S139 Core Booster Motor Segments (PSLV / GSLV Mk II)
Walchandnagar Industries- ApplicationCore (first-stage) booster motor casing segment, PSLV / GSLV Mk II
- Isro designationS139
- Units delivered to date134
First-stage core booster motor casing segments (S139) manufactured for ISRO's PSLV and GSLV Mk II first stage.