STS-39 Critical Ionization Velocity (CIV) gas release from OV-103 payload bay

STS039-367-006 (1 May 1991) --- One of the four compressed gas canisters on the forward port side of Discovery's cargo bay releases gas on flight day 4 of the STS-39 mission. The canisters are part of STS-39's Critical Ionization Velocity (CIV) experiment.