Section 12(3)(a) in The Assam Engineering (Public Works Department) Service Rules, 1978
(a)(i)he has rendered the minimum continuous service in the cadre of Assistant Executive Engineer/Deputy Architect/Assistant Architect/Assistant Research Officer as the case may be for a period of 5 years on the first January of the year of promotion, and(ii)for promotion to the rank of Assistant Executive Engineer he has rendered the minimum continuos service in the cadre of Assistant Engineer for 5 years and he has successfully undergone the training and has passed the departmental examination, in Departmental Engineering and P.W.D. Accounts.