Gaganyaan Mission: ISRO Achieves Milestone in Human Rating CE20 Cryogenic Engine

ISRO has accomplished a major milestone in the human rating of its CE20 cryogenic engine that powers the cryogenic stage of the human-rated LVM3 launch vehicle for Gaganyaan missions, with the completion of the final round of ground qualification tests on February 13, 2024. The final test was the seventh of a series of vacuum ignition tests carried out at the High Altitude Test Facility at ISRO Propulsion Complex, Mahendragiri, to simulate the flight conditions.

The ground qualification tests for the human rating of the CE20 engine involved life demonstration tests, endurance tests, and performance assessment under nominal operating conditions as well as off-nominal conditions w.r.t thrust, mixture ratio, and propellant tank pressure. All the ground qualification tests of the CE20 engine for the Gaganyaan programme have been successfully completed.

"ISRO's CE20 cryogenic engine is now human-rated for Gaganyaan missions," the space agency said on X (Formerly known as Twitter) on Wednesday.

Mission Gaganyaan:
ISRO's CE20 cryogenic engine is now human-rated for Gaganyaan missions.

Rigorous testing demonstrates the engine’s mettle.

The CE20 engine identified for the first uncrewed flight LVM3 G1 also went through acceptance tests.https://t.co/qx4GGBgZPvpic.twitter.com/UHwEwMsLJK

— ISRO (@isro) February 21, 2024

In order to qualify the CE20 engine for human rating standards, four engines have undergone 39 hot firing tests under different operating conditions for a cumulative duration of 8810 seconds against the minimum human rating qualification standard requirement of 6350 seconds.

ISRO has also successfully completed the acceptance tests of the flight engine identified for the first unmanned Gaganyaan (G1) mission tentatively scheduled for Q2 of 2024. This engine will power the upper stage of the human-rated LVM3 vehicle and has a thrust capability of 19 to 22 tonnes with a specific impulse of 442.5 seconds.