ISRO Successfully Tests PSLV Third Stage 2026
Key points
In the News
The Indian Space Research Organisation (ISRO) successfully conducted a ground static test of the upgraded third stage (PS3) of the Polar Satellite Launch Vehicle (PSLV) on 12 November 2026 at the Satish Dhawan Space Centre, Sriharikota, Andhra Pradesh.
The test was conducted to improve the reliability and performance of the launch vehicle following technical anomalies in two earlier PSLV missions.
Background
The PSLV is one of India's major satellite launch vehicles, widely used for Earth observation, scientific and interplanetary missions.
ISRO reviewed the rocket's third-stage configuration after technical problems affected two missions:
PSLV-C61/EOS-09 (18 May 2025): The mission failed after an anomaly involving a reduction in chamber pressure during third-stage operation.
PSLV-C62/EOS-N1 (12 January 2026): The mission experienced a third-stage anomaly, resulting in flight-path deviation and failure to deploy its satellites into the intended orbits.
These incidents prompted ISRO to introduce engineering improvements and additional safety checks.
Key Highlights
Successful Ground Test: ISRO tested the modified PS3 solid rocket motor at Sriharikota on 12 November 2026.
Improved Nozzle Design: The nozzle configuration was modified to strengthen design margins and reliability.
Enhanced Mechanical Safety: Mechanical interfaces were reinforced, and redundant sealing systems were introduced.
Quality Control: Raw material acceptance standards and assembly procedures were updated.
Non-Destructive Testing: Improved inspection techniques were implemented during rocket integration and transportation.
Future Testing: ISRO plans additional tests after detailed analysis of the latest test data.
Important Facts for Competitive Exams
1. Polar Satellite Launch Vehicle (PSLV)
PSLV is a four-stage Indian launch vehicle developed by ISRO. It uses alternating solid and liquid propulsion stages and is widely employed for launching satellites into polar and Sun-synchronous orbits.
2. PSLV Third Stage (PS3)
The third stage uses a solid rocket motor to provide additional thrust after the second-stage operation. Its reliable functioning is essential for achieving the required flight trajectory.
3. Ground Static Test
A ground static test involves firing a rocket motor while keeping it secured at a test facility. Engineers examine parameters such as thrust, pressure, temperature and structural performance.
4. Non-Destructive Testing (NDT)
NDT refers to inspection techniques used to identify internal or surface defects in materials and components without damaging them. It improves the safety and reliability of aerospace systems.
5. Satish Dhawan Space Centre (SDSC-SHAR)
Located at Sriharikota in Andhra Pradesh, SDSC-SHAR is India's primary space launch centre and an important facility for rocket testing and launch operations.
Quick Revision
Organisation: ISRO
Launch Vehicle: Polar Satellite Launch Vehicle (PSLV)
Tested Component: Third Stage (PS3) Solid Rocket Motor
Test Date: 12 November 2026
Test Location: SDSC-SHAR, Sriharikota, Andhra Pradesh
Earlier Affected Missions: PSLV-C61 and PSLV-C62
Main Objective: Improve rocket reliability and safety
Important Technology: Solid Propulsion and Non-Destructive Testing
Next Step: Detailed test-data analysis and further testing
