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

• 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:

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

1. PSLV's third stage (PS3) uses solid propellant — it cannot be throttled or shut down once ignited.
2. PSLV-C61 failed on 18 May 2025; primary payload was EOS-09.
3. PSLV-C62 failed on 12 January 2026; primary payload was EOS-N1, co-carrying 15 satellites.
4. Both C61 and C62 failures were localised in the PS3 (third stage).
5. ISRO Chairman V. Narayanan confirmed the PSLV-C62 failure publicly.
6. PSLV had recorded only 3 failures in its first 62 launches before the 2025–26 back-to-back failures.
7. The Failure Analysis Committee (FAC) report for C61 was submitted to the Prime Minister's Office but remains unreleased as of January 2026.
8. PSLV is launched from Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota, Andhra Pradesh.
9. Department of Space (not Ministry of Space) is the nodal body for ISRO; it reports directly to the Prime Minister.
10. PSLV has 4 stages: alternating solid (PS1, PS3) and liquid (PS2, PS4) motors.
11. PSLV-XL variant carries 6 strap-on boosters and is the heaviest PSLV configuration.
12. Commercial launches via PSLV are handled by NewSpace India Limited (NSIL), not ISRO directly.
13. 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.
14. The C61 PS3 pressure drop occurred at approximately 203 seconds into flight.
15. 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:

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

10. Common Errors / Trap Areas

1. 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.
2. 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.
3. 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.
4. 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).
5. 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.