Section 5(1) in The Indian Postal Service (Group 'A') Rules, 1987
(1)The recruitment to the Service, after the initial constitution thereof, shall be made by the following methods:-(a)[ Initial recruitment to the Service shall be made in the Junior Time Scale in the following manner.[Substituted by Notification No. G.S.R. 185(E), dated 18.3.1997](i)By direct recruitment on the basis of results of the Civil Services Examination conducted by the commission;(ii)By promotion in accordance with part-IV,(iii)The number of persons recruited in a year under clause (i) above shall not exceed 25% of the total regular posts in Junior Time Scale, the remaining posts being filled by promotion from Group 'B';(iv)Posts in the Senior Time Scale which cannot be filled on account of officers with requisite years of service in Junior Time Scale not being available can also be added temporally to the Junior Time Scale and filled up by promotion in accordance with part IV, provided that the total number of promottee officers in various grades of the Service shall not, at any time, exceed 33-1/3% of the total cadre strength (excluding training reserve).](b)Vacancies in all other grades of the service shall be filled by promotion in accordance with Part-IV.
