Section 20(5) in The Indian Postal Service (Group 'A') Rules, 1987
(5)Senior Administrative Grade. - Appointments in the Senior Administrative Grade of the service shall be made on the recommendations of a duly constituted Departmental Promotion Committee by selection on merit from amongst officers of the Junior Administrative Grade of the service with eight years regular service in the grade(including service, if any, in non-functional selection grade) or seventeen years regular services in Group 'A' posts out of which at least four years regular service should be in the Junior Administrative Grade.
