The last data transmission captured by Flightradar24 occurred at about 3,200 feet altitude. While unverified videos showed the plane diving at a steep angle near the ground, it wasn’t clear how fast it was traveling at impact. The Bloomberg review was conservative and actual speeds may be higher. The speed estimates were based on how fast the jet traveled between two points and didn’t take into account wind direction or other atmospheric conditions. Bloomberg’s computations give a rough idea of how fast it was flying through the air by taking into account its horizontal speed over the ground as well as how fast it was descending. Flightradar24’s data includes the jet’s speed, but it’s measured horizontally across the ground. If it isn’t available for some reason, aerodynamic experts can perform extensive analysis to more closely estimate speed. Accident investigators should be able to find more precise speed data from the jet’s flight recorder. The crash of an Ethiopian Airlines 737 Max in 2019 was traced back to a sensor on the plane’s nose, but the sensor was never found after the jet hit the ground at a high speed, according to a preliminary report from that nation. Crash investigators have over decades perfected the examination of wreckage in search of clues, but some impacts can obliterate evidence. and installed on the plane when it was new, according to company spokesman Adam Kress. The two recorders on the China Eastern 737-800 - a cockpit voice recorder and another that captures flight data - were supplied by the aerospace division of Honeywell International Inc. Searchers won’t be aided by a beacon or “ping” from the devices because they are only activated underwater. “But I would suspect it would be OK.” No beacon activated Zhu Tao, an official with the Civil Aviation Administration of China, said at a briefing on Tuesday that the recorders had not been recovered. “It’s probably embedded in the ground somewhere,” he said. But data can usually be extracted even if they’re damaged, he said. The circuit boards storing the data often break loose from the recorder’s protective exterior.
“The hard part is going to be finding it,” Cash said. Do the flight data recorder or cockpit voice recorder or quick access recorder - do any survive? I just don’t know the answer.” Modern black-box recorders, which store data on computer chips, have a good record of survival in high-velocity crashes, said James Cash, who formerly served as the US National Transportation Safety Board’s chief technical adviser for recorders. “It looks like it literally evaporated into a crater. “It was an exceedingly high-energy crash,” said Bob Mann, president of RW Mann & Co consultancy, who did not participate in the speed analysis. The speed data is consistent with videos appearing to show the jet diving at a steep angle in the moments before impact and indicates that it likely hit the ground with huge force. The jetliner was cruising at about 595 mph before the dive. Flight 5735 was flying to Guangzhou from Kunming with 132 people on board at an altitude of about 29,000 feet when it began a sudden descent, according to data transmitted by the plane and captured by Flightradar24. “It was coming down steep.” Sound travels at 761 mph at sea level but slows with altitude as air temperature goes down and is about 663 mph at 35,000 feet (10,668 meters). “The preliminary data indicate it was near the speed of sound,” said John Hansman, a Massachusetts Institute of Technology astronautics and aeronautics professor who reviewed Bloomberg’s calculation of the jet’s speed. The Boeing Co 737-800 was knifing through the air at more than 640 miles (966 kilometers) per hour, and at times may have exceeded 700 mph, according to data from Flightradar24, a website that tracks planes. Such an impact may complicate the task for investigators because it can obliterate evidence and, in rare cases, damage a plane’s data and voice recorders that are designed to withstand most crashes. BEIJING: The China Eastern Airlines Corp jet that crashed Monday was traveling at close to the speed of sound in the moments before it slammed into a hillside, according to a Bloomberg News review of flight-track data.