China Eastern Airlines Flight 5735

China Eastern Airlines Flight 5735 was a scheduled domestic passenger flight from Changshui International Airport, Kunming, to Baiyun International Airport, Guangzhou in China. At 14:23 CST (06:23 UTC) on 21 March 2022, the Boeing 737-89P aircraft descended steeply mid-flight and struck the ground at high speed in Teng County, Wuzhou, Guangxi, killing all 132 passengers and crew on board. Multiple reports say that the airplane was deliberately crashed, but the official investigation by the Civil Aviation Administration of China (CAAC) is ongoing. It is the third deadliest air crash in China after China Southern Airlines Flight 3943 and China Northwest Airlines Flight 2303, the deadliest air accident in China Eastern Airlines' history, and the deadliest plane crash in 2022.

Flight
The aircraft departed Kunming Changshui International Airport for Guangzhou Baiyun International Airport at 13:15 (05:15 UTC) and was scheduled to land at 15:05 (07:05 UTC). The aircraft was scheduled to travel earlier from Baoshan to Kunming, but this segment of the journey was temporarily suspended due to low passenger numbers as a result of the COVID-19 pandemic in mainland China.

Contact with the aircraft was lost over the city of Wuzhou. At 14:22 (06:22 UTC), while approaching its top of descent into Guangzhou, the aircraft entered a sudden steep descent from 29100 ft. It briefly leveled off and climbed from 7400 ft to 9225 ft, but then plunged downwards again, reaching a final recorded altitude of 3225 ft at 376 kn less than two minutes after the beginning of the descent, with a maximum descent rate of above 32000 ft per minute.

At 14:23 (06:23 UTC), the aircraft lost signal and crashed in the mountainous regions of Teng County causing a fire in nearby vegetation. According to an astronautics and aeronautics professor at Massachusetts Institute of Technology, preliminary data indicated the aircraft traveled close to the speed of sound when it crashed. Data from Flightradar24 suggest it was traveling at speeds of 640 km/h and may have exceeded 1126 km/h at the time of impact. The aircraft's impact into the ground created a crater 100 ft wide and 66 ft deep, where most of the wreckage was discovered.

Residents of the villages surrounding the crash site heard a loud explosion. The final descent and crash was recorded by a security camera at the premises of a local mining company. The video showed the plane in a near vertical dive seconds before it struck the ground. Footage from the crash site showed wreckage and a fire. Many smaller pieces of wreckage were scattered in the surrounding area. All of the plane's occupants died. It was the first fatal crash involving China Eastern Airlines since November 2004's Flight 5210.

Some information channels such as at Kunming Changshui International Airport and Umetrip temporarily showed the flight had arrived due to not registering the flight's loss of contact. Others showed "loss of contact", "unknown", or a blanked-out status.

Aircraft
The aircraft involved was a Boeing 737-89P (737NG or 737 Next Generation) registered as B-1791 and serial number 41474. The aircraft was powered by two CFM56-7B26E turbofan engines. It first flew on 5 June 2015 and was delivered new to China Eastern Yunnan Airlines (subsidiary of China Eastern Airlines) on 25 June 2015. It was painted in the airline's Yunnan Peacock livery.

The 737-800 has a solid safety record, with 11 previous fatal accidents (the first in September 2006) out of more than 7,000 planes delivered since 1997.

Passengers and crew
The Civil Aviation Administration of China (CAAC) and the airline reported 123 passengers and 9 crew members to be on the flight, for a total of 132 people. All were Chinese. The occupants involved 74 families across 17 provinces of China.

The flight crew consisted of three pilots, five flight attendants and an in-flight security guard.
 * 32-year-old Captain Yang Hongda (Mandarin, Traditional-楊洪達, Mandarin, Simplified-杨洪达)had been employed as a Boeing 737 pilot since January 2018, with a total of 6,709 flight hours.
 * 59-year-old First officer Zhang Zhengping (Mandarin, Traditional-張正平, Mandarin, Simplified-张正平) was amongst China's most experienced commercial pilots, with 31,769 flight hours, and was a flight instructor for China Eastern, having trained more than 100 captains. He had been awarded the honorary title of "Meritorious Pilot" of civil aviation in 2011.
 * 27-year-old Second officer (as observer) Ni Gongtao (Mandarin, Traditional-倪公濤, Mandarin, Simplified-倪公涛), with a total of 556 flight hours, was aboard to fulfill training duties.

