After back-to-back failures, Isro successfully tests modified PSLV 3rd stage

BENGALURU: In an important step towards restoring the reliability of its workhorse Polar Satellite Launch Vehicle (PSLV), Isro Thursday said it successfully conducted a ground static test of the rocket’s modified third stage (PS3) at the Satish Dhawan Space Centre (SDSC) in Sriharikota.The test, conducted on Thursday, follows two consecutive PSLV mission failures in which anomalies were observed in the rocket’s third stage. Isro said it had comprehensively reviewed the stage’s design margins, raw material acceptance criteria, assembly procedures and quality checks before introducing modifications to strengthen the system.Isro said the modified PS3 solid motor incorporates improvements to its nozzle configuration and mechanical interfaces, along with additional redundancy in its sealing systems. The space agency has also revised procedures for accepting raw materials, assembling the motor and conducting non-destructive tests (NDT) during integration and transportation.The mechanical interfaces have also been strengthened, with redundancy introduced in the sealing systems.