Testing was conducted on the ground, engines near full power, shoving air into the cargo compartment via bleed air. https://en.wikipedia.org/wiki/Bleed_air htt

Testing was conducted on the ground, engines near full power, shoving air into the cargo compartment via bleed air. https://en.wikipedia.org/wiki/Bleed_air https://en.wikipedia.org/wiki/Bleed_air In this particular case, the "leak" was somewhere in the roof of the aircraft. My friend was laughing about how confused everyone else on the base would have been by seeing a blanket shooting out of the top of the Galaxy.