What do two PSLV mission failures in a row mean for ISRO?
UPSC Study Note: Two Consecutive PSLV Mission Failures — ISRO's "Workhorse" Under Scrutiny
1. At a Glance
- PSLV (Polar Satellite Launch Vehicle) is ISRO's most reliable launch vehicle — dubbed the "workhorse" of India's space programme — with only 3 failures in its first 62 missions before 2025. [S1][S2]
- Two consecutive third-stage failures (PSLV-C61, May 2025; PSLV-C62, January 2026) mark an unprecedented back-to-back breakdown in PSLV's operational history. [S1][S2][S3]
- UPSC relevance: Space technology (GS-III), science & technology infrastructure, institutional accountability, and India's strategic space ambitions.
- The episode raises questions about quality control, FAC (Failure Analysis Committee) effectiveness, and the pace of ISRO's corrective-action implementation.
2. Why in the News
- 18 May 2025: PSLV-C61 carrying EOS-09 (Earth Observation Satellite-09) failed due to a sudden pressure drop in the PS3 (third-stage solid motor) at approximately 203 seconds into flight. [S3]
- 12 January 2026: PSLV-C62 carrying EOS-N1 and 15 co-passenger satellites also failed — an anomaly in roll-rate disturbance near the end of PS3 burn caused a flight-path deviation. [S2][S3]
- ISRO Chairman V. Narayanan publicly confirmed the C62 failure and the PS3 anomaly. [S3]
- A Failure Analysis Committee (FAC) report from C61 was submitted to the Prime Minister's Office but has not been released publicly — raising transparency concerns. [S3]
3. Background & Evolution
| Year | Milestone |
|---|---|
| 1993 | PSLV's first flight (PSLV-D1) — partial failure; satellite not placed in intended orbit |
| 1994 | PSLV-D2 — first successful flight |
| 1996 | Operational status achieved with PSLV-C2 |
| 1999–2001 | Began carrying international payloads (co-passenger model) |
| 2008 | Chandrayaan-1 launched on PSLV-C11 |
| 2013 | Mars Orbiter Mission (Mangalyaan) on PSLV-C25 |
| 2017 | Record: 104 satellites in one launch (PSLV-C37) |
| 2019 | RISAT-2BR1, Cartosat-3 series deepen Earth-observation portfolio |
| May 2025 | PSLV-C61 failure — first PSLV failure in many years |
| Jan 2026 | PSLV-C62 failure — second consecutive, both in PS3 |
- Predecessors: SLV (Satellite Launch Vehicle) and ASLV (Augmented SLV) — both retired. PSLV replaced them as the primary workhorse; GSLV/LVM3 handles heavier GTO missions.
4. Core Static Facts
PSLV Configuration: - Stages: 4 alternating stages — PS1 (solid), PS2 (liquid, Vikas engine), PS3 (solid), PS4 (liquid) - Variants: PSLV-G (standard), PSLV-CA (core-alone, no strap-ons), PSLV-XL (6 extended strap-ons), PSLV-DL, PSLV-QL - Lift capacity (SSO): ~1,750 kg (XL variant); ~1,100 kg (CA variant) - Launch site: Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota, Andhra Pradesh - Implementing agency: ISRO under the Department of Space, directly under the Prime Minister's Office - ISRO Chairman (as of the failures): V. Narayanan - Enabling legislation: Space Activities Act is pending; ISRO operates under Government of India executive orders; Department of Space established by Cabinet Secretariat resolution, 1972 - PS3 (third stage): Solid-propellant motor — once ignited, cannot be throttled or shut down; hence structural failures are catastrophic - EOS series: Earth Observation Satellites for reconnaissance, agriculture, disaster management, urban planning
Mission Specifics:
| Mission | Date | Payload | Failure Mode |
|---|---|---|---|
| PSLV-C61 | 18 May 2025 | EOS-09 | Chamber pressure drop in PS3 at ~203 s |
| PSLV-C62 | 12 Jan 2026 | EOS-N1 + 15 co-passengers | Elevated roll-rate disturbance in PS3, flight-path deviation |
5. Multi-Dimensional Analysis
Scientific / Technological
- PS3 is a solid motor — its propellant (HTPB-based composite) is cast as a single grain; any void, crack, or delamination can cause a casing breach or nozzle blowout, leading to catastrophic pressure loss. [S3]
- The fact that two successive failures both localised in PS3 suggests either a manufacturing process defect (batch-level issue in propellant casting or casing) or a design vulnerability in the upgraded PS3 configuration.
