Editing Geosynchronous Satellite Launch Vehicle (section)

=== First stage ===
GSLV-D1 used the S125 stage which contained {{cvt|125|MT}} of solid propellant and had a burn time of 100 seconds. All subsequent launches have used enhanced propellant loaded S139 stage.<ref name=isroGSLVD2/> The S139 stage is 2.8 m in diameter and has a nominal burn time of 100 seconds.<ref name=GSLVD3>{{cite web|url=https://www.isro.gov.in/launchers/gslv|title=GSLV Launcher|publisher=ISRO|access-date=17 March 2021|archive-date=23 March 2019|archive-url=https://web.archive.org/web/20190323171054/https://www.isro.gov.in/launchers/gslv|url-status=dead}}</ref><ref>{{cite web|url=http://www.currentscience.ac.in/Downloads/article_id_093_12_1697_1714_0.pdf|title=Evolution of Indian launch vehicle technologies|publisher=Current Science|access-date=January 27, 2014}}</ref>

[[File:GSLV-F14, INSAT-3DS - Second stage GS2 being placed over first stage GS1.webp|thumb|upright=1.0|left|Hoisting of the GSLV-F14 second stage during vehicle integration]]