The Indian Space Research Organisation successfully conducted the first hot test of the system demonstration model of the Gaganyaan service module propulsion system. ISRO in its official statement said that the system performance met the test objectives and there was a close match with the pre-test predictions.

A series of hot tests will also be conducted to replicate various mission conditions as well as off-nominal situations. The test lasted 450 seconds and took place at the Isro Propulsion Complex's test site in Mahendragiri, Tamil Nadu. According to the announcement, the service module is part of the Gaganyaan Orbital module and is placed beneath the crew module, where it will remain linked until re-entry. The statement added that the service module propulsion system consists of a unified bipropellant system consisting of 5 nos. of 440 N thrust engines and 16 nos. of 100 N Reaction Control system thrusters with MON-3 and MMH as oxidizer and fuel, respectively. 

On August 28, 2021, ISRO successfully conducted the first hot test of the System Demonstration Model (SDM) of the Gaganyaan Service Module Propulsion System at the test facility of ISRO Propulsion Complex (IPRC), Mahendragiri, Tamil Nadu. https://t.co/7XstXIkJjB pic.twitter.com/gCZyNGoIoO

? ISRO (@isro) August 28, 2021

Earlier, on July 14, the space agency had conducted the third long-duration hot test on the liquid propellant Vikas engine to launch the Gaganyaan mission. As per the ISRO, the test of the Vikas engine was done for the core L110 liquid stage of the human-rated GSLV MkIII vehicle, as part of the engine qualification requirements for the Gaganyaan program. Prime Minister Narendra Modi made the formal announcement of the Gaganyaan program during his Independence Day address on August 15, 2018.

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