The GSLV-F10/EOS-03 mission, which lifted off from Sriharikota on August 12 last year, failed due to ‘deviation in the performance’ of the cryogenic upper stage (CUS) of the launch vehicle, a national-level Failure Analysis Committee (FAC) has found.
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Although the Geosynchronous Satellite Launch Vehicle (GSLV) had a normal lift-off after a 26-hour countdown, the mission had to be aborted much to the dismay of the Indian Space Research Organisation (ISRO).
The FAC, consisted of experts from the space agency and the academia, submitted its findings.
The FAC has concluded that a leak in a Vent and Relief Valve (VRV), probably triggered by damage in the soft seal, resulted in lower pressure in the LH2 (Liquid Hydrogen, the propellant) tank when the CUS engine ignited.
This caused the Fuel Booster Turbo Pump (FBTP) to malfunction, ultimately leading to the failure of the mission.
Recommendations include the incorporation of an active LH2 tank pressurisation system for guaranteeing sufficient pressure in the tank before the engine burns. Other recommendations include strengthening the VRV and associated fluid circuits to avoid leakage.
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