ISRO Launch Vehicle Failures and Systemic Corrective Measures
Source:The Hindu ↗
Why It Matters
Highlights the operational challenges in ISRO's launch vehicle programs while underscoring the critical role of space technology in deploying strategic assets like NavIC and dedicated military satellites (GSAT-7R) for India's national security and maritime domain awareness.
Summary
An ISRO panel determined that a loose electrical connection caused the failure of the GSLV-F15 mission carrying the NVS-02 navigation satellite by preventing a critical engine valve from opening. Corrective measures were subsequently applied to successfully launch the GSAT-7R (CMS-03) communication satellite for the Indian Navy via the LVM-3 rocket. Furthermore, a new committee has been formed to probe systemic issues behind recent PSLV launch failures.
Key Points
- An ISRO probe concluded that a loose electrical connection caused the GSLV-F15 mission to fail, preventing the NVS-02 navigation satellite from reaching its intended orbit.
- The corrective measures recommended by the panel were successfully implemented in the November 2025 launch of the CMS-03 (GSAT-7R) spacecraft via the LVM-3 rocket.
- GSAT-7R is India's heaviest communication satellite (~4,400 kg) and is a dedicated strategic asset for the Indian Navy to enhance secure space-based communications and maritime domain awareness.
- To address broader reliability concerns, ISRO has established a separate committee to investigate systemic issues behind recent failures of its workhorse rocket, the PSLV.
Important Terms
NavIC (IRNSS)
India's indigenous regional navigation system (originally IRNSS) using 7 satellites (3 GEO + 4 GSO) to provide positioning services over India and 1,500 km beyond.
UPSC context
GS Paper 3: Science & Technology. Essential for strategic autonomy and comparison with global systems like GPS or GLONASS.
LVM-3
India's heaviest, most powerful 3-stage launch vehicle (formerly GSLV Mk III), used for heavy communication satellites like CMS-03 and the Gaganyaan human spaceflight mission.
UPSC context
GS Paper 3: Space Technology. Focuses on indigenous heavy-lift capability and reducing dependence on foreign launchers (e.g., Ariane-5).
GSLV (Geosynchronous Satellite Launch Vehicle)
A three-stage rocket (solid, liquid, and cryogenic) designed to place satellites into Geosynchronous Transfer Orbit (GTO). Used for the NVS-02 mission.
UPSC context
GS Paper 3: Science & Technology. Tests understanding of different orbit-injection capabilities and launch vehicle reliability.
PSLV (Polar Satellite Launch Vehicle)
ISRO's "workhorse" four-stage launcher (alternating solid/liquid stages) primarily for Sun-Synchronous Polar Orbits; recently under scrutiny due to third-stage anomalies.
UPSC context
GS Paper 3: Science & Technology. Crucial for Earth observation missions and historical commercial launch success.
GSAT-7 Series
A dedicated series of military communication satellites; GSAT-7 (Rukmini) and CMS-03 (GSAT-7R) serve the Navy, while GSAT-7A serves the Air Force.
UPSC context
GS Paper 3: Security & Space. Relates to maritime domain awareness and network-centric warfare capabilities.
Cryogenic Engine
A sophisticated rocket engine using liquefied hydrogen and oxygen as propellants at extremely low temperatures, essential for heavy-lift and high-orbit missions.
UPSC context
GS Paper 3: Science & Technology. Represents the pinnacle of indigenous propulsion technology development.
Prelims Trap
GSAT-7R is an advanced second-generation navigation satellite integrated into India's NavIC constellation.
The GSAT-7 series (Rukmini, Angry Bird) are dedicated military communication satellites. The NVS series are navigation satellites for the NavIC constellation.
Static Concepts Connected
What distinguishes ISRO's operational launch vehicles: PSLV, GSLV, and LVM-3?
- PSLV (Workhorse): Four stages (alternating solid/liquid), optimized primarily for placing Earth Observation satellites into Polar Sun-Synchronous Orbits (LEO).
- GSLV: Three stages featuring a cryogenic upper stage, designed to place ~2.2-tonne class communication satellites into Geosynchronous Transfer Orbit (GTO).
- LVM-3: ISRO's heaviest rocket. Three stages (twin solid boosters, core liquid, upper cryogenic), capable of placing 4-tonne class satellites into GTO.
How do NVS satellites upgrade the legacy IRNSS (NavIC) constellation?
- Indigenous Clocks: They replace failure-prone imported atomic clocks with the indigenous Rubidium Atomic Frequency Standard (RAFS) developed by the Space Applications Centre.
- L1 Band Compatibility: They introduce the civilian L1 frequency band alongside the existing L5 and S bands, ensuring seamless interoperability with global GPS wearables and smartphones.
Cross-Topic Patterns
Space Tech + Maritime Security
GSAT-7R replaces Rukmini, linking ISRO's LVM-3 heavy-lift success directly to the Indian Navy's strategic footprint and its Maritime Domain Awareness across the Indian Ocean Region.
Defense + Network-Centric Warfare
Dedicated GSAT-7 assets highlight India's shift from dual-use satellites to specialized tactical nodes, seamlessly interlinking naval ships, submarines, AWACS, and UAVs for network-centric warfare.
Expect a multi-statement question in 2026 contrasting NavIC NVS-series upgrades (L1 band, indigenous clocks) with GSAT-7 military ops.
Linked PYQs · 4
Linked PYQs · 4
- 2018PrelimsGS1
With reference to the Indian Regional Navigation Satellite System (IRNSS), consider the following statements: 1. IRNSS has three satellites in geostationary and four satellites in geosynchronous orbits. 2. IRNSS covers entire India and about 5500 sq. km beyond its borders. 3. India will have its own satellite navigation system with full global coverage by the middle of 2019. Which of the statements given above is/are correct?
- 2018PrelimsGS1
With reference to India's satellite launch vehicles, consider the following statements: 1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites. 2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth. 3. GSLV Mk III is a four-staged launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines. Which of the statements given above is/are correct?
- 2016MainsGS3
Discuss India's achievements in the field of Space Science and Technology. How the application of this technology has helped India in its socio-economic development?
- 2022MainsGS3
What are the maritime security challenges in India ? Discuss the organisational, technical and procedural initiatives taken to improve the maritime security.
