India Today reported in its June, 2010 issue that the project to modernize the initial batch of Su-30s delivered to India by Russia has been finalized.
The aircraft are due for major overhaul and Russia has proposed incorporation of the latest technologies during the major overhaul.
Defence Ministry sources told Economic Times on July 4, 2010:
"As part of IAF's modernisation programme, we are going to upgrade
50 Sukhoi-30 MKI aircraft with help of original equipment manufacturers (OEMs) from Russia.
"Su-30 MKIs have been inducted into the IAF in four phases. The ones to be upgraded are from the first phase and the project is likely to be completed in the next three to four years," they added.
Of the
50 aircraft, around five would be sent to the Russian facilities while the remaining would undergo upgrading within India, they said.
"The airframe of these aircraft would also be strengthened to equip them with air-launched version of the 290 km range BrahMos supersonic cruise missile," the sources said.
The SU-30s were inducted into the IAF in late 90s and at present six squadrons of the aircraft are in service.
Here is the link
IAF to upgrade SU-30 fighter aircraft - Economic Times
Major source of information
http://idp.justthe80.com/air-force-projects/fighters/su-30mki-acquisition-and-upgrade#TOC-AESA-Radar