On Friday, August 14th, SpaceX Rolled Starship 20 or SN20 to the orbital launch pad and testing area of Starbase. In a tweet, Elon Musk mentioned that Ship 20 will be rolled back to the bay after initial testing to complete additional assembly of heat tiles amongst gathering data from the tests.
Prior to conducting a suborbital test flight of a Super Heavy or Starship prototype, SpaceX must conduct tank tests to ensure the tank’s reliability. This involves performing multiple pressure tests prior to performing a static fire engine test to confirm the structural integrity of the launch vehicle. During tank tests, SpaceX pressurizes the tank with gaseous media or liquid propellants.
Pre-flight operations include mission rehearsals and static fire engine tests. The goal of mission rehearsals is to verify that all vehicle and ground systems are functioning properly, as well as to verify that all procedures are properly written. After final systems checkout, SpaceX would conduct a mission rehearsal without propellants on the launch vehicle (referred to as a dry dress rehearsal), followed by a mission rehearsal with propellants on the launch vehicle (referred to as a wet dress rehearsal) to verify full launch readiness. In addition to conducting dress rehearsals, SpaceX would conduct static fire engine tests. The goal of a static fire engine test is to verify engine control and performance. A static fire engine test is identical to a wet dress rehearsal, except engine ignition occurs. During a static fire engine test, the launch vehicle engines are ignited for approximately 15–30 seconds and then shut down. – Federal Aviation Administration