A United Airlines Boeing 777-200 passenger plane exploded and caught fire at high altitude. Parts of the passenger plane flew and dropped while turning back. The picture was shocking. The National Transportation Safety Board stated yesterday (22) that a preliminary investigation determined that the engine was malfunctioning Related to “metal fatigue”.
United Airlines (United Airlines) Boeing 777-200 passenger plane numbered 328 took off from Denver International Airport to Honolulu, Hawaii on the afternoon of the 20th. The engine on the right side exploded and caught fire 4 minutes after takeoff. Turned back to the airport, but the large parts flew off while flying, causing flight safety concerns. The National Transportation Safety Board (NTSB) announced the damage of the aircraft on the 21st, and found that the fairing, intake duct, and 2 fan blades were all damaged. , The other fan blades are also damaged.
Reuters reported that the US National Sports Association announced its preliminary findings yesterday. The chairman of the National Sports Association, Robert Sumwalt, said at a press conference that the damage of a fan blade in the engine is consistent with metal fatigue. He said that the damaged Pratt and Whitney PW4000 engine fan blades will be inspected on the 23rd local time after being returned to the Pratt and Whitney laboratory.
Suvat pointed out that the airframe itself was somewhat damaged, but there was no structural damage. He said that the Yunan Association will further explore why the engine cowling may fall off, and why the engine has been shut down for fire, but it still caught fire. .
In February 2018, another United Airlines Boeing 777 airliner had an engine failure before landing in Honolulu, Hawaii. At that time, it was judged that the cause of the accident was also metal fatigue. Suvat said that it is not clear whether the two incidents are related.
In addition to United Airlines, in December 2020, a Japan Airlines Boeing 777 also rushed back to Okinawa Airport due to engine problems. This Boeing airliner also uses Pratt & Whitney PW4000 engines. At that time, Japan’s Transport Safety Board pointed out that two fan blades were damaged, and one of them had cracks due to metal fatigue.
At present, there are only 128 777 airliners equipped with Pratt & Whitney PW4000 engines in the world, accounting for less than 10% of the global Boeing 777 fleet. They are United Airlines, Japan Airlines, All Nippon Airways, Korean Air, and Korean Air. Asiana Airlines (Asiana Airlines), half of which has been grounded due to the epidemic, but Boeing still recommends that airlines temporarily ground the aircraft.
(Zhongshi News Network)
#Preliminary #accident #parts #Boeing #passenger #jet #engine #inflight #explosion #revealedChina #News