(b)The Director-General shall notify the maintenance requirements and approve the maintenance system keeping in view-(i)the continued airworthiness of the aircraft and the maintenance facilities required;(ii)the period in terms of flight time, calendar time or any other basis, which may elapse with safety between inspections, tests, or overhauls or any other maintenance work;(iii)the content and period of preservation of the records kept in respect of maintenance.](iv)type of operation in which the aircraft is engaged;(v)any conditions like dust, salt-air climatic conditions or other factors and the routes flown or basis used which may have an effect upon airworthiness; and(vi)any other relevant considerations.