On April 11, < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E7%BE%8E%E5%9B%BD%E5%AE%87%E8%88%AA%E5%B1%80 "> NASA < / a > (< a target ="_ blank" href=" https://news.163.com/news/search?keyword=NASA "> NASA < / a >) said on Saturday, local time, that before that, it had made a survey on the" smart "at night_ blank" href=" https://news.163.com/news/search?keyword=%E7%81%AB%E6%98%9F "> Mars < / a > < a target ="_ blank" href=" https://news.163.com/news/search?keyword=%E7%9B%B4%E5%8D%87%E6%9C%BA "> helicopter < / a > rotor rotation test, encountered computer failure, mission engineers decided to make its first < a target =" test on Mars_ blank" href=" https://news.163.com/news/search?keyword=%E9%A3%9E%E8%A1%8C "> flight < / a > delayed for three days, on April 14 (Wednesday). On February 18, wit arrived on Mars with the willpower rover, and initially planned to conduct its first flight test in the late night of February 11 (or at noon Martian time). But on the evening of the 10th, when the rotor test was carried out, the timer on the helicopter failed, leading to the early end of the test. At the time of the failure, the computer on the smart was trying to switch from pre flight mode to flight mode. NASA said the smart helicopter is in good condition and has transmitted all its telemetry data to the earth. But engineers need more time to examine the data to see exactly what happened. In addition, the task team wants to reschedule failed tests. < p > < p > before Mars can survive its first cold flight, it must rely on solar panels to gather enough energy. The engineers also unlocked the helicopter's rotors and tested them at 50 rpm. < / P > < p > during the test on Friday night, the rotor of the smart helicopter tried to test at full speed, reaching 2400 rpm. This is the final test before the flight, but it does not seem to be a complete success at present. On April 4, smart launched on the surface of Mars and launched a 31 day test clock, during which it plans to conduct five flight tests. In the first flight demonstration, the smart needs to hover about 30 seconds at an altitude of 3 meters on the ground, aiming to achieve the first ever powered flight on an alien. (small) < / P > < p >