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The Indian Space Research Organisation (ISRO) has achieved another crucial milestone towards the success of the Gaganyaan mission. On December 18 and 19, 2025, ISRO successfully carried out qualification tests of drogue parachutes at the Rail Track Rocket Sled (RTRS) facility of the Terminal Ballistics Research Laboratory (TBRL) in Chandigarh.
These tests were conducted to validate the deceleration system of the Gaganyaan Crew Module, which plays a vital role in ensuring the safe return of astronauts to Earth.
Why these tests are significant
According to ISRO, the primary objective of the tests was to closely evaluate the performance and reliability of drogue parachutes under extreme and off-nominal conditions. The results confirmed that the parachutes functioned exactly as designed, even when flight conditions varied significantly.
ISRO said both trials met all mission objectives, reinforcing confidence in the system’s robustness and readiness for actual human spaceflight conditions. The effort involved close collaboration with Vikram Sarabhai Space Centre, the Aerial Delivery Research and Development Establishment (ADRDE), and DRDO.
Space science on railway tracks
At first glance, railway tracks are associated only with trains. However, ISRO has used these tracks for some of the most demanding spaceflight tests. The RTRS facility enables a rocket sled to move at extremely high speeds, recreating conditions similar to those encountered during atmospheric re-entry.
One of the toughest challenges in the Gaganyaan mission is the safe recovery of astronauts. When the Crew Module re-enters Earth’s atmosphere, it travels at very high speed. Controlling and reducing this speed is critical—this is where drogue parachutes play a decisive role.
These parachutes stabilise the module and reduce its velocity to a level where the main parachutes can be safely deployed.
A 10-parachute safety architecture
The Gaganyaan Crew Module’s deceleration system consists of a complex network of 10 parachutes, divided into four distinct types, designed to work in a precise sequence:
- Two Apex Cover Separation parachutes remove the protective cover of the parachute compartment
- Two Drogue parachutes provide initial stabilisation and speed reduction
- Three Pilot parachutes are then deployed
- These finally extract three Main parachutes, which ensure a controlled descent and safe landing on land or sea
This layered system ensures redundancy and maximum safety for astronauts.
A strong step towards human spaceflight
The successful completion of these tests is a major step in qualifying the parachute system for human spaceflight. The use of the Rail Track Rocket Sled highlights ISRO’s engineering ingenuity, allowing engineers to simulate real flight conditions on Earth with high accuracy.
ISRO officials said the tests underline India’s commitment to not compromising on astronaut safety, even as the country prepares for its first-ever crewed space mission.
India’s readiness for Gaganyaan
With every such successful test, ISRO is steadily building confidence in the systems that will carry Indian astronauts to space and bring them back safely. The drogue parachute trials demonstrate that India is technically prepared and moving methodically towards achieving human spaceflight capability.
What may look like a railway experiment is, in fact, a cornerstone of India’s space ambitions. By successfully testing Gaganyaan’s drogue parachutes on high-speed rail tracks, ISRO has taken another decisive step towards ensuring that India’s first astronauts return home safely—making the railway–space connection not just logical, but mission-critical.
