The Indian Space Research Organisation (ISRO) has successfully completed the flight acceptance test of the cryogenic engine that will power the upper stage of its GSLV-F19 mission, the space agency announced on November 10. The engine will be inducted into the cryogenic stage of GSLV-F19, which is set to launch the NVS-04 navigation satellite.

Source: ISRO announcement, reported by India Today

The 200-second hot-fire test was conducted on November 5 at the ISRO Propulsion Complex (IPRC) in Mahendragiri, Tamil Nadu. ISRO said the engine's Main Engine and Gas Generator ignited as expected and its performance stayed in line with pre-test predictions throughout the firing.

NVS-04 is the fourth satellite in ISRO's second-generation navigation series for NavIC — Navigation with Indian Constellation — India's own regional satellite navigation system. The flight acceptance test is one of the final ground checks an engine clears before it is cleared to fly.

The test comes days after ISRO launched the previous satellite in the series, NVS-03, aboard GSLV-F18 from Sriharikota on October 30, as the agency rebuilds and expands the NavIC constellation. Each new NVS satellite strengthens India's independent positioning and timing services, reducing reliance on foreign systems.

ISRO has not yet announced a launch date for GSLV-F19. The next steps are integrating the tested engine into the cryogenic stage, completing vehicle assembly and running the remaining pre-launch checks.