ISRO Completes Gaganyaan Crew Module-Separation Tests, Clears Key Step for Uncrewed G1 Mission

Bengaluru, October 16, 2026 — The Indian Space Research Organisation (ISRO) has completed a key set of Crew Module–Service Module separation tests for the Gaganyaan human spaceflight programme, clearing an important engineering checkpoint ahead of the first uncrewed mission targeted for 2026.

The tests were carried out at the Vikram Sarabhai Space Centre (VSSC) in Thiruvananthapuram and were designed to validate the sequence by which the Crew Module will detach from the Service Module before atmospheric re-entry. ISRO said the results provide confidence in the separation system planned for Gaganyaan-1, or G1, the programme’s first uncrewed flight.

Gaganyaan’s Orbital Module is made up of two major sections. The Crew Module is the pressurised cabin that will carry astronauts on crewed missions and, on uncrewed flights, systems and the half-humanoid robot Vyommitra. The Service Module supplies power, propulsion and other support functions. The two modules are connected by a separation system and also linked through umbilical connections that carry electrical power and fluids.

Before launch, the modules are integrated and operate as a single unit through liftoff and the on-orbit phase. The separation step becomes critical later in the mission, when the Crew Module must disconnect cleanly from the Service Module before it returns through Earth’s atmosphere. That sequence has to occur precisely, and ISRO’s latest testing was aimed at proving that the design can perform as intended.

To do that, ISRO built a test setup at VSSC that simulated the integrated CM-SM assembly and was fitted with extensive instrumentation. The tests recreated the separation scenario, including the cutting of several umbilical connections between the two modules. According to ISRO, the work involved multiple precisely sequenced events using pyrotechnic devices and jettisoning systems.

ISRO said the tests confirmed the adequacy of the CM-SM separation design. They also demonstrated the robustness and shock-survivability of a number of critical Crew Module subsystems, including the avionics systems, inertial navigation systems, the thermal protection system on the aft and conical heat shields, the Crew Module deployable umbilical shield, and pyrotechnic devices linked to the Crew Module uprighting system as well as the thermal and humidity control system.

The agency said the successful trials give the necessary confidence in the separation system implemented for G1. That mission is intended to validate spacecraft systems, life-support functions and recovery procedures before any crewed launch. Gaganyaan aims to demonstrate India’s human spaceflight capability by sending a crew of three to a 400 km orbit for a three-day mission and bringing them back safely for splashdown in Indian sea waters.

The first uncrewed flight is targeted within 2026, and more uncrewed missions are planned before the programme’s maiden crewed launch. ISRO’s latest tests follow earlier qualification work on Crew Module systems completed earlier in 2026, including the uprighting system, umbilical connect-disconnect mechanisms and apex cover separation loads.

Taken together, the ground tests are part of the broader preparation for the human-rated LVM3 launch vehicle and the Gaganyaan mission architecture, as India moves ahead with its first indigenous orbital human spaceflight programme.