Section 12(1) in The Assam Engineering (Public Works Department) Service Rules, 1978
(1)All vacancies in Class I Services and Executive Engineer, Architect, Deputy Architect, Research Officer of Class I, Junior Grade shall be filled by promotion :Provided that the Governor may, for good and sufficient reasons, fill up any of the posts in Class I (Senior Grade) for specialised investigation, design and research post temporarily or on tenure by transfer or deputation from outside the service, if it is satisfied that there is no suitable officer in the service available for filling the vacancies.