- A solid-motor failure cannot be arrested mid-burn — making pre-launch Non-Destructive Evaluation (NDE) and quality control the only viable intervention points.
- The FAC's classified findings (submitted to PMO post-C61) were apparently insufficient to prevent a repeat — suggesting either the root cause was misdiagnosed or corrective steps were not fully implemented before C62 launch. [S3]
Strategic / Geopolitical
- PSLV is India's primary vehicle for commercial launches via NewSpace India Limited (NSIL) — two failures damage ISRO's and India's commercial credibility in the global launch market.
- EOS-09 was likely a dual-use reconnaissance satellite (analogous to RISAT series); its loss has implications for defence and border surveillance capabilities.
- Competitors — SpaceX (Falcon 9), Arianespace, JAXA, CNSA — benefit from India's temporary vulnerability in the small-satellite launch market.
- India's Gaganyaan human spaceflight programme depends on demonstrated launch reliability; back-to-back PSLV failures cast indirect doubt on institutional quality systems.
Economic
- Commercial co-passenger missions (15 satellites on C62) generate foreign exchange revenue; mission failure means loss of income and potential contract liability.
- Satellite insurance costs for ISRO missions may rise after two consecutive failures.
- Both EOS missions represent significant national investment in Earth observation infrastructure for agriculture, disaster response, and urban planning — these capabilities are now delayed.
Governance / Administrative
- Non-release of the FAC report from C61 is a transparency issue — ISRO has historically been forthcoming on technical failures (e.g., post-GSAT-6A, post-Chandrayaan-2 lander). [S3]
- The report being submitted to the PMO signals high-level political sensitivity around payload classification, but redacted technical sections could have been released publicly.
- Failure Analysis Committees are ISRO's standard accountability mechanism — their independence and timelines need external scrutiny.
- The two failures raise questions about launch cadence pressure: ISRO has been accelerating its mission schedule, and compressed timelines can compromise quality checks.
Ethical
- Withholding the C61 FAC report, even in redacted form, limits public and scientific community accountability — especially given ISRO's public-funded mandate.
- Dual-use satellite classification cannot indefinitely justify opacity on rocket-system failures, particularly when the same failure mode recurs.
6. Recent Developments (Last 12–18 Months)
- 18 May 2025: PSLV-C61 fails; EOS-09 lost; PS3 chamber pressure anomaly at ~203 seconds. ISRO forms FAC. [S1][S3]
- May–December 2025: FAC investigates; report submitted to PMO; not publicly released. [S3]
- 12 January 2026: PSLV-C62 (ISRO's first 2026 mission) fails; EOS-N1 + 15 co-passenger satellites lost; PS3 roll-disturbance anomaly confirmed by Chairman V. Narayanan. [S2][S3]
- 13 January 2026: The Hindu reports on implications of two consecutive PSLV failures; questions raised about corrective-action adequacy. [S3]
- A new Failure Analysis Committee is expected to be constituted for C62.
7. Prelims Hooks
- PSLV's third stage (PS3) uses solid propellant — it cannot be throttled or shut down once ignited.
- PSLV-C61 failed on 18 May 2025; primary payload was EOS-09.
- PSLV-C62 failed on 12 January 2026; primary payload was EOS-N1, co-carrying 15 satellites.
- Both C61 and C62 failures were localised in the PS3 (third stage).
- ISRO Chairman V. Narayanan confirmed the PSLV-C62 failure publicly.
- PSLV had recorded only 3 failures in its first 62 launches before the 2025–26 back-to-back failures.
- The Failure Analysis Committee (FAC) report for C61 was submitted to the Prime Minister's Office but remains unreleased as of January 2026.
- PSLV is launched from Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota, Andhra Pradesh.
- Department of Space (not Ministry of Space) is the nodal body for ISRO; it reports directly to the Prime Minister.
- PSLV has 4 stages: alternating solid (PS1, PS3) and liquid (PS2, PS4) motors.
- PSLV-XL variant carries 6 strap-on boosters and is the heaviest PSLV configuration.
- Commercial launches via PSLV are handled by NewSpace India Limited (NSIL), not ISRO directly.
- EOS-09 was the primary payload of the failed C61 mission — part of India's Earth Observation Satellite series used for dual-use reconnaissance and civilian mapping.
- The C61 PS3 pressure drop occurred at approximately 203 seconds into flight.
- A solid-motor anomaly may indicate casing breach, nozzle blowout, or propellant casting defect — all pre-launch quality-control failures.
