Gaganyaan Milestone: Crew Module For First Uncrewed Mission Dispatched After Successful Liquid Propulsion System Integration

In a significant development, the Indian Space Research Organisation (ISRO) has successfully completed the integration of the liquid propulsion system with the crew module for the first uncrewed mission of Gaganyaan project.

After the successful integration, the crew module has been dispatched from ISRO's Liquid Propulsion Systems Centre (LPSC).

"On January 21, 2025, the Liquid Propulsion systems Centre (LPSC) of ISRO dispatched the Crew Module for the first uncrewed mission of Gaganyaan (G1), after successfully completing the integration of the liquid propulsion system," ISRO said in a statement.

The Crew Module Propulsion System (CMPS) is a bi-propellant based Reaction Control System (RCS) and is meant for precise three-axis control (Pitch, Yaw and Roll) of crew module.

According to the ISRO, the control will be initiated following separation of service module during the descent and re-entry phase until the deployment of parachute-based deceleration system.

This system employs twelve 100 newton thrusters, pressurisation system with high pressure gas bottles and the propellant feed system along with the associated fluid control components.

"The Crew Module Uprighting System (CMUS) designed by Vikram Sarabhai Space Centre (VSSC) was also integrated to the module at LPSC," ISRO said.

Subsequently, the Crew Module will undergo further integration operations including avionics package assembly, electrical harnessing and checks at Vikram Sarabhai Space Centre (VSSC) before dispatching to U R Rao Satellite Centre, Bangalore for the final phase of integration of the Orbital Module, it added.

The uncrewed orbital test mission of Gaganyaan is set to be launched in the first half of this year, paving the way for India’s human spaceflight program, aiming to validate systems for crew safety and recovery.

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