Following the failure of the PSLV-C62 mission, here’s a quiz remembering the storied history of ISRO’s PSLV rocket

ISRO's PSLV Rocket — UPSC Prelims + Mains Study Note

1. At a Glance

• PSLV (Polar Satellite Launch Vehicle) is India's most reliable operational rocket, designed primarily to place satellites in Sun-Synchronous Polar Orbits (SSPO) and Low Earth Orbits (LEO). [S1]
• It has become ISRO's workhorse launch vehicle, responsible for the bulk of India's remote-sensing, navigation, and international commercial satellite launches. [S1]
• UPSC relevance: touches GS-III (Science & Technology, Space), India's strategic autonomy in space, commercial space policy, and technology transfer diplomacy.
• PSLV-C62 mission failure (2026) has revived scrutiny of PSLV's reliability track record and ISRO's quality-control systems.

2. Why in the News

• PSLV-C62 mission failure (January 2026): The rocket failed during its mission, marking a rare setback for the PSLV programme, which had maintained an enviable success rate. [S4]
• The failure prompted retrospectives on PSLV's history, including a quiz published in The Hindu (15 January 2026) covering technical and historical milestones. [S4]
• Coincides with heightened focus on India's commercial space sector under the Indian Space Policy 2023 and the opening of launch-vehicle manufacturing to private players.

3. Background & Evolution

4. Core Static Facts

Vehicle Architecture (4-stage alternating solid-liquid design)

• PS1 (Stage 1): Solid propellant — S138 solid motor (138-tonne propellant load); largest solid booster in ISRO inventory [S1]
• PS2 (Stage 2): Liquid — powered by Vikas engine (derived from French Viking engine via 1974 technology deal) [S1][S4]
• PS3 (Stage 3): Solid
• PS4 (Stage 4): Liquid — can be repurposed as POEM (PS4 Orbital Experiment Module) [S1]

Steering Mechanism

• First stage does not use thrust-vector control via nozzle gimballing.
• Instead uses Secondary Injection Thrust Vector Control (SITVC): injects a chemical (strontium perchlorate solution) into one side of the exhaust nozzle to create asymmetric thrust. [S4]

POEM (PS4 Orbital Experiment Module)

• Repurposed spent 4th stage of PSLV used as a stabilised orbital platform.
• Hosts student payloads and scientific microgravity experiments for up to ~3 months. [S1]
• POEM-1: PSLV-C53 (2022); POEM-4: PSLV-C60/SpaDeX (Dec 2024). [S1]

Variants

Key Administrative Facts

• Implementing body: Indian Space Research Organisation (ISRO)
• Parent ministry: Department of Space (DoS), under Prime Minister's Office (PMO)
• Launch sites: Satish Dhawan Space Centre (SDSC), Sriharikota, Andhra Pradesh — First Launch Pad (FLP) and Second Launch Pad (SLP)
• PSLV-C37 payload total: 1,378 kg across 104 satellites [S2][S3]
• PSLV-C37 co-passenger satellites: 96 from USA, and 1 each from Netherlands, Switzerland, Israel, Kazakhstan, UAE [S2]

5. Multi-Dimensional Analysis

Scientific / Technological

• PSLV's alternating solid-liquid stage design provides high reliability and flexibility unavailable in purely solid rockets. [S1]
• The Vikas engine (based on Viking) is now the baseline liquid engine for GSLV and Gaganyaan's L110 stage as well — demonstrating technology genealogy across programmes. [S1]
• SITVC (Secondary Injection Thrust Vector Control) eliminates the mechanical complexity of gimbal systems on large solid motors, reducing failure points. [S4]
• POEM converts orbital debris (spent upper stage) into an asset — a model for sustainable space operations aligned with UN guidelines on space debris. [S1]

Geopolitical / Strategic

• The 1974 technology-for-labour barter deal with France (Viking engine → Vikas engine) is a case study in India's early technology diplomacy under MTCR constraints.
• PSLV's commercial success through Antrix Corporation (later NewSpace India Limited / NSIL) has launched satellites for over 30 countries, enhancing India's soft power.
• PSLV-C37's 104-satellite launch (February 2017) demonstrated multi-payload deployment capabilities with direct commercial and strategic signalling value.

Economic

• PSLV is central to India's commercial launch market earnings; NSIL markets PSLV slots internationally.
• Under Indian Space Policy 2023, private sector entities (IN-SPACe framework) can now access PSLV launch slots, broadening the economic ecosystem.
• PSLV-C62 failure creates short-term revenue and scheduling setbacks for customer satellites.

Environmental / Sustainability

• POEM directly addresses the space debris problem by extending useful life of the 4th stage rather than leaving it as uncontrolled orbital debris. [S1]
• Post-PSLV-C37, the upper stage re-entered Earth's atmosphere on 6 October 2024 — tracked and confirmed by ISRO. [S1]

Administrative / Governance

• PSLV missions are managed end-to-end at SDSC-SHAR, Sriharikota (launch) and ISTRAC (ISRO Telemetry, Tracking and Command Network) for mission control.
• PSLV-C62 failure will trigger a Failure Analysis Committee (FAC), standard ISRO practice before resuming the launch series.

