AS-203 (or

SA-203) - the use of unmanned flight Saturn I B rockets. Informally known as the Apollo 2 The main purpose of t he flight AS-203 was to investigate the effects of weightlessness on the fuel in the tank S-IVB. Member S-IVB rocket was expected to be a vessel of the Earths orbit toward the moon. Engineers wanted to see what will happen with the liquid hydrogen tank: Would it be peaceful, or will squelch inside the tank. S-IVB tank was equipped with 83 sensors and two TV camera recording the behavior of the fuel in the tank.