According to the investigation report, the most likely cause of this incident is that the sealing strip (weather-resistant sealing strip or sealing silica gel) of the right windshield of B-64 19 aircraft may be damaged, and there is a cavity inside the windshield, and external water vapor permeates and remains on the bottom edge of the windshield. After soaking for a long time, the insulation of the power cord is reduced, and the continuous arc discharge in wet environment appears in the lower left corner of the windshield. The local high temperature generated by arc causes the double-layer structure glass to break. The windshield could not bear the pressure difference inside and outside the cockpit and exploded from the fuselage.
Extended data:
A3 19 is a shortened version of Airbus A320. Compared with A320, the cross-sectional size of the fuselage is the same as that of A320, the fuselage is 3.73 meters shorter, the emergency exit on the wing is reduced by one, and the bulk cargo hold at the rear of the fuselage is cancelled.
Because it uses the same amount of fuel as the A320-200 and carries fewer passengers, that is, in the case of Class II layout 124 passengers, its voyage can reach 3900 nautical miles (7200 kilometers), making it the longest model in the A320 series. The high-density single-seat layout has 148 passengers.
People's Daily Online-Sichuan Airlines Flight 3U8633 Emergency Alternate Incident Investigation Report Released.