold the certificate of competency for large ships in the corresponding navigation area and class, have actually worked for 18 months, and have completed the corresponding post competency training. After completing the pre-test training of the new rules, it is no longer necessary to participate in the transitional competency training. Seafarers should obtain a new training certificate before applying for the "1 1 rules" competency certificate.