Press Esc to close
Sunday 30 April 2017
News updated at 8:09 PM IST

Cause of GSLV-D3 failure analysed

Last updated: 10 July, 2010
Bangalore, July 9, DHNS: 1:19 IST

The sudden stopping of the Fuel Booster Turbo Pump (FBTP) resulting in the non-availability of liquid hydrogen (LH2) supply to the thrust chamber of the main engine, caused the failure of the third developmental flight of Geosynchronous Satellite Launch Vehicle (GSLV-D3) conducted on April 15.

This was the conclusion arrived at by a failure analysis committee formed to look into the failure of the GSLV-D3 which was to test the indigenously developed Cryogenic Upper Stage (CUS).

According to the findings, which were further reviewed by a national group of eminent experts, the acceleration was comparable with that of earlier GSLV flights up to 2.2 seconds from start of CUS.

However, the thrust build up did not progress as expected due to non-availability of liquid hydrogen (LH2) supply to the thrust chamber of the main engine.

“The above failure is attributed to the anomalous stopping of Fuel Booster Turbo Pump (FBTP). The start-up of FBTP was normal. It reached a maximum speed of 34,800 rpm and continued to function as predicted after the start of CUS. However, the speed of FBTP started dipping after 0.9 seconds and it stopped within the next 0.6 seconds,” a press release from ISRO stated.

The committee attributed two reasons for the failure of FBTP: gripping at one of the seal locations and seizure of rotor and rupture of turbine casing caused probably due to excessive pressure rise and thermal stresses.

ISRO is now planning to conduct a series of confirmatory ground tests. After incorporating necessary corrective measures, the flight testing of Indigenous Cryogenic Upper Stage on GSLV is targeted within a year. In the meantime, the next two GSLVs would fly with the available Russian Cryogenic Stages, the release said.

PSLV launch

The launch of ISRO’s Polar Satellite Launch Vehicle (PSLV-C15) has been scheduled for the morning of July 12.

The launch date originally fixed for May 9 was rescheduled after a marginal drop in the pressure in the second stage of the vehicle was noticed during mandatory checks carried out on the PSLV-C15 vehicle, according to the release.

PSLV-C15 is planned to launch India’s advanced remote sensing satellite Cartosat-2B, an Algerian satellite ALSAT-2A, two nano satellites NLS 6.1 and NLS 6.2 from University of Toronto, Canada and STUDSAT, a satellite built by students from seven academic institutions in Karnataka and Andhra Pradesh.

Go to Top

Photo Gallery
Laborers carrying bricks at a brick factory on the eve of International labour day on the outskirts.

Laborers carrying bricks at a brick factory on the eve of International labour day on the outskirts.

A laborer carries a sack of grain at a market on the eve of International labour day, in Bikaner...

A laborer carries a sack of grain at a market on the eve of International labour day, in Bikaner...

Roger Federer, of Switzerland, left, and Microsoft founder Bill Gates, right, celebrate...

Roger Federer, of Switzerland, left, and Microsoft founder Bill Gates, right, celebrate...

A decorated home at Bhilar village, India's first 'village of books' where Around 15,000 books...

A decorated home at Bhilar village, India's first 'village of books' where Around 15,000 books...

Bollywood actor Ranveer Singh during a promotional event, in Mumbai on Saturday...

Bollywood actor Ranveer Singh during a promotional event, in Mumbai on Saturday...

An elephant calf gets a shower on a hot summer day at Anna National Zoological Park, in Chennai...

An elephant calf gets a shower on a hot summer day at Anna National Zoological Park, in Chennai...

Indian team celebrates their win over New Zealand in their second match at the 26th Sultan Azlan...

Indian team celebrates their win over New Zealand in their second match at the 26th Sultan Azlan...

An albino peacock displays its feathers on a hot summer day at Anna National Zoological Park...

An albino peacock displays its feathers on a hot summer day at Anna National Zoological Park...

A helicopter carrying the body of famed Swiss climber Ueli Steck arrives at Teaching Hospital...

A helicopter carrying the body of famed Swiss climber Ueli Steck arrives at Teaching Hospital...

A security person keeps tight vigil as the vehicles loaded with official documents moving toward...

A security person keeps tight vigil as the vehicles loaded with official documents moving toward...

Like us on Facebook

Copyright 2017, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bengaluru - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523
Powered by Yodasoft Technologies Pvt. Ltd.