ISRO Announced on 16 October 2026 That Gaganyaan's Crew Module and Service Module Separation Tests Are Complete, Clearing the Split That Starts the Capsule's Return Before the First Uncrewed Flight

On 16 October 2026 the Indian Space Research Organisation (ISRO) reported that it had completed a series of Crew Module and Service Module separation tests for Gaganyaan, India’s human spaceflight programme. The tests ran at the Vikram Sarabhai Space Centre (VSSC) in Thiruvananthapuram. ISRO says they validated the design of the separation system and showed that several critical systems inside the crew module survive the shock of separating, which it says gives “necessary confidence” for G1, the first uncrewed Gaganyaan flight.

G1 is targeted for launch in 2026, according to the same release. The ISRO chairman, V. Narayanan, was reported on 25 October as saying the flight is about two months away.

The split that starts the trip home

Gaganyaan’s Orbital Module has two halves. The Crew Module is the habitable capsule: ISRO describes it as a double-walled structure with a pressurised metal inner shell and an unpressurised outer shell carrying the thermal protection system, and says it houses the crew interfaces, life support, avionics and the deceleration systems. The Service Module is an unpressurised structure that holds the thermal, propulsion, power and avionics systems and supports the capsule while it is in orbit.

ISRO’s release says the two are integrated before launch and act as one unit from lift-off until the end of the on-orbit phase. Before re-entry into the atmosphere begins, the Crew Module separates from the Service Module. That separation is a chain of sequenced events using pyrotechnic devices (small explosive charges) and jettisoning systems. Electrical and fluid supplies pass between the modules through umbilical connections, which have to be severed in the process.

The Service Module does real work until that moment. ISRO’s account of its propulsion system lists orbit circularisation, control in orbit, the de-boost manoeuvre that lowers the spacecraft’s speed for return, and an abort during the climb to orbit. The capsule then continues alone, which is why the release treats the separation as a distinct milestone.

What ISRO built and ran at VSSC

ISRO says it realised a test setup at VSSC that simulated the overall Crew Module and Service Module assembly, fitted with extensive instrumentation. The tests simulated the separation, including the severing of several umbilical connections between the two modules. The agency published a 22-second video of the rig before and after the test.

The release names what had to come through the jolt. These were the avionics systems, the inertial navigation systems, the thermal protection system in the aft and conical heat shields, the Crew Module Deployable Umbilical Shield, and the pyrotechnic devices of the Crew Module Uprighting System and of the Thermal and Humidity Control System. ISRO says the tests demonstrated “robustness and shock-survivability” of these subsystems.

ISRO’s July 2026 release explains one of them. The uprighting system exists because the capsule must sit the right way up after splashdown, one of the crew safety requirements, and ISRO developed a system based on stored cold gas to meet it. The heat shields protect the capsule through re-entry, the phase the separation clears the way for.

The release does not give the number of tests, the dates they were run, the size of the shocks or the pass criteria. ANI’s account of the announcement, carried by Republic World, and StratNews Global’s report both repeat the ISRO text and add no test data.

The July qualification tests behind it

On 12 July 2026 ISRO announced three qualification tests of crew module systems. The first inflated the primary flotation of the uprighting system from its gas bottle, and ISRO says it met the function, performance and inflation-time requirements across the full range of bottle pressures.

The second separated one half of the umbilical link between the modules. ISRO describes the Crew Module Service Module Connect and Disconnect System as the electrical and fluid link between the two, with a half on each module. After the Service Module is released at the first half, the half on the capsule side is separated before re-entry. The test, on a simulated crew module, showed a clean separation and structural stability of the module panel, in ISRO’s words, with the required design margins.

The third applied about 1.75 times the estimated reaction loads of the apex cover separation to a simulated crew module. The apex cover shields the parachutes and is thrown off at a set altitude by pyrotechnic thrusters before they deploy. ISRO says the measured strains and deformations confirmed the design margins.

The October tests took these single-system results and ran the whole separation together. Elsewhere in the programme, the second Integrated Air Drop Test on 10 April 2026 dropped a simulated crew module of about 5.7 tonnes, which ISRO says equals the module’s mass on G1, from an Indian Air Force Chinook and validated the parachute-based deceleration systems. Our piece on the Gaganyaan test flights covers that test and the escape-system flight of 2023.

On the Service Module side, ISRO reported on 11 July 2025 that it had finished qualifying the propulsion system with a full-duration, 350-second hot test at the ISRO Propulsion Complex in Mahendragiri. A test-bed version of the system had run 25 tests for a cumulative 14,331 seconds, the release says. The system was designed and built by the Liquid Propulsion Systems Centre.

Where G1 stands as of 5 November 2026

The Department of Space told the Rajya Sabha on 6 August 2026 that the propulsion systems of the Crew Module and Service Module have been developed, tested and qualified. The same PIB release lists the thermal protection system, deceleration system, uprighting system and end-to-end avionics as developed and tested, and puts the first uncrewed flight, carrying the half-humanoid robot Vyommitra, in the fourth quarter of 2026. Two further uncrewed flights in the configuration of the first crewed flight are targeted by 2027.

DD India’s report of a written Lok Sabha reply of 29 July 2026 says all three stages of the human-rated LVM3 launch vehicle and the escape motors are ready, assembly and testing of the two modules are nearing completion, and integrated mission simulations are under way.

Narayanan spoke at the graduation ceremony of the Sri Ramachandra Centre for Higher Education and Research in Chennai, according to India Strategic. The report says the flight will use the human-rated LVM3 from Sriharikota and carry Vyommitra. NewsHouse, citing the UNI wire, dates the remarks to 24 October.

The chairman’s two-month remark is a statement to reporters, and the government’s formal target remains the fourth quarter. As of 5 November 2026 the pages consulted give no launch date for G1. The remarks of other officials, and earlier shifts in the G1 target, are set out in the Gaganyaan test flights article. The astronauts who will fly the crewed missions are profiled in our piece on Gaganyaan’s astronauts, and the programme’s place in India’s space record is in ISRO, the frugal space power.

ISRO’s release ends on the same point: G1 is the next Gaganyaan flight and is targeted for launch in 2026.