ISRO completes investigation into failure of its SSLV rocket on first launch
India’s space agency ISRO today released the results of its investigation into the launch failure of its SSLV rocket on its first flight in August 2022.
The investigation revealed that there was a vibration disturbance for a short duration on the Equipment Bay (EB) deck during the second stage separation. SSLV is a three-solid-stage launch vehicle unlike the PSLV, which is a four-stage rocket. The vibration affected the Inertial Navigation System (INS), resulting in declaring the sensors faulty by the logic in the Fault Detection & Isolation (FDI) software.
In plain English, it appears the vibration caused a failure in the inertial navigation system, thus resulting in the premature engine shutdown of the fourth stage.
According to the report, the problem has been fixed and the next SSLV launch is now tentatively scheduled for February 9, 2023.
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India’s space agency ISRO today released the results of its investigation into the launch failure of its SSLV rocket on its first flight in August 2022.
The investigation revealed that there was a vibration disturbance for a short duration on the Equipment Bay (EB) deck during the second stage separation. SSLV is a three-solid-stage launch vehicle unlike the PSLV, which is a four-stage rocket. The vibration affected the Inertial Navigation System (INS), resulting in declaring the sensors faulty by the logic in the Fault Detection & Isolation (FDI) software.
In plain English, it appears the vibration caused a failure in the inertial navigation system, thus resulting in the premature engine shutdown of the fourth stage.
According to the report, the problem has been fixed and the next SSLV launch is now tentatively scheduled for February 9, 2023.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
Some help me here.
Three stage solid rockets.
How does one shut down a solid rocket, short of a flight termination system?
sippin_bourbon: Excellent question. During the launch it was very clear that the final stage was not putting out enough power, and the flight path was steadily dropping below the nominal line, as shown on one of the computer screen graphs.
According to the Wikipedia page on SSLV, it was the fourth stage, which uses liquid fuel, that shut down prematurely.
I have corrected my post to match this. Thank you for pointing me in the right direction.