Emergency response and recovery
Local authorities dispatched 450 firefighters to the scene of the accident. Firefighters were dispatched by the Wuzhou Fire and Rescue Department at 15:05. At 15:56, firefighters from nearby Tangbu arrived, and at 16:40, firefighters from outside Wuzhou were dispatched from Guilin, Beihai, Hezhou, Laibin and Hechi.

Rescue crews initially had difficulty accessing the site because of the forest fire which was extinguished by 17:25. By evening, 117 out of 650 dispatched rescuers were nearby and headed to the site from three directions. Aircraft wreckage and victims' belongings were found, but no signs of human remains were detected. Workers used hand equipment, detection dogs and UAVs to search for the flight recorders and human remains, finding one flight recorder on 23 March. The crash site was concentrated within a 30 m radius where most of the wreck was found. Major components such as the horizontal stabilizers, vertical tails, rudders, left and right engines, left and right wings, fuselage parts, landing gear and cockpit were recovered from the area. Rescue workers found a 1.3 m fragment of a wing trailing edge about 12 km from the main site.

Wet weather and the challenging accessibility of the crash site hampered the recovery process. Heavy rain partially filled the impact crater with water which had to be pumped away. Recovery activities were suspended on the morning of 23 March because of the threat of landslides. The remains of all 132 aircraft occupants were positively identified by 29 March. As of 31 March 2022, at least 49,117 pieces of airplane wreckage had been recovered.

Initial investigation
The CAAC enabled an emergency task force and dispatched a team to the crash site. Liu Ning, secretary of the Chinese Communist Party in Guangxi, visited the crash site and ordered an "all-out" search and rescue operation. He was accompanied by the director of Standing Committee of the People's Congress of Guangxi and other officials.

American agencies responded as representatives of the country where the aircraft was manufactured. The Federal Aviation Administration (FAA) said it was ready to assist in investigation efforts if requested. Boeing said that it was informed by initial reports and was gathering details. The National Transportation Safety Board (NTSB) said a senior official had been appointed as its representative to the inquiry. Representatives from CFM International, Boeing, and the FAA were assigned as technical advisers in the probe. United States Transportation secretary Pete Buttigieg said on 23 March 2022 that Chinese authorities had invited the NTSB to take part in the investigation. COVID-19 quarantine regulations may have hampered access of U.S. investigators to mainland China. On 29 March 2022, the NTSB announced that China had granted visas to the agency and the technical advisors from Boeing, engine manufacturer CFM and the FAA.

The cockpit voice recorder (CVR) was found on 23 March 2022, severely damaged externally, but the internal storage unit appeared to be relatively intact. It was sent to Beijing for data extraction. The emergency locator transmitter (ELT) was retrieved on 26 March, and on 27 March, the flight data recorder (FDR) was recovered. It had been buried 1.5 m deep in the soil and appeared slightly dented but was intact. The two flight recorders were sent to a facility in Washington, D.C. for analysis. Concurrently, on 1 April 2022, a team of NTSB investigators left the United States for China.

Mao Yanfeng, head of aircraft investigation at the CAAC, stated the flight had not encountered dangerous weather conditions. No components of common explosives were detected. Chinese leadership called for open, timely and transparent publication of information about the crash. The CAAC published a preliminary report on 20 April 2022, 30 days after the accident. Soon after the accident, it was suggested that catastrophic failure of the tailplane (for example, a stabilizer problem) and sabotage (such as a pilot intentionally crashing) were two of the possibilities regarding the cause of the crash. On 24 March 2022, a piece of the jet was discovered about 10 km from the crash site, initially giving weight to the theory of a mid-air breakup. However, Chinese authorities later confirmed that it was a winglet, whose loss should not severely impair airworthiness, and which is lightweight enough to either have flown to the ground in the wind or broke-up during the descent.

Preliminary report
On 20 April 2022, CAAC released a preliminary report regarding the accident, stating that "there was no abnormality in the radio communication and control command between the crew and the air traffic control department before deviating from the cruise altitude." It was reported that the plane was airworthy, up to date on inspections, that all personnel met requirements, that weather was fine, and that no dangerous goods were found. Both aircraft recorders were severely damaged and were sent to Washington for further investigation.

