Isro NVS-02 failure: Broken electrical circuit likely prevented orbit injection, says committee

What Happened

• ISRO's Apex Committee released findings on February 25, 2026, explaining the failure of the NVS-02 navigation satellite, launched aboard GSLV-F15 from Sriharikota on January 29, 2025.
• The satellite was successfully placed into a Geostationary Transfer Orbit (GTO) approximately 19 minutes after liftoff — with perigee at 170 km, apogee at 37,785 km, and inclination of 20.8 degrees — but subsequent orbit-raising operations failed entirely.
• The Failure Analysis Committee, headed by former ISRO Chairman A.S. Kiran Kumar, determined that the ignition signal did not reach the pyro (pyrotechnic) valve on the oxidiser line of the orbit-raising engine.
• Root cause: at least one electrical contact inside connectors became disengaged in both the primary and redundant (backup) circuit paths, preventing the drive signal from firing the pyro valve and opening the oxidiser flow.
• Because the oxidiser could not reach the engine, the apogee motor never fired, leaving NVS-02 stranded in the elliptical GTO rather than raising to its intended Geostationary Orbit (GSO) at approximately 36,000 km.
• The committee's report was submitted to the government in October 2025; ISRO made the findings public in February 2026.
• Corrective action — a redesigned dual-connector fix in the pyro system — was implemented and successfully validated on the CMS-03 (GSAT-7R) satellite launched by LVM-3 M5 on November 2, 2025.

Static Topic Bridges

NavIC and the NVS Satellite Series

NavIC (Navigation with Indian Constellation), also called the Indian Regional Navigation Satellite System (IRNSS), is India's indigenous regional satellite navigation system. It provides Positioning, Navigation and Timing (PNT) services across India and a region extending up to 1,500 km beyond its borders, with an accuracy of approximately 10 metres within India and 20 metres in the surrounding region.

The first generation of IRNSS consisted of seven satellites (IRNSS-1A through 1G) launched between 2013 and 2017. The NVS series represents the second generation, designed to replace and augment the older constellation. Key improvements in the NVS series include:

• Addition of the L1 civil signal band (alongside existing L5 and S bands), enabling NavIC compatibility with consumer-grade devices such as smartphones, wearables, and IoT sensors.
• Use of the indigenously developed Rubidium Atomic Frequency Standard (iRAFS) clock, which outperforms first-generation IRNSS atomic clocks across all integration times.
• Enhanced navigation payload for improved signal accuracy.

NVS-01, the first second-generation satellite, was successfully launched in May 2023. NVS-02 was intended to be the second in this series.

Pyrotechnic (Pyro) Valves and Spacecraft Propulsion Systems

Pyrotechnic valves are one-time-use explosive actuators used to seal or open propellant lines in spacecraft. Before an engine burn, pyro valves must fire to allow propellant (fuel and oxidiser) to flow into the combustion chamber. They are used because they are highly reliable under normal conditions — once armed and triggered, they open in milliseconds — but they require a precise electrical ignition signal.

In the NVS-02 case, the apogee motor (the engine used to raise orbit after separation from the launch vehicle) relied on a pyro valve in the oxidiser line. The oxidiser (typically a nitrogen tetroxide compound in liquid-fuelled systems) must combine with fuel in the combustion chamber for the engine to ignite. Without the oxidiser valve opening, no combustion is possible.

The investigation found that a connector carrying the electrical ignition signal had at least one contact disengage — in both the primary and backup pathways. This type of fault is a classic "open circuit" failure: the signal was generated, but could not complete its path to the valve. Because the redundancy was designed at the level of the pyro valve itself (two valves in parallel), but not at the level of the connector, both pathways shared the same failure point.

ISRO's Failure Analysis Process and Quality Control

Failure Analysis Committees (FACs) are a standard institutional mechanism in space agencies worldwide. When a mission anomaly occurs, an FAC is constituted immediately to conduct a systematic, evidence-based investigation. ISRO has used this mechanism after several launch failures, including the GSLV-D1, GSLV-F02, and more recently the PSLV-C61 and PSLV-C62 failures (2025 and January 2026 respectively).

For NVS-02, ISRO constituted the Apex Committee under former ISRO Chairman A.S. Kiran Kumar, indicating a high-level institutional response. The process involved simulation data analysis, component-level teardown, and identification of probable cause before finalising corrective action. Importantly, ISRO implemented and validated the corrective measure (dual-connector fix) on a subsequent operational mission before publicly releasing the failure report — a practice consistent with responsible disclosure in engineering organisations.

However, the broader context of multiple ISRO failures in quick succession — NVS-02 (January 2025), PSLV-C61 (May 2025), and PSLV-C62 (January 2026) — has raised questions about systemic quality control, supplier oversight, and institutional bandwidth amid an expanding mission manifest (Gaganyaan, Chandrayaan-4, Shukrayaan, and commercial launches all in progress simultaneously).

India's Space Policy 2023 and the Privatisation of Space Activities

India's Space Policy 2023 marks a structural shift in how India organises its space sector. It designates ISRO as the primary research and development body, reserving it for cutting-edge science and next-generation technology development. Operational and commercial space activities are increasingly transferred to the private sector through two new institutions:

• IN-SPACe (Indian National Space Promotion and Authorisation Centre): An autonomous body under the Department of Space, responsible for authorising and promoting private sector participation across the space value chain — launch, satellites, ground stations, and downstream applications.
• NSIL (NewSpace India Limited): A government-owned commercial entity handling technology transfer, commercial launch services, and satellite procurement on behalf of government users.

The policy permits 100% FDI in satellite manufacturing and sets a target of growing India's space economy to $44 billion (approximately Rs. 3.75 lakh crore) by 2033, capturing 8% of the global space market.

Key Facts & Data

• Launch date of NVS-02: January 29, 2025, aboard GSLV-F15 from Sriharikota (SDSC SHAR)
• Launch vehicle: GSLV-F15 (Geosynchronous Satellite Launch Vehicle)
• Intended orbit: Geostationary Orbit (GSO) at ~36,000 km
• Achieved orbit: Geostationary Transfer Orbit (GTO) — perigee 170 km, apogee 37,785 km, inclination 20.8 degrees
• Failure point: Pyro valve in oxidiser line of apogee motor did not receive ignition signal
• Root cause: Electrical contact disengagement in connector — both primary and redundant pathways
• Failure type: Open circuit at connector level
• FAC head: Former ISRO Chairman A.S. Kiran Kumar
• Report submitted: October 2025; publicly released: February 25, 2026
• Corrective action validated: CMS-03 (GSAT-7R) mission, November 2, 2025, via LVM-3 M5
• NavIC accuracy: 10 m within India, 20 m in 1,500 km surrounding region
• NVS series distinguishing features: L1 band civil signal, iRAFS atomic clock
• India's space economy target: $44 billion by 2033 (Indian Space Policy 2023)