8. Mains Relevance
GS Paper mapping:
| Paper | Syllabus Heading |
|---|---|
| GS-III | Science & Technology — space, indigenisation, R&D, strategic applications |
| GS-III | Internal Security — dual-use satellite capability, defence surveillance |
| GS-II | Governance — accountability of autonomous scientific institutions, transparency |
Plausible Mains Questions: 1. "Two consecutive failures of PSLV raise questions not merely about technology but about ISRO's institutional quality culture. Discuss." (GS-III, 250 words) 2. "Evaluate the strategic implications of consecutive PSLV failures for India's commercial space ambitions and security satellite programme." (GS-III, 250 words) 3. "The non-disclosure of the Failure Analysis Committee report on PSLV-C61 highlights a tension between national security and public accountability in space governance. Analyse." (GS-II/GS-IV, 150 words)
9. Related Topics to Study Next
| Topic | Connection |
|---|---|
| ISRO's launch vehicle family (PSLV, GSLV, LVM3, SSLV) | Understand the full vehicle portfolio — PSLV failure puts pressure on GSLV/LVM3 and SSLV timelines |
| India's Space Policy 2023 | The policy opened private sector participation — PSLV failures affect investor confidence in this framework |
| NewSpace India Limited (NSIL) | NSIL is the commercial arm using PSLV for launches; failures directly impact its revenue and contracts |
| Gaganyaan Human Spaceflight Programme | Depends on institutional reliability standards that PSLV failures call into question |
| EOS/RISAT satellite series | Understanding India's Earth Observation architecture helps frame the strategic cost of these losses |
| India's Space Activities Bill (draft) | Regulatory framework for accountability, liability, and private sector — failures make the bill's passage more urgent |
| SSLV (Small Satellite Launch Vehicle) | SSLV had its own early failure (SSLV-D1, 2022) and recovery; relevant comparator for ISRO's failure-response pattern |
10. Common Errors / Trap Areas
- PS3 is solid, not liquid — many aspirants confuse PSLV's alternating stage structure. PS2 and PS4 are liquid; PS1 and PS3 are solid. The failure was in the solid PS3, not a liquid engine.
- Department of Space ≠ Ministry of Space — there is no "Ministry of Space." ISRO reports to the Department of Space, which is under the Prime Minister's Office, not DSIR or DST.
- NSIL vs ANTRIX — ANTRIX Corporation is ISRO's older commercial arm (now under scrutiny for past deals); NSIL is the current vehicle for commercial launches. Do not conflate them.
- FAC submitted to PMO ≠ approved by PMO — the FAC report is a technical investigation, not a policy decision. Its submission to PMO reflects payload sensitivity, not a "government cover-up" (avoid over-extrapolating).
- C62 ≠ ISRO's 62nd PSLV launch — "C62" is a mission designation code, not a sequential count. PSLV had well over 62 launches by 2026.
11. Sources
- [S1] "ISRO's PSLV-C61 Mission Fails As Third-Stage Anomaly Derails EOS-09 Satellite Launch" — https://www.oneindia.com/india/isros-pslv-c61-mission-fails-as-third-stage-anomaly-derails-eos-09-satellite-launch-4156519.html — (Tier 4 equivalent / news)
- [S2] "PSLV-C62 Anomaly — ISRO Investigates Roll Disturbance During Third Stage" — https://www.newsonair.gov.in/pslv-c62-anomaly-isro-investigates-roll-disturbance-during-third-stage-of-eos-n1-mission-says-chairman-dr-v-narayanan/ — (Tier 1: newsonair.gov.in / government broadcaster)
- [S3] "What do two PSLV mission failures in a row mean for ISRO?" — The Hindu, 13 January 2026, by Vasudevan Mukunth — Article content provided as primary source — (Tier 4)
- [S4] "ISRO Forms Probe Panel After PSLV-C61 Glitch Leaves EOS-09 Off Target" — https://www.newsonair.gov.in/isro-forms-probe-panel-after-pslv-c61-glitch-leaves-eos-09-off-target — (Tier 1: newsonair.gov.in)
- [S5] "Decoding the failure of PSLV C62 mission" — The Week, 13 January 2026 — https://www.theweek.in/news/sci-tech/2026/01/13/explainer-failure-of-pslv-c62-mission.html — (Tier 4)
Note: WebFetch was disabled per retrieval budget constraints. Facts above are grounded in search-result snippets (S1–S5) and the supplied article content (S3). ISRO.gov.in and pib.gov.in search queries did not return direct results for these missions in this retrieval session; Tier 1 coverage is partially met via newsonair.gov.in (government of India broadcaster). All facts cross-referenced between article content and search snippets for consistency.
