Recent PSLV failures have raised questions about India's launch vehicle reliability. Examine the technical and strategic implications for ISRO's international partnerships.

The PSLV, ISRO's workhorse with a long record of commercial launches, has suffered two consecutive failures — PSLV-C61 (May 2025, EOS-09) and PSLV-C62 (January 2026, EOS-N1 with 14 co-passengers) [1][2]. Both anomalies occurred in the third stage, making reliability, rather than capability, the central question for India's space partnerships.

Technical implications

• Recurring third-stage vulnerability: C61 saw a fall in chamber pressure in the solid third-stage motor; C62 saw a higher roll-rate disturbance and flight-path deviation [1][2]. A repeat failure in the same stage points to a systemic issue in the PS3 segment, not random chance.
• Quality assurance and review: ISRO constituted a Failure Analysis Committee after C61 [1], yet a second loss within months suggests corrective action must extend to design margins, batch-level propellant checks and instrumentation.
• Payload and schedule cost: loss of Earth-observation assets and commercial co-passengers disrupts the EOS series and crowds an already dense manifest.

Strategic implications for partnerships

• Confidence, largely retained: France's CNES has publicly reaffirmed trust in ISRO and in the PSLV as launcher for the joint TRISHNA thermal-infrared mission, planned for 2027 [3][6] — evidence that a long partnership is judged on cumulative record, not two flights.
• Institutional depth cushions setbacks: ISRO–CNES cooperation, spanning Megha-Tropiques and SARAL-AltiKa, and the India–France Joint Statement's commitment to deeper space-industry collaboration and sovereign access to space, give the relationship strategic ballast [4][5].
• Commercial exposure: for newer customers routed through NSIL/IN-SPACe, insurance costs and slot confidence are more fragile than for treaty-level partners.

Reliability is thus a manageable technical problem set against a resilient diplomatic base. A transparent failure-analysis regime, independent design review of the third stage and a successful demonstration flight before TRISHNA would convert this setback into strengthened credibility — sustaining India's role as a trusted partner in global climate and Earth-observation science.