What Happened
- ISRO successfully conducted the Second Integrated Air Drop Test (IADT-02) for the Gaganyaan programme on April 10, 2026, validating the parachute deployment sequence for safe crew module re-entry.
- The test verified the multi-stage parachute system that will slow the crew module from supersonic speeds to a safe splashdown velocity in the Bay of Bengal.
- The Gaganyaan-1 uncrewed test flight (with humanoid robot Vyommitra) is scheduled for the second half of 2026; the first crewed mission is now planned for 2027.
- The re-entry challenge involves decelerating a capsule from orbital speeds (~28,000 km/h) to a safe landing speed using a combination of atmospheric drag, heat shielding, and parachute systems.
Static Topic Bridges
Gaganyaan Programme — India's Human Spaceflight Mission
Gaganyaan is India's first indigenous human spaceflight programme, approved by the Union Cabinet in 2018 with a budget of ₹9,023 crore. The mission aims to demonstrate India's capability to send Indian astronauts (called Gaganauts) to a low-earth orbit of 400 km for up to three days and bring them back safely. The spacecraft consists of two modules: the Crew Module (CM) — the habitable capsule with life support, navigation, and deceleration systems — and the Service Module (SM) that provides propulsion, power, and thermal regulation during the orbital phase. The vehicle is launched by the Human-Rated LVM3 (HLVM3), a modified version of ISRO's heavy-lift LVM3 rocket, from the Satish Dhawan Space Centre, Sriharikota.
- Mission: Low Earth Orbit at 400 km altitude, 3-day crew mission
- Spacecraft: Orbital Module = Crew Module + Service Module
- Launch vehicle: Human-Rated LVM3 (HLVM3) — modified LVM3 with crew escape system
- Launch site: Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota
- Gaganauts selected: 4 Indian Air Force pilots (Group Captain Prashanth Balakrishnan Nair, Angad Pratap, Ajit Krishnan, Shubhanshu Shukla)
- Budget: ₹9,023 crore
Connection to this news: The re-entry and recovery procedure being explained is the critical final phase of the Gaganyaan mission architecture — the safe return of the Crew Module after separation from the Service Module.
Re-entry Physics — Heat Shield and Atmospheric Braking
When the Gaganyaan Crew Module re-enters Earth's atmosphere, it is travelling at approximately 28,000 km/h. The friction with atmospheric molecules generates enormous heat — temperatures can exceed 3,000°C at the outer surface of the capsule. To protect astronauts from this heat, the Crew Module uses an ablative heat shield made of special composite material that slowly chars, melts, and ablates (burns away), carrying the heat energy away from the module. This keeps the interior temperature survivable. The process of using atmospheric friction to slow down the capsule before parachute deployment is called aerobraking. A precise re-entry corridor (angle of approach) must be maintained — too steep and the capsule burns up; too shallow and it skips off the atmosphere.
- Re-entry speed: ~28,000 km/h (orbital velocity)
- Heat shield material: Ablative carbon-phenolic composite
- Peak re-entry temperature (outer surface): over 3,000°C
- Re-entry corridor: narrow band of approximately 5–10 degrees
- After aerobraking, the capsule slows to ~200–300 m/s before parachute deployment
Connection to this news: ISRO's successful Integrated Air Drop Tests validate the parachute system that deploys after the heat shield performs its function during high-speed atmospheric re-entry.
Multi-Stage Parachute System and Splashdown Recovery
After the heat shield slows the capsule through atmospheric drag, the Gaganyaan Crew Module deploys a staged parachute sequence: small pilot chutes first deploy to stabilise the tumbling capsule; these then pull out drogue chutes that further reduce speed; finally, three large main parachutes blossom to slow descent to approximately 7–8 m/s for splashdown. The capsule is targeted to land in the Bay of Bengal, approximately 500 km off the coast of India. The Indian Navy has been trained and designated as the primary recovery agency, with ships and divers pre-positioned at the splashdown zone. Retrorockets are not used by Gaganyaan for final deceleration — parachutes alone manage the terminal phase (unlike the Russian Soyuz which uses retrorockets just before touchdown on land).
- Parachute deployment sequence: Pilot chutes → Drogue chutes → 3 Main parachutes
- Final descent speed at splashdown: approximately 7–8 m/s
- Splashdown zone: Bay of Bengal (~500 km off Indian coast)
- Recovery agency: Indian Navy (ships + divers + helicopters)
- IADT-02 was conducted on April 10, 2026 — second successful air-drop test
Connection to this news: The IADT tests specifically validate the multi-stage parachute sequence in real atmospheric conditions, providing critical data on deployment altitude, timing, and structural loads.
Key Facts & Data
- Gaganyaan budget: ₹9,023 crore (approved 2018)
- Target orbit: 400 km Low Earth Orbit (LEO)
- Mission duration: up to 3 days
- Gaganyaan-1 (uncrewed): scheduled H2 2026
- Gaganyaan-2 (crewed): planned 2027
- Second Integrated Air Drop Test (IADT-02): April 10, 2026
- Heat generated during re-entry: over 3,000°C on outer capsule surface
- Splashdown target: Bay of Bengal
- Recovery: Indian Navy
- India will become the 4th country (after USA, Russia, China) to conduct independent human spaceflight