The Indian Space Research Organisation (Isro) has successfully completed three major qualification tests for critical crew module systems of the Gaganyaan mission, marking another milestone in India’s preparations for its first human spaceflight.
Before launching the maiden crewed mission, Isro plans to carry out two uncrewed test flights. The first is expected by the end of this year or in 2027.
The latest qualification tests validated three critical systems related to crew safety — splashdown recovery, crew module-service module separation, and parachute deployment. The tests focused on mission phases beyond astronaut control, including keeping the crew module upright after landing in the sea, ensuring a clean separation from the service module before re-entry, and verifying the capsule’s ability to withstand the forces generated during parachute cover separation.
The three qualification tests completed were:
- Float Inflation Test for the Crew Module Uprighting System (CMUS)
- Umbilical Separation Test for the Crew Module-Service Module Connect and Disconnect System (CS-CDS)
- Crew Module Structure Qualification Test for Apex Cover Separation Loads
Splashdown recovery system validated
Maintaining the crew module in an upright position after splashdown is a critical safety requirement for astronaut recovery.
To achieve this, Isro has developed a cold gas-based uprighting system. During the qualification test, engineers evaluated the complete CMUS using a system-level setup. Stored high-pressure gas was released through control valves to inflate the flotation system.
According to Isro, the test successfully demonstrated that the primary flotation system met all functional and performance requirements for deployment after splashdown.
Clean separation from service module confirmed
The Crew Module-Service Module Connect and Disconnect System (CS-CDS) provides the electrical and hydro-pneumatic link between the crew module and the service module during the mission.
It enables electrical communication between the two modules while also supporting fluid transfer for the Environmental Control and Life Support System (ECLSS). The mechanism comprises two units — CSU-1 on the crew module and CSU-2 on the service module.
Isro said the qualification test successfully demonstrated the clean separation of CSU-2 while also validating the structural stability of the crew module panel and its interfaces during the separation event.
Crew module withstands parachute cover separation loads
The apex cover protects the parachutes and related subsystems throughout the mission. Before parachute deployment during re-entry, the cover is jettisoned at a predetermined altitude using pyrotechnically actuated thrusters.
To assess the crew module’s structural integrity during this phase, Isro used an instrumented test rig with a simulated crew module and associated systems. Engineers applied reaction loads equivalent to nearly 1.75 times the estimated operational loads at critical locations.
According to the space agency, the test successfully validated the crew module’s ability to withstand the forces generated during apex cover separation, an essential requirement for the safe deployment of the parachute system.
The successful completion of the three qualification tests marks another significant step towards India’s first human spaceflight by validating critical systems designed to ensure crew safety throughout the mission.
