PARLIAMENT QUESTION: PSLV AND SSLV PROGRAMMES

1. At a Glance

PSLV (Polar Satellite Launch Vehicle) and SSLV (Small Satellite Launch Vehicle) are ISRO's operational expendable launchers for sun-synchronous/low Earth orbits, central to India's space autonomy and the commercial space pivot [S2][S3].
Topic is examinable under GS-III (Science & Tech — Space) and ties into the 2020 Space Sector Reforms that opened launch services to NSIL and private industry [S5][S6].

Lok Sabha reply, 01 April 2026, Department of Space stated PSLV launches were deferred for purely technical reasons following the PSLV-C62 mission failure; a National Level Expert Committee has been set up to review the anomaly and recommend corrective actions [S1].
The same reply confirmed SSLV has completed development flights and been handed over to NSIL and industry for production and launch [S1].

PSLV: ISRO's workhorse, first successful flight 1994; four-stage vehicle alternating solid/liquid stages; flagship missions include Chandrayaan-1 (2008) and Mars Orbiter Mission (2013) [S2].
SSLV: Three-stage all-solid + Velocity Trimming Module; designed for 10–500 kg payloads to 500 km planar orbit, low-cost, launch-on-demand [S3].
SSLV development flights: SSLV-D1 (Aug 2022) — failed; SSLV-D2 (Feb 2023) — success; SSLV-D3/EOS-08 (16 Aug 2024) — success, completing the development project [S4].
Technology Transfer Agreement for SSLV signed 10 Sept 2025 between NSIL, ISRO, IN-SPACe and HAL at ISRO HQ, Bengaluru [S5].

Parent body: Indian Space Research Organisation (ISRO), under Department of Space, directly under the Prime Minister [S1].
Commercial arm: NewSpace India Limited (NSIL) — CPSE incorporated 2019, mandated for production of PSLV & SSLV via Indian industry and Technology Transfer [S6].
Regulator/promoter: IN-SPACe (Indian National Space Promotion and Authorization Centre) [S5].
PSLV variants: PSLV-G, PSLV-CA (Core Alone), PSLV-XL, PSLV-DL, PSLV-QL [S2].
SSLV payload capability: 10–500 kg to 500 km LEO [S3].
SSLV TTA industry partner: Hindustan Aeronautics Limited (HAL) selected as the production agency [S5].
NSIL technology transfers to date: ~78 agreements signed with Indian industries [S6 secondary search].

Scientific/Technological: PSLV anomaly under review by National Level Expert Committee; "return to flight" only after corrective actions implemented — a standard ISRO post-failure protocol [S1][S7].
Economic: SSLV transfer to HAL via NSIL operationalises the 2020 Space Sector Reforms, shifting ISRO from operator to R&D, enabling private-led commercial launches to capture share of the global small-satellite market [S5][S6].
Strategic/Geopolitical: PSLV's role is critical for Gaganyaan, NISAR (NASA-ISRO SAR) and climate/weather satellites — all flagged in the Parliament reply as continuing under respective project teams [S1].
Administrative/Governance: Three-tier post-reform architecture — ISRO (R&D) | IN-SPACe (authorisation) | NSIL (commercial) — with private industry as production base [S5][S6].

16 Aug 2024: SSLV-D3/EOS-08 launched successfully, closing SSLV development phase [S4].
18 May 2025: PSLV-C61/EOS-09 — performance normal till 2nd stage; 3rd stage anomaly; mission not accomplished [S7].
10 Sept 2025: SSLV Technology Transfer Agreement signed with HAL [S5].
24 Feb 2026: ISRO update confirms National Level Expert Committee reviewing PSLV anomaly [S7].
01 Apr 2026: Parliament reply on PSLV deferrals and SSLV handover [S1].

PSLV's first successful flight: 1994 [S2].
SSLV payload range: 10–500 kg to 500 km planar orbit [S3].
SSLV-D3/EOS-08 launch date: 16 August 2024 [S4].
SSLV TTA signed: 10 September 2025 [S5].
SSLV production partner selected: Hindustan Aeronautics Limited (HAL) [S5].
NSIL incorporated under Department of Space; mandate includes PSLV and SSLV production via Indian industry [S6].
PSLV-C61/EOS-09 failure date: 18 May 2025, third-stage anomaly [S7].
PSLV-C62 failure prompted a National Level Expert Committee [S1][S7].
Three-tier reform architecture: ISRO + IN-SPACe + NSIL [S5].
SSLV is a three-stage all-solid vehicle with a Velocity Trimming Module (VTM) [S3].
NISAR = NASA-ISRO Synthetic Aperture Radar mission [S1].
Gaganyaan, NISAR, climate/weather satellites mentioned as active ISRO projects in the 01 Apr 2026 reply [S1].

GS-III: Science & Technology — Achievements of Indians in S&T; indigenization; Space.
Possible stems: 1. "Critically examine the rationale and progress of transferring SSLV technology to private industry. How does it advance India's commercial space ambitions?" (GS-III) 2. "Discuss the institutional architecture for India's space sector following the 2020 reforms, with reference to ISRO, IN-SPACe and NSIL." (GS-III) 3. "Recent setbacks in PSLV missions have raised questions on quality assurance. Evaluate ISRO's failure-review mechanism." (GS-III)

NSIL vs Antrix: NSIL (2019) is the current commercial arm; Antrix is older — don't confuse mandates [S6].
SSLV ≠ PSLV-XL: SSLV is a wholly new small-lift vehicle, not a PSLV variant [S3].
PSLV-C61 vs PSLV-C62: C61 failed on 18 May 2025 (3rd stage); C62 failure triggered the Expert Committee referenced in April 2026 [S1][S7].
SSLV TTA partner: HAL, not L&T or a private consortium alone — though earlier shortlists included other firms [S5].
IN-SPACe is regulator/promoter, NOT a launch provider; aspirants often conflate it with NSIL [S5].
Department of Space reports directly to the PM, not to MoD or MeitY.

[S1] PARLIAMENT QUESTION: PSLV AND SSLV PROGRAMMES — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2247712 — (tier: 1)
[S2] PSLV — https://www.isro.gov.in/PSLV_CON.html — (tier: 1)
[S3] Small Satellite Launch Vehicle — https://www.isro.gov.in/sslv_CON.html — (tier: 1)
[S4] SSLV-D3/EOS-08 Mission — https://www.isro.gov.in/Mission_SSLV_D3.html — (tier: 1)
[S5] Technology Transfer Agreement signed for SSLV — https://www.isro.gov.in/Technology_Transfer_Agreement_SSLV.html — (tier: 1)
[S6] PARLIAMENT QUESTION: COOPERATION WITH PRIVATE SECTOR IN SPACE DEVELOPMENT — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2115227 — (tier: 1)
[S7] PSLV related Update — https://www.isro.gov.in/PSLV_Update.html — (tier: 1)