Investigations reveal Indonesia jet continued to fly despite damaged airspeed indicator

Lion Air crash Black box reveals plane had airspeed problems on final four flights

This latest incident came just over a week after a Lion Air plane crashed into the Java Sea on October 29, killing everyone on board, prompting the Indonesian Transport Ministry to conduct a special investigation into the airline.

To find out how serious the risks are due to the malfunction of the sensor, the Indonesian investigator would carry out a flight reconstruction in the Boeing facility in the United States.

The condition can even lead to "excessive nose-down attitude, significant altitude loss, and possible impact with terrain", the official noted.

Experts say the angle of attack is a crucial parameter that helps the aircraft's systems understand whether its nose is too high relative to the current of air - a phenomenon that can throw the plane into an aerodynamic stall and make it fall.

The Boeing 737-900 was on the runway at Fatmawati airport in Indonesia when its wing crashed into a metal post.

On November 6, Boeing said it had issued an Operations Manual Bulletin (OMB) directing operators to existing flight crew procedures to address circumstances where there is erroneous input from an AOA sensor.

Boeing is preparing to send a warning to all the operators that have taken delivery of its new 737 Max aircraft, according to an anonymous source cited by Bloomberg. The service was operated by a two month old 737 MAX 8.

Lion Air flight JT610 was en route to Pangkal Pinang, Indonesia, when it suddenly lost contact with traffic control operators after departing from Jakarta.

Going forward, Tjahjano said, the KNKT investigators have to recover the cockpit voice recorder to find out what was happening in the last minutes before the plane crashed into the waters.

That angle-of-attack sensor is meant to measure the direction of air flow over wings so that they maintain lift. However, if the sensor malfunctions, it can cause the plane's computers to erroneously think it is in a stall-which can then command the aircraft to abruptly dive.

Pilots can counteract this for up to 10 seconds at a time by pushing a switch on the airplane's controls.

The FAA, which regulates the U.S. aviation industry, has not received any reports of airspeed issues with the model in the United States, said a person familiar with its reviews, who asked not to be named as he was not authorized to speak. In addition, a system known as pitch trim can be changed to prompt nose-up or nose-down movement. That case didn't involve the angle-of-attack system. In the early days of the jet age, the elevator trim system was linked to several accidents.

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