The second stage used the same hypergolic propellants, whilst the third stage was the new Cryogenic Upper Stage (CUS), burning liquid hydrogen oxidised by liquid oxygen. The rocket's first and second stages performed normally, and at the time controllers reported that third stage ignition had occurred. However, shortly afterwards the rocket began to under-perform, tumbling out of control, and deviating from its planned trajectory. Around 300 seconds into the flight, contact with the rocket was lost. Initial analysis of the data suggested that the vernier thrusters, used to provide attitude control, had failed to ignite due to engineering problems. On 17 April, ISRO announced that further analysis of the data indicated that the third stage main engine had not ignited either. According to ISRO, mission failed after the fuel turbo pump that supplied fuel to the cryogenic engine had stopped working a second after ignition. References External links "GSLV-D3". ISRO. Retrieved 22 October 2011. GSAT satellites Spacecraft launched in 2010 Satellite launch failures 2010 in India Spacecraft launched by GSLV rockets