Use wechat scan QR code to share with friends and circle of friends_ blank" href=" https://news.163.com/news/search?keyword=SpaceX "> SpaceX < / a > Company's interstellar < a target ="_ blank" href=" https://news.163.com/news/search?keyword=%E9%A3%9E%E8%88%B9 "> spaceship < / a > prototype sn9 in flight test < a target ="_ blank" href=" https://news.163.com/news/search?keyword=%E7%9D%80%E9%99%86 "> landing < / a > < a target ="_ blank" href=" https://news.163.com/news/search?keyword=%E5%9D%A0%E6%AF%81 "> to supervise the investigation of the crash. Before that, because SpaceX was still investigating the explosion of the prototype SN8, FAA forced SpaceX to postpone the high-altitude flight test of sn9. < / P > < p > in the flight test on Tuesday, sn9 rose to an altitude of 10km above the ground, circled in the air, then experienced abdominal tumbling like excitement when descending, and finally exploded when landing at the launch pad. < / P > < p > "even if there are anomalies, FAA's top priority in regulating commercial space transportation is to ensure operational safety," a spokesman for the agency said in a statement. "Today, SpaceX prototype sn9 landed in boccachica, Texas, and the FAA will supervise the investigation. Although this is an unmanned flight test, the investigation should find out the root cause of today's accident and further improve safety during the development of the project. " < / P > < p > asked how the investigation would proceed, the spokesman said: "we have nothing else to say tonight." < / P > < p > however, according to the FAA's public documents, when a rocket "accident" occurs, the commercial space transportation office under the FAA "may choose to investigate or authorize the launch operator to investigate", which will be carried out under the supervision of the FAA. < / P > < p > FAA defines "accident" as "launch or re-entry accident, launch or re-entry event, launch site accident, failure to complete launch or re-entry as planned, loss up to US $25000, death or serious injury". < / P > < p > during the launch, three Raptor engines on sn9 ignited, shut down and re ignited, and landed as planned. But sn9 exploded violently when it landed at the launch pad, and it is not clear what the problem was. < / P > < p > SpaceX engineer John insprucker said in the company's live broadcast that sn9 "looked very good" for most of the flight test. Engineers were able to collect various data during the flight to help improve the design, and sn9 rose to an altitude of about 10 kilometers above the ground. "We have demonstrated the functions of sn9 from starting the engine to the propellant storage tank in the landing phase, and the reentry process of the spacecraft prototype at subsonic speed looks very stable," inspruk said "We just need to do a little bit more on the landing." < / P > < p > before the flight test, sn9 was trapped on the launch pad in Texas last weekend. According to the FAA, sn9 was originally scheduled for a flight test last week, but failed to take off because SpaceX violated a public safety agreement with regulators in a previous flight test. < / P > < p > sn9 was fully fueled last Thursday and ready to launch. But surprisingly, the FAA issued a notice to cancel the planned flight test. < / P > < p > FAA is responsible for the regulation of us airspace, and is < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E7%81%AB%E7%AE%AD%E5%8F%91%E5%B0%84 "> rocket launch < / a > licensing. The agency ordered SpaceX to stop running its test facility in southern Texas on the grounds that "this may affect public safety.". But the FAA said on Tuesday that it had concluded this week that SpaceX had taken "corrective action" and now complied with public safety rules. < / P > < p > FAA announced on Monday night that it would resume the permission to launch SpaceX prototype sn9. < / P > < p > Elon Musk, CEO of SpaceX, publicly attacked FAA on twitter last week, but wrote on Tuesday morning that he would "temporarily leave twitter.". < / P > < p > the disagreement between SpaceX and FAA stems from a high-altitude flight test conducted by SpaceX on the Starship prototype SN8 in December last year, which also exploded on landing. Prior to the launch of SN8, SpaceX "sought exemption procedures in the expectation that the testing process would exceed the maximum public risk permitted by federal safety regulations," according to FAA. But the FAA rejected the exemption. < / P > < p > SpaceX still insisted on high-altitude "jump test", successfully reached the predetermined altitude, and completed a series of air maneuvers, but exploded during landing. Before the launch of the SN8, musk predicted that there was only a one-third chance that the SN8 would be intact in the test. In a statement on Tuesday, the FAA said SpaceX violated regulations by failing to effectively assess and document crash or explosion risks associated with "public health and safety.". "The FAA has asked SpaceX to investigate the incident, including a comprehensive review of the company's safety culture, operational decisions and process discipline," a FAA spokesman said in a statement on Tuesday "All tests that may affect public safety at bokaqika launch site will be suspended until the end of the investigation and the improvement measures of SpaceX are approved by FAA." < / P > < p > the FAA does not specify what corrective actions are. The spokesman added that the FAA "will not take further enforcement action against SN8." < / P > < p > "SpaceX's previous corrective actions have been approved to improve public safety. These initiatives have been included in the sn9 test. " < / P > < p > FAA has focused on how to adjust the launch licensing process to make it more "streamlined". However, it is not clear whether the procedural changes will help SpaceX to obtain authorization quickly and relax the relevant restrictions on public safety. < / P > < p > < / P > < p > SpaceX's starship prototype Sn10 has been assembled, and it is not clear when the company will try to launch it. But at the end of last week, Sn10 was already on another launch pad. (Chenchen) < / P > < p >