In March 2009, the Indian Air Force expressed concern after 90 MiG-29s were grounded in Russia. After carrying out an extensive inspection, the IAF cleared all MiG-29s in its fleet as safe in March 2009. In a disclosure in Parliament, Defence Minister A. K. Antony said the MiG-29 is structurally flawed in that it has a tendency to develop cracks due to corrosion in the tail fin. Russia has shared this finding with India, which emerged after the crash of a Russian Air Force MiG-29 in December 2008. "A repair scheme and preventive measures are in place and IAF has not encountered major problems concerning the issue," Antony said. Despite concerns of Russia's grounding, India sent the first six of its 78 MiG-29s to Russia for upgrades in 2008. The upgrade program will fit the MiGs with a phased array radar (PESA) and in-flight re-fuelling capability.