6. Recent Developments (last 12–18 months)

• December 2024: PSLV-C60 / SpaDeX (Space Docking Experiment) mission launched; carried POEM-4 with multiple student and scientific payloads. [S1]
• October 2024: Upper stage of PSLV-C37 (which launched 104 satellites in 2017) re-entered Earth's atmosphere, tracked by ISRO — a natural end to a 7-year orbital life. [S1]
• January 2026: PSLV-C62 mission fails — rare failure; triggers Failure Analysis Committee; quiz in The Hindu (15 Jan 2026) commemorates PSLV's history. [S4]
• Ongoing (2025–26): Vikas engine continues qualification testing for Gaganyaan (human spaceflight) L110 stage — throttling demonstrated at 67% thrust level. [S1]

7. Prelims Hooks

1. PSLV stands for: Polar Satellite Launch Vehicle — designed primarily for Sun-Synchronous Polar Orbit payloads. [S1]
2. First successful PSLV flight: PSLV-D2, October 1994 (D1 in 1993 failed). [S1]
3. PSLV-C37 (February 2017) launched 104 satellites in a single flight — world record at the time. [S2][S3]
4. Total payload mass of PSLV-C37's 104 satellites: 1,378 kg. [S2]
5. SpaceX Transporter-1 broke the 104-satellite record in 2021, launching 143 satellites. [S4]
6. Vikas engine (PSLV's liquid 2nd stage) is derived from France's Viking engine, acquired in 1974 via barter — 100 man-years of engineering + work on Ariane rocket + pressure transducers. [S4]
7. SITVC: PSLV's first stage steers not by gimballing but by Secondary Injection Thrust Vector Control — injecting strontium perchlorate solution into exhaust nozzle. [S4]
8. POEM = PS4 Orbital Experiment Module — repurposed spent 4th stage of PSLV used as an orbital microgravity platform for up to ~3 months. [S1]
9. POEM-4 flew on PSLV-C60 / SpaDeX mission, December 2024. [S1]
10. Between SLV and PSLV, ISRO operated the ASLV (Augmented Satellite Launch Vehicle) programme for approximately 7 years (1987–1994). [S4]
11. PSLV's 1st stage solid motor designation: S138 (138-tonne propellant). [S1]
12. PSLV launch site: First Launch Pad (FLP) and Second Launch Pad (SLP) at SDSC-SHAR, Sriharikota, Andhra Pradesh. [S1]
13. Chandrayaan-1 was launched by PSLV-C11 (October 2008); Mangalyaan (MOM) by PSLV-C25 (November 2013). [S1]
14. Commercial arm marketing PSLV internationally: previously Antrix Corporation, now NewSpace India Limited (NSIL). [S1]
15. PSLV variants: PSLV-G (6 strap-ons), PSLV-CA (no strap-ons), PSLV-XL (6 larger strap-ons, heaviest variant), PSLV-DL (2), PSLV-QL (4). [S1]

8. Mains Relevance

GS Paper mapping: - GS-III: Science & Technology — Space Technology; Indigenous Technology Development; Achievements of Indians in S&T.

Specific syllabus headings: - "Awareness in the fields of IT, Space, Computers, robotics, nano-technology, bio-technology." - "Indigenization of technology and developing new technology."

Plausible Mains question stems: 1. "Discuss the evolution of India's satellite launch vehicle programme from SLV to PSLV. How has PSLV contributed to India's strategic and commercial space ambitions?" (GS-III, 250 words) 2. "The PSLV-C37 mission that launched 104 satellites was a watershed moment for India's commercial space sector. Critically examine the challenges and opportunities India faces in the global commercial launch market." (GS-III, 150 words) 3. "How has ISRO's approach to space sustainability, as reflected in initiatives like POEM, aligned with international guidelines on space debris mitigation?" (GS-III, 150 words)

9. Related Topics to Study Next

10. Common Errors / Trap Areas

1. PSLV vs GSLV confusion: PSLV is for polar/sun-synchronous orbits; GSLV targets Geostationary Transfer Orbit (GTO). PSLV cannot place heavy satellites in GTO — aspirants frequently mix these up.
2. "Vikas = Indian original" trap: Vikas is derived from France's Viking engine via a 1974 deal — it is not indigenously designed from scratch; however, subsequent improvements are Indian. [S4]
3. POEM is NOT a dedicated satellite: It is the repurposed 4th stage (PS4) of PSLV — not a separately built spacecraft. Confusing it with ISRO's nano-satellites (INS series) is a common error.
4. PSLV-C37 record year: The 104-satellite record was set in February 2017, not 2016 or 2018. The SpaceX Transporter-1 broke it in January 2021 (143 satellites) — aspirants may incorrectly credit a different SpaceX mission. [S4]
5. ASLV between SLV and PSLV: Many aspirants incorrectly jump from SLV-3 (1980) directly to PSLV, forgetting the ASLV intermediate programme (1987–1994) which attempted but largely failed to bridge the gap. [S4]

11. Sources

• [S1] PSLV Overview — https://www.isro.gov.in/PSLV_CON.html — (Tier 1: isro.gov.in)
• [S2] PIB Press Release: PSLV-C37 Successfully Launches 104 Satellites in a Single Flight — https://www.pib.gov.in/newsite/PrintRelease.aspx?relid=158472 — (Tier 1: pib.gov.in)
• [S3] ISRO: PSLV-C37 Successfully Launches 104 Satellites — https://www.isro.gov.in/SuccessfullyLaunches104.html — (Tier 1: isro.gov.in)
• [S4] The Hindu (15 January 2026), "Following the failure of the PSLV-C62 mission, here's a quiz remembering the storied history of ISRO's PSLV rocket" — Vasudevan Mukunth — Article content supplied in prompt — (Tier 4: thehindu.com)

Sources: - PSLV Overview — ISRO - PSLV-C37 Launch — PIB - PSLV-C37 104 Satellites — ISRO - POEM-4 / SpaDeX — ISRO