ISRO Faces Back-to-Back PSLV Rocket Failures With Third Stage Issues
January 12, 2026
On May 18, 2025, the PSLV-C61 mission by ISRO ended in failure, a rare event given the rocket’s history of success. The rocket failed in its third stage solid motor, which caused it to lose pressure and thrust. This failure caused the rocket and its heavy radar satellite EOS-09 to fall back to Earth.
Only eight months later, on January 12, 2026, PSLV-C62 also failed shortly after launch. ISRO confirmed an anomaly occurred in the third stage again. The rocket experienced a "roll rate disturbance," causing it to spin uncontrollably and deviate from its flight path. This was likely due to a gas leak or nozzle issue in the third stage, which the smaller top stage thrusters could not control.
Both satellites involved, EOS-09 and EOS-N1, are military-grade spy satellites, adding to the secrecy around failure details. ISRO has kept the full Failure Analysis Committee (FAC) reports confidential under orders from the Prime Minister’s Office. The reports point to possible quality control and material problems but do not fully explain the cause.
ISRO grounded all PSLV launches after the first failure and took months to reinforce the third stage design and improve quality checks. The back-to-back failures have hurt the reputation of the PSLV rocket, known as India's 'workhorse' for reliable launches.
ISRO Chairman V. Narayanan said investigations continue. The secrecy is also to avoid affecting commercial and military interests tied to these missions. Experts note that the similar problems in two launches suggest that the issues with the third stage motor remain unresolved.
ISRO now faces extra pressure to fix these problems and regain trust for future PSLV launches. The delays and cover-up have caused concern among space industry watchers. The exact technical and organizational causes will only be revealed when ISRO shares the full report publicly.
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Tags:
Isro
Pslv-C62
Pslv-c61
Rocket Failure
Eos-09
Space Launch
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