GSLV MKIII, the future launch vehicle of ISRO, capable of launching 4-ton class spacecraft into Geosynchronous Transfer Orbit (GTO) is in the advanced stage of realisation. It consists of two solid strap-on (S200) motors, one earth storable liquid core stage (L110) and the indigenously developed C25 cryogenic stage. The C25 stage is powered by CE20 cryogenic engine. The first CE20 flight engine acceptance test was successfully conducted for a duration of 25 seconds in high altitude simulation test facility during December 2016.