Here You Go
http://www.dgca.nic.in/cars/D3C-C8.pdf
Clause 5.3
5.3 Pressurised aircraft to be imported for scheduled operations by regional
airlines shall not be more than 15 years in age or have completed 75
percent of its design economic life or 45,000 pressurisation cycles
whichever is earlier. However, this requirement will not be applicable for
acquisition of Indian registered aircraft maintained in accordance with DGCA
requirements