Gaganyaan: ISRO completes key test ahead of first uncrewed mission

The Indian Space Research Organisation (ISRO) has successfully completed a critical test for the Gaganyaan mission, a significant step towards India's first uncrewed mission. Gaganyaan aims to demonstrate human spaceflight capabilities by launching a crew of three members to an orbit of 400 km for a three-day mission and safely returning them to earth via Indian sea waters. The test focused on the Crew Module (CM)-Service Module (SM) separation system, which is essential for the mission's success.

The Crew Module (CM) and Service Module (SM) are connected using a separation system and umbilical connections to ensure electrical and fluid servicing between them. These modules are integrated prior to launch and function as a single unit until the on-orbit phase of the mission. Before re-entering Earth's atmosphere, the CM is separated from the SM, involving multiple precisely sequenced separation events using pyrotechnic devices and jettisoning systems.

To validate the overall design adequacy of the separation system, ISRO set up a test at the Vikram Sarabhai Space Centre in Thiruvananthapuram. This test simulated the CM-SM separation scenario by severing several umbilical connections between the modules. The tests demonstrated robustness and shock-survivability of various critical subsystems in the CM, including avionics systems, inertial navigation systems, thermal protection systems, crew module deployable umbilical shields, pyrotechnic devices for crew module uprighting, and thermal and humidity control systems.

ISRO's successful completion of this key test provides necessary confidence in the functioning of the CM-SM separation system for the upcoming G1 mission, marking a significant milestone in India's human spaceflight endeavors.