Section 171 in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
171. Promotion from Instructor Lieutenant-Commander to Instructor Commander.
(a)By selection. - Promotion shall be made by selection from officers who have attained 2 years' seniority but not more than 10 years' seniority in the rank of Instructor Lieutenant-Commander, subject to vacancies.(b)By time scale. - Substantive promotions to the rank of Instructor Commander of officers, not promoted by selection against the authorised cadre of Instructor Commander, may be made, subject to their being considered fit in all respects, by time-scale on completion of 24 years' reckonable commissioned service, provided they have not attained the age of compulsory retirement. Officers so promoted shall not be reckoned against the authorised cadre of Instructor Commanders, but shall be held in a separate "non-selection" list except that an officer promoted to the acting rank of Instructor Commander before completing 24 years' service and made substantive under this clause while holding the rank of Acting Instructor Commander on completing 24 years' service shall be held against an authorised Instructor Commander's appointment.The authorised cadre of Instructor Lieutenant-Commanders or Lieutenants shall be reduced to the extent of number of officers borne on the "non-selection" list of Instructor Commanders.Explanation. - For purposes of this clause, reckonable commissioned service means the actual commissioned service rendered, except that an ex-Branch List officer may be permitted to reckon on the date of substantive promotion to the rank of Lieutenant-Commander, 11 years' commissioned service or the actual commissioned service, including service in the Branch List, whichever is less.Officers promoted by time scale to the rank of Commander will retain on the non-selection list their inter se seniority as before their promotion.
