PSLV-C62 Stumbles at the Third Stage: What Went Wrong in India’s First Space Launch of 2026

A Repeating Failure Mode: Echoes of PSLV-C61

The anomaly has heightened concern because it mirrors the failure of PSLV-C61 in May 2025, which also suffered a problem in the third stage while attempting to deploy the EOS-09 satellite. ISRO officials have previously indicated that the C61 failure involved an unexpected drop in chamber pressure in the solid-fuel PS3 motor, potentially linked to issues such as flex nozzle behaviour, propellant integrity, or motor casing performance.

With PSLV-C62, telemetry again indicated a disturbance during the coasting phase of PS3, followed by loss of trajectory control. While ISRO has not yet disclosed whether the root cause is identical, the recurrence within eight months has placed the PS3 solid motor under particular scrutiny.

This marks the first time in PSLV’s three-decade operational history that the vehicle has failed on two consecutive missions. Prior to 2025, PSLV had recorded only two major failures—its inaugural flight in 1993 and a navigation satellite mission in 2017—out of more than 60 launches, giving it a long-standing reputation as ISRO’s most reliable “workhorse.”

Why the PS3 Stage Is a Single-Point-of-Failure Risk

The recurrence of anomalies during the PS3 stage highlights a structural vulnerability rather than a coincidence. PS3 is a solid-fuel motor operating at a high-stress transition point in the PSLV flight profile. Unlike liquid stages, solid motors cannot be throttled, shut down, or restarted once ignited. Any instability in chamber pressure, nozzle flex, or thrust vector alignment must be absorbed by guidance corrections alone—and the margin for recovery at this stage is extremely narrow.

Compounding the risk, PS3 sits between two guidance-critical phases: the completion of ascent energy and the handover to the upper stage responsible for orbital insertion. A deviation here cannot be “corrected later,” even if downstream systems are nominal. In practical terms, PS3 anomalies propagate irreversibly, turning what might appear to be a small disturbance into a mission-ending failure.

This architecture explains why both PSLV-C61 and PSLV-C62 progressed smoothly through earlier stages before suffering total mission loss. The issue is not overall vehicle fragility, but concentration of unrecoverable risk in a single stage—a design reality that places extraordinary importance on PS3 manufacturing quality, acceptance testing, and ageing analysis.

Implications for Commercial Launches and the Private Space Ecosystem

The PSLV-C62 mission was the ninth dedicated commercial launch undertaken through NewSpace India Limited (NSIL), ISRO’s commercial arm. It was also emblematic of India’s push to integrate private startups and academic institutions into launch campaigns, with payloads spanning Earth observation, IoT communication, in-orbit technology demonstrations, and re-entry experiments.

Back-to-back PSLV failures risk denting international customer confidence in India’s rideshare launch offerings, particularly as global competition intensifies from private launch providers offering rapid turnaround and high launch cadence. Several reports note that commercial payload aggregation, pricing credibility, and insurance costs could all be affected if the PS3 issue is not resolved swiftly and transparently.

The Quiet Cost of Consecutive Failures

In commercial launch markets, the consequences of failure are often felt off the launch manifest rather than on it. Consecutive anomalies typically trigger a reassessment by insurers, underwriters, and payload aggregators. Premiums rise, indemnity clauses tighten, and customers demand more conservative mission architectures—such as reduced rideshare density or additional pre-flight guarantees.

For small-sat startups operating on narrow margins, even modest increases in insurance costs can alter project viability. Universities and early-stage companies, which form a growing share of PSLV’s rideshare clientele, are particularly sensitive to these shifts. The reputational impact may therefore materialise not as cancellations, but as slower deal closure and more cautious customer behaviour.

Even if PSLV returns to flight swiftly, restoring commercial momentum will require demonstrated reliability over multiple missions, not just a single successful rebound.

What This Means for ISRO’s 2026 Calendar

The failure casts uncertainty over ISRO’s 2026 launch schedule, which includes high-priority missions such as:

• Uncrewed test flights for Gaganyaan, India’s human spaceflight programme
• Expansion of NavIC navigation satellites
• Continued commercial and small-satellite launches
• The first industry-built PSLV missions under ISRO’s privatisation roadmap

While ISRO officials have emphasised the organisation’s historical ability to recover quickly from setbacks, the grounding of the PSLV pending investigation may force rescheduling or substitution with heavier launch vehicles such as LVM3 for select missions.

What “Industry-Built PSLV” Must Now Prove

The timing of the PSLV-C62 failure intersects uncomfortably with ISRO’s push to transfer PSLV production and integration to Indian industry under a consortium-led model. This transition is central to India’s plan to scale launch frequency, reduce agency bottlenecks, and build a commercially viable space-industrial base.

Back-to-back PS3 failures now raise a certification challenge: what constitutes “flight-proven” reliability when production authority is being decentralised? Solid motors, in particular, are sensitive to batch consistency, curing processes, material ageing, and non-destructive evaluation standards. Even minor variations can produce large performance deviations under flight loads.

Before PSLV can fully transition from an agency-built system to an industry-built one, ISRO will likely need to tighten acceptance protocols, re-qualify critical components, and potentially slow production ramp-up. This does not derail privatisation—but it reframes it. Industrialisation is no longer just about throughput; it is about demonstrating that quality assurance scales as reliably as manufacturing capacity.

Putting the Failure Rate in Perspective

While two consecutive failures are rare for PSLV, perspective matters. Launch vehicles in the same medium-lift, small-sat class globally have experienced comparable reliability stress during periods of evolution or scaling.

The European Vega launcher suffered four failures or partial failures between 2019 and 2022, leading to a prolonged grounding. Japan’s Epsilon failed on its sixth flight in 2022 after a previously strong record. Even SpaceX’s Falcon 9, now considered the gold standard for reliability, experienced multiple failures in its early operational years before achieving maturity. Newer small-sat launchers such as Virgin Orbit’s LauncherOne failed on multiple occasions before the programme was eventually discontinued.

Against this backdrop, PSLV’s historical success rate—over 94% across more than 60 missions—remains strong by international standards. What makes the current episode significant is not absolute failure frequency, but failure clustering in the same subsystem. How ISRO diagnoses, fixes, and transparently communicates that subsystem risk will determine whether PSLV’s reputation remains intact—or enters a longer credibility repair cycle.

Why This Matters

PSLV’s reliability has been central to India’s reputation as a cost-effective, dependable launch provider and as a backbone for national science, defence, and commercial space objectives. Two consecutive failures—both linked to the same stage—shift the narrative from isolated anomaly to systemic reliability challenge, at a time when India is seeking to scale up launch frequency and deepen private-sector participation.

How quickly ISRO identifies the root cause, communicates its findings, and restores confidence in the PSLV platform will shape not just the remainder of the 2026 calendar, but also India’s standing in the increasingly competitive global space launch market.