The return-to-flight launch of the Indian Geostationary Launch Vehicle (GSLV) was scrubbed due to a leak in the second stage fuel system, according to the Indian Space Research Organization (ISRO).
It was to be the return-to-flight of the GSLV II, an enlarged and refined version of the less-powerful Polar Satellite Launch Vehicle. Though the GSLV has attempted launches a total of six times, the latest marks only the second attempt to launch GSLV II. The first attempt, in 2010, ended in failure.
The leak evidently originates from the system that supplies unsymmetrical dimethylhydrazine (UDMH) fuel to the second stage's single Vikas engine, discovered as the tanks were being pressurised only two hours prior to scheduled launch.
The flight was meant to launch GSAT 14, a satellite built to test and operate indigenously-built Ku- and C-band communications antennas. The GSLV was de-fueled and rolled back to the assembly facility for repairs. A new flight date has not been announced.