Gaganyaan: ISRO Completes Crew Module-Service Module Separation Tests Before First Uncrewed Flight
The Indian Space Research Organisation (ISRO) has completed a series of Crew Module (CM)-Service Module (SM) separation tests for the Gaganyaan human spaceflight programme. The tests come ahead of G1, the first uncrewed Gaganyaan flight, which is targeted for launch this year.
The CM and SM together form the Gaganyaan Orbital Module. They are joined by a separation system and linked by umbilical connections (cables and pipes) that carry electricity and fluids between them. They fly as one unit from launch until the end of the time in orbit.
Before the return journey into Earth's atmosphere (re-entry), the CM must separate cleanly from the SM. This involves several precisely timed events using pyrotechnic devices (small, controlled explosive charges) and jettisoning systems.
The tests were done on a special setup at the Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram. They simulated cutting the umbilical connections and checked that the separation system works and that key CM systems survive the shock.
Systems checked included avionics (onboard electronics), inertial navigation, the thermal protection system on the aft (rear) and conical heat shields, the deployable umbilical shield, and pyrotechnics of the crew module up-righting system.
The full Gaganyaan mission aims to take a crew of three to an orbit of 400 km for a three-day mission and bring them back safely by landing in Indian sea waters.
Gaganyaan Programme: India's Human Spaceflight Mission
Gaganyaan is India's programme to send Indian astronauts into space on an Indian rocket and bring them back safely. Its first goal is to take a crew of three to a low orbit about 400 km above Earth, keep them there for up to three days, and land them safely in the sea near India. It is run by ISRO. If it succeeds, India will become the fourth country, after the former Soviet Union (now Russia), the United States and China, to send humans into space on its own.
The CM-SM separation tests at VSSC check one of the most critical moments of every Gaganyaan flight: letting the Crew Module break away cleanly before re-entry. Passing these tests gives ISRO confidence for the first uncrewed G1 flight, which must succeed before any Indian crew can fly.
Bharatiya Antariksh Station (BAS)
The Bharatiya Antariksh Station (BAS) is India's planned space station: a large laboratory and home that will stay permanently in orbit around Earth, where Indian astronauts can live and work for weeks or months. It will be built in pieces, called modules, launched one by one and joined together in space. The first module, BAS-1, is targeted for 2028, and the full station with five modules is expected by 2035. Today, the only space station run by a single country is China's Tiangong; the International Space Station is shared by several partners. BAS would make India, after China, only the second country of today to run a national space station of its own (the Soviet Union and the US ran their own stations in the past, such as Salyut, Mir and Skylab).
Every crew that will one day travel to the Bharatiya Antariksh Station will ride in a Gaganyaan Crew Module. Tests like the CM-SM separation tests are therefore early building blocks not just for Gaganyaan's first flights, but for India's whole plan of a space station by 2035 and a Moon landing by 2040.
- Tests completed: Crew Module-Service Module separation tests, at Vikram Sarabhai Space Centre, Thiruvananthapuram
- Orbital Module = Crew Module + Service Module; joined by a separation system and umbilical connections
- Separation uses precisely sequenced pyrotechnic devices and jettisoning systems; happens before re-entry
- Systems validated: avionics, inertial navigation, thermal protection (aft and conical heat shields), deployable umbilical shield, crew module up-righting system pyrotechnics, thermal and humidity control
- Next step: G1, first uncrewed Gaganyaan flight, with the half-humanoid robot Vyommitra
- Gaganyaan goal: 3 crew, 400 km orbit, 3 days, landing in Indian sea waters
- Gaganyaan total cost (revised 2024): ₹20,193 crore, 8 missions by December 2028