The manufacturer has said there is a documented procedure to handle the situation. That was the only thing they talked about."īoeing Co declined to comment on Wednesday because the investigation was ongoing. "They thought only about airspeed and altitude. "They didn't seem to know the trim was moving down," the third source said. Normally, trim adjusts an aircraft's control surfaces to ensure it flies straight and level. The captain fought to climb, but the computer, still incorrectly sensing a stall, continued to push the nose down using the plane's trim system. A stall is when the airflow over a plane's wings is too weak to generate lift and keep it flying. The captain asked the first officer to check the quick reference handbook, which contains checklists for abnormal events, the first source said.įor the next nine minutes, the jet warned pilots it was in a stall and pushed the nose down in response, the report showed. The first officer did not specify the problem, but one source said airspeed was mentioned on the cockpit voice recording, and a second source said an indicator showed a problem on the captain's display but not the first officer's. ![]() Just two minutes into the flight, the first officer reported a "flight control problem" to air traffic control and said the pilots intended to maintain an altitude of 5,000 feet, the November report said. ![]() The captain was at the controls of Lion Air flight JT610 when the nearly new jet took off from Jakarta, and the first officer was handling the radio, according to a preliminary report issued in November.
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