MAHENDRAGIRI (TAMIL NADU), October 13 — The Indian Space Research Organisation (ISRO) on Tuesday achieved a critical propulsion milestone for India's inaugural human spaceflight programme 'Gaganyaan', successfully conducting a 720-second ground qualification hot test of the indigenous CE-20 cryogenic engine at the ISRO Propulsion Complex (IPRC) in Mahendragiri, Tamil Nadu.
According to ISRO mission scientists, the hot-fire sequence validated the engine's combustion stability, chilldown dynamics, turbopump performance, and gimbal actuation across prolonged burning cycles. Operating on a propellant combination of Liquid Hydrogen (LH2 at -253°C) and Liquid Oxygen (LOX at -183°C), the CE-20 engine powers the upper C25 cryogenic stage of the human-rated LVM3 (HLVM3) launch vehicle, generating a nominal vacuum thrust of 20 tonnes. To satisfy stringent Human-Rating Certification standards, the test duration exceeded nominal operational burn times by a safety factor of four.
The space agency confirmed that the engine completed all mandatory endurance thresholds required ahead of the upcoming unmanned orbital test flights (G1 and G2) carrying the humanoid robot 'Vyommitra', paving the runway for the crewed orbital flight (H1).
The architecture of the Gaganyaan mission (deploying a 3-member crew to a 400-km Low Earth Orbit for a 3-day mission), human-rated launch vehicle systems (HLVM3 versus standard LVM3), the physics of staged combustion cryogenic cycles, the Crew Escape System (CES), and international space collaboration (Axiom-4 mission to ISS) are recurring high-scoring areas across UPSC Civil Services (GS-III: Science & Tech) and State PSC examinations.