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NASA and Boeing have postponed the CST-100 Starliner orbital flight test scheduled for the dawn of August 4 (local time). The reason is that the opening and closing of the valve included in the propulsion system during pre-launch preparation showed an unexpected value.
Boeing said it regrets the problem and said both sides are ensuring the spacecraft is safe and complete so that the next mission has the necessary time to achieve its goals. The Boeing Starliner conducted its first unmanned orbital flight test on December 20, 2019. However, it returned to the ground without carrying out some items, including docking the ISS included in the plan, and spent a year and a half in analysis and countermeasures to solve the problem.
This time, Orbital Flight Test-2 (Orbital Flight Test-2) is a flight to confirm that the problem has been resolved properly. In addition, even after successfully completing this test flight, it takes about half a year to analyze the collected data slowly, but if the test flight is not successfully completed first, Boeing will not be able to proceed with the manned flight.
This test flight was originally scheduled for July 30, but on the same day, the Russian ISS test wing had a problem with the ISS posture because the rocket was incorrectly injected immediately after docking with the ISS, so the mission was delayed at a certain interval. Related information can be found here.
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