The fuel switches were moved. The engines lost power. The plane fell.
In March 2022, 132 lives ended in less than three minutes when a Boeing 737 fell from cruising altitude over a Chinese hillside — a disaster whose cause has lingered in deliberate obscurity. Now, data released by American investigators offers the clearest accounting yet: the aircraft's fuel supply was manually cut off at 29,000 feet, not by mechanical failure, but by human hands on human controls. That China's aviation authority continues to withhold its final findings, citing national security, speaks to the uncomfortable truth that some silences are themselves a form of disclosure.
- Both engine fuel switches were manually moved to cut-off mid-flight at 29,000 feet, causing an unsurvivable descent that killed all 132 people aboard in under three minutes.
- Black box data leaves no room for mechanical explanation — engine speeds dropped the instant the switches were activated, and those switches do not move on their own.
- Air traffic controllers called repeatedly as the plane plummeted; no one answered, and the last recorded signal came at 3,225 feet — far too late for any recovery.
- China's aviation authority denied pilot suicide theories, warned the public against speculation, and has since refused to release a final investigation report, citing national security.
- US investigators obtained the flight data recorder under a Freedom of Information request, making their findings public even as Beijing maintains its official silence four years on.
In March 2022, China Eastern Flight MU5735 departed Kunming on a clear morning bound for Guangzhou — a routine domestic journey that ended when the aircraft plunged from 29,100 feet to impact in just over two minutes, killing all 132 people on board. It became China's deadliest aviation disaster in decades, and for years its cause remained officially unresolved.
The US National Transportation Safety Board, invited to assist because the Boeing 737 was American-built, obtained the plane's black box from the wreckage. What the flight data recorder showed was unambiguous: during cruise, both fuel switches controlling the engines had been moved to the cut-off position. Engine speeds fell immediately. The switches are hand-operated controls — they do not move on their own. Air traffic controllers attempted to reach the crew throughout the descent and received no response.
China's Civil Aviation Administration confirmed the flight crew were licensed, rested, and medically cleared that morning, but offered no clear cause. As theories of deliberate cockpit action spread, officials pushed back, warning that pilot suicide rumors were misleading the public. The agency has since declined to release a final report, citing national security and social stability.
The NTSB data, released under American freedom of information law, now provides the most concrete evidence that this was no accident — not a structural failure, not a malfunction, but a deliberate act. Who moved those switches, and why, remains officially unanswered. Four years later, that unanswered question has become its own kind of statement.
In March 2022, a Boeing 737 carrying 132 people descended from the sky over a Chinese hillside in less than three minutes, dropping from cruising altitude to impact in what would become the country's deadliest aviation disaster in decades. For years, the cause remained opaque. Now, newly released data from the US National Transportation Safety Board points to a deliberate act: both fuel switches on the aircraft's engines were moved to the cut-off position while the plane was flying at 29,000 feet.
China Eastern Flight MU5735 had departed from Kunming that morning bound for Guangzhou, a routine domestic journey on a clear day. More than an hour into the flight, as the aircraft approached its destination, something changed. Flight tracking data captured the moment: at 29,100 feet, the plane was cruising normally. Two minutes and fifteen seconds later, it was at 9,075 feet. The descent was catastrophic and complete.
The NTSB, which had been invited to assist in the investigation because the 737 was designed and manufactured in the United States, obtained the aircraft's black box from the wreckage. Analysis of the flight data recorder revealed that the fuel switches controlling flow to both engines had been moved into the cut-off position during cruise. Engine speeds dropped immediately after the switches were activated. There was no ambiguity in the data. The switches do not move on their own; they are controls operated by hand, used by pilots to start or shut down engines.
Air traffic controllers had tried repeatedly to reach the aircraft during its descent. They received no response. The last signal from the plane came at 2:22 p.m. local time, at an altitude of 3,225 feet. By then, recovery was impossible.
China's Civil Aviation Administration, which led the investigation, confirmed that the flight crew held valid licenses, were adequately rested, and had passed health checks that morning. Officials initially offered no clear assessment of what caused the crash. But as months passed and speculation mounted—particularly theories that someone in the cockpit had acted deliberately—the CAA issued denials. A senior official warned that rumors about pilot suicide had "seriously misled the public and interfered with the investigation." The agency has since refused to release a final report, citing national security and social stability concerns.
The NTSB data, released under the US Freedom of Information Act, provides the most concrete evidence yet that the crash was not an accident. It was not a structural failure, not a mid-air collision, not a technical malfunction. The fuel switches were moved. The engines lost power. The plane fell. What remains unknown—and what China has chosen not to disclose—is who moved those switches and why. That silence, four years later, is itself a kind of answer.
Notable Quotes
These rumours have seriously misled the public and interfered with the investigation of the accident— Wu Shijie, China Civil Aviation Administration official, April 2022
The Hearth Conversation Another angle on the story
When you say the fuel switches were moved, how certain is the evidence?
The black box data is unambiguous. Both switches moved to cut-off at the same time, at cruise altitude. Engine speeds dropped immediately after. These aren't instruments that drift or fail gradually—they're physical controls.
Could a pilot have done this by accident?
Theoretically, but moving both fuel switches simultaneously at 29,000 feet, during normal cruise, strains credibility. These are deliberate actions, not reflexive ones.
Why has China refused to release its own findings?
They cite national security. But the effect is that the world is left interpreting American data about a Chinese airline's aircraft. It creates a vacuum that invites speculation.
What do we actually know about the people in the cockpit?
Only that they were licensed, rested, and medically cleared that day. Beyond that, China has released almost nothing. The crew's actions in those final moments remain entirely unknown.
Does this change how people think about aviation safety in China?
China's safety record has improved dramatically over decades. One catastrophic incident, even one this severe, doesn't erase that. But it does raise questions about transparency and accountability that haven't been answered.