The Directorate General of Civil Aviation (DGCA) issued the order to all air operators and organisations, state-run or private, to ensure that these personnel obtain DGCA licence by July this year.
The order came in the wake of reports of some accidents involving helicopters, including the one in April 2011 at Tawang, that the pilot and the flight engineers were operating on exemption under Rule 160 of the Aircraft Rules.
They were operating under Rule 160 which says that "the Central Government may, by general or special order in writing, exempt any aircraft or class of aircraft or any person or class of persons from the operation of these rules, either wholly or partially, subject to such conditions, if any, as may be specified in such order."
The aviation regulator has now made it mandatory for army aviation or air force personnel to obtain DGCA licence within the next six months.
The DGCA also warned that non-compliance would attract strict action against the individuals and operators under the prevailing rules, the sources said.