The passenger, Xu Zhimo, was intending to attend an architectural lecture given by the well-known architect Lin Huiyin in Beiping.This time first officer Liang was at the controls, as Captain Wang handed the flight over and moved to the passenger's seat.Seconds later, the aircraft hit the peak of what is now called West Mountain below the summit, about six kilometers from Dangjiazhuang Railway Station, and broke off its right wing.The Detroiter crashed into the valley below and disintegrated, resulting in a series of fire and explosions, killing two of the three on board instantly.The Government of the Republic of China claimed that the aircraft crashed into Mount Beida, where they set up a tomb to commemorate Xu.The investigation established that the crash site of the Stinson Detroiter was at West Mountain, which is in the east of Changqing District in southwest Jinan and one kilometer from the railway, at an elevation of 150 meters.The three bodies were later carried back to Jinan, and Xu's was eventually buried at Mount Beida, which local government had mistaken as the crash site.This chilled them, as in the same year, a Fokker F-10 had crashed in Kansas in the United States due to a structural failure of the aircraft's wing.Witnesses reported that the plane was flying dangerously lower than usual and was circling in the air seconds from the crash, which indicated to investigators that the pilots might have had difficulty finding their route.Based on the evidence, they hypothesized that the pilot descended the aircraft beneath the minimum safety altitude while attempting to seek their target, Wujiapu airport.There were no ground proximity warning systems on aircraft at that time, so when the terrain abruptly appeared in front of the windshields, it was too late for the pilot to divert the plane.They believe that the accident could have been avoided if the captain, sitting in the passenger's seat, had reminded the pilot at control that the flight was dangerously close to the terrain.