In a statement, the Civil Aviation Administration of China said that part of the cockpit window broke as the plane was flying over Chengdu and the cause of the incident was under investigation.
The co-pilot and one cabin crew member suffered minor injuries in the incident, but no passengers were harmed.
Captain Liu Chuanjian's heroic actions moments after a cockpit windshield blew out on Monday, almost pulling his co-pilot from the Airbus A319, has won him praise from flight professionals and internet readers for saving over 100 people onboard. The next thing I know, my co-pilot had been sucked halfway out of the window'.
A pilot who survived the accident and hailed hero on social media Captain Liu Chuanjian said that the flight was at an altitude of 32,000 feet when there was a deafening sound that tore the cockpit.
According to Sichuan Airlines, the reason was due to a "mechanical failure" but no further details were available.
The Flight 3U8633, operated by Sichuan Airlines, was en route from southwest Chinas Chongqing Municipality to Lhasa, capital of Tibet Autonomous Region. Suddenly, the windshield just cracked and made a loud bang. The plane landed safely.
Pictures published by government-run Chengdu Economic Daily showed the plane missing one of its cockpit windows and damage to its cockpit controls.
The pilot added that the cabin equipment malfunctioned as a result and it was so noisy he could not hear the wireless.
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Pictures shared online show the co-pilot's side of the windshield gone and it emerged that he was nearly sucked out of the window by the sudden loss of pressure.
There were 119 passengers and nine crew members on board, according to the airline, which has arranged another flight to take the passengers to Lhasa.
It made its emergency landing in the southwest city of Chengdu.
Twenty-seven passengers received medical checkups in a hospital in Chengdu, but no injuries were detected.
The aircraft was shaking ferociously and he could not read the metres.
Everything in the cockpit was floating in the air.
Reports said the aircraft was an Airbus A319 and was cruising at 32,000 feet. Then the oxygen masks dropped... This incident is very odd and only further investigation will lead to a resolution, Zhang added.