Further in-depth analysis of the second-stage failure identified the reason as the draining of a good amount of Red Fuming Nitric Acid (RFNA) used as the oxidizer for the fuel power at that stage. Consequently, when the control force was demanded, only fuel was injected resulting in zero force. 'A solenoid valve in the oxidizer tank remaining open due to contamination after the first command at T-8 minutes', was identified as the reason for the draining of RFNA.
