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 <a href="https://en.wikipedia.org/wiki/Critical_ionization_velocity" class="extiw" title="en:Critical ionization velocity">en:Critical ionization velocity</a> (CIV) experiment.
NASA
1991-05-06
<a rel="nofollow" class="external text" href="https://images.nasa.gov/details/s39-367-006">NASA STS039-367-006</a> <a rel="nofollow" class="external text" href="https://images-assets.nasa.gov/image/s39-367-006/s39-367-006~orig.jpg">High Resolution Image</a>