On the eve of the first anniversary in March 2023, the CAAC released an unusually short interim statement that the investigation is ongoing due to the "very complicated and very rare" nature of the accident. , no final report has been released. The CAAC released a statement in March 2024 reiterating preliminary findings from the previous year that there were no issues with the aircraft and crew.

Media reports of the investigation
Early reports of the aircraft's flight data recorder pointed towards a deliberate crash from the cockpit. Flight controls were pushed to put the plane into a dive. This led the investigation toward the pilot or the possibility of a cockpit breach. China Eastern noted the unlikeliness of anyone breaching the cockpit, as an emergency code was not broadcast. Chinese authorities are not pointing to issues regarding mechanical or flight control problems.

On 17 May 2022, The Wall Street Journal reported a source from the US government, from officials involved in the investigation, as saying that the plane had been intentionally crashed, based on an analysis of data from the aircraft recorders. News reports published by ABC News on the same day concurred with the Wall Street Journal's report of the investigating officials in the US government declaring that the aircraft had been deliberately put into a vertical dive by a person on the flight deck, also citing flight recorder data showing that the landing gear and flaps had evidently not been engaged or deployed during the aircraft's descent which would indicate the pilots attempting an emergency descent or landing.

Multiple reports also mentioned that in the moments just before and during the descent, there were no distress or mayday calls from the cockpit to air traffic control nor any answers to the attempts from air traffic control and nearby aircraft to make contact with the aircraft. A video was released to the public on the day of the accident, showing the aircraft entering a steep dive before slamming into a hilly area.

Interim report
On 20 March 2024, the Civil Aviation Administration of China published an interim update, according to which "no anomalies" had been found, all activities and procedures adhered to the prescribed protocols, ground crew including the air traffic control personnel were found competent, and navigation equipment were working as expected. Officials further stated they would update the report as more information becomes available. The report was published one day before the two-year anniversary of the crash.

Domestic
Chinese premier Li Keqiang called for comprehensive efforts to search for survivors and treat the injured, emphasizing the need to reassure and serve the families of the victims. Chinese leader Xi Jinping called for investigators to determine the cause as soon as possible and to ensure "absolute" aviation safety. Over 1,000 psychology staff were dispatched to provide aid and emotional support to the families of the victims.

China Eastern established a hotline for family members and announced that its Boeing 737-800 fleet would be grounded for inspection until the investigation was completed. Most of the airline's 737-800s eventually returned to service in April 2022.

VariFlight reported that nearly 74 percent of the 11,800 flights scheduled in China on 22 March were cancelled as a result of the crash. A majority of flight services between Beijing and Shanghai were cancelled. Cancellation rates in China were the highest of 2022. Nearly 89 percent of all China Eastern flights were cancelled on 22 March.

News concerning the crash was heavily censored in China. State-run media focused on the emergency crews' response, including detailed lists of their equipment and provisions, and orders from Xi Jinping that officials do everything possible to find survivors. After officials initially failed to answer basic questions about the plane and its pilots, they were accused by online commentators of "rainbow farts," an idiom for excessive praise. Articles and social media posts that asked more detailed questions were deleted by censors. Faced with mounting pressure, officials eventually provided information on the maintenance history of the plane, the pilots' flight experience, and weather conditions at the time of the crash.

Within two hours of the crash, twenty people claimed to have "survived" by not boarding the flight. Local media found only two of these claims to be genuine.

International
A number of world leaders expressed condolences for the loss of life incurred.

In India, the Directorate General of Civil Aviation (DGCA) placed all Boeing 737 aircraft flown by Indian carriers under "enhanced surveillance." SpiceJet, Vistara and Air India Express have the aircraft in their fleets. An official from the regulatory body said that "safety is serious business" and that the situation was being closely monitored.

On U.S. stock markets, Boeing shares initially fell by 7.8 percent and China Eastern shares by 8.2 percent after the incident. On the Hong Kong Stock Exchange, China Eastern shares dropped by 6.5 percent.

Boeing offered its condolences to the families of the victims and said that it was in contact with China Eastern and the NTSB.