By Vikas Sir, Founder & Senior Faculty – Cosmo Classes | 10 July 2026

The Indian Space Research Organisation (ISRO) conducted a flight acceptance hot test of the CE20 cryogenic engine on 6 July 2026 at the ISRO Propulsion Complex (IPRC), Mahendragiri, Tamil Nadu. The engine is intended for the upper stage of the LVM3 launch vehicle for its seventh operational mission, LVM3-M7, and the successful test clears a crucial step towards that launch.

The CE20 is an indigenous cryogenic upper-stage engine developed for the LVM3. A cryogenic engine uses propellants stored at extremely low temperatures - typically liquid hydrogen (LH2) as fuel and liquid oxygen (LOX) as oxidiser - which deliver very high efficiency and thrust, making them essential for launching heavy payloads into higher orbits. Mastering cryogenic technology places India in a small group of nations with this advanced capability.

For the first time in a flight acceptance test, ISRO used a newly developed Nozzle Protection System, which enables testing under simulated high-altitude conditions. During the test the engine ran at 19.5 tonnes of thrust for 45 seconds and then at its maximum rated thrust of 22 tonnes for 25 seconds, demonstrating stable performance across its operating range. The tested engine will be integrated with the C32 cryogenic stage for LVM3-M7 after refurbishment.

LVM3 is India’s heavy-lift launch vehicle used for major national missions, and the CE20 has already flown successfully in eight consecutive LVM3 missions, including Chandrayaan-2, Chandrayaan-3 and three commercial launches. Importantly, the CE20 has also met human-rating qualification requirements for India’s Gaganyaan human spaceflight programme. Human-rating refers to the stringent technical qualification standards applied to systems intended for crewed missions, underlining the CE20’s central role in India’s future manned space ambitions.

Exam Facts

▶ The CE20 is the cryogenic engine used in the upper stage of LVM3.

▶ The hot test was conducted at Mahendragiri, Tamil Nadu (ISRO Propulsion Complex).

▶ Cryogenic engines use liquid hydrogen + liquid oxygen propellants.

▶ The CE20 has met human-rating requirements for the Gaganyaan programme.

▶ LVM3 carried the Chandrayaan-2 and Chandrayaan-3 missions.

▶ Test thrust profile: 19.5 t for 45 s, then 22 t for 25 s.

▶ The engine will be integrated with the C32 cryogenic stage for LVM3-M7.

Practice Set (10 Questions)

Q1. The CE20 is which type of engine?
A. Solid-fuel engine
B. Liquid-fuel engine
C. Cryogenic upper-stage engine
D. Semi-cryogenic engine

Show Answer

Answer: C – Cryogenic upper-stage engine.

Q2. The CE20 engine is used in which launch vehicle?
A. PSLV
B. GSLV Mk-I
C. LVM3
D. SSLV

Show Answer

Answer: C – LVM3.

Q3. The hot test of the CE20 was conducted at:
A. Sriharikota
B. Mahendragiri
C. Thiruvananthapuram
D. Bengaluru

Show Answer

Answer: B – Mahendragiri, Tamil Nadu.

Q4. Cryogenic engines typically use which propellants?
A. Kerosene and LOX
B. Liquid hydrogen and liquid oxygen
C. Solid propellant
D. Hydrazine

Show Answer

Answer: B – Liquid hydrogen and liquid oxygen.

Q5. The CE20 has met human-rating requirements for which programme?
A. Aditya-L1
B. Gaganyaan
C. Mangalyaan
D. NavIC

Show Answer

Answer: B – Gaganyaan.

Q6. LVM3 is best described as India's:
A. Small satellite launch vehicle
B. Heavy-lift launch vehicle
C. Reusable launch vehicle
D. Sounding rocket

Show Answer

Answer: B – Heavy-lift launch vehicle.

Q7. Which missions were launched by LVM3?
A. Chandrayaan-1 and Mangalyaan
B. Chandrayaan-2 and Chandrayaan-3
C. Aditya-L1 and NavIC
D. RISAT and Cartosat

Show Answer

Answer: B – Chandrayaan-2 and Chandrayaan-3.

Q8. The newly developed system used for the first time in the test was the:
A. Nozzle Protection System
B. Heat Shield System
C. Payload Fairing
D. Strap-on Booster

Show Answer

Answer: A – Nozzle Protection System.

Q9. The maximum rated thrust of the CE20 in the test was:
A. 19.5 tonnes
B. 22 tonnes
C. 45 tonnes
D. 25 tonnes

Show Answer

Answer: B – 22 tonnes.

Q10. The tested CE20 engine will be integrated with which cryogenic stage?
A. C25
B. C32
C. S200
D. L110

Show Answer

Answer: B – C32.

UPSC / RPSC Relevance

  • UPSC Prelims: Science & Technology and Current Affairs (space missions, cryogenic technology).
  • UPSC Mains – GS Paper III: Science & Technology - developments in space, indigenisation and their applications.
  • RPSC (RAS) Prelims & Mains: Science & technology and current affairs - India’s space programme and achievements.

UPSC Mains Descriptive Question

Q. Discuss the strategic significance of India’s indigenous cryogenic engine technology in the context of its heavy-lift launch capability and the Gaganyaan human spaceflight programme. (250 words, 15 marks)

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