Sensor in Lion Air 737 Max Crash Was Repaired the Day Before

By Anna Breuer on 3 April 2019
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IMGP4628The faulty angle-of-attack sensor on a Lion Air Boeing 737 Max that was linked to its crash on October 29 was repaired the day before the crash by a Florida aircraft maintenance company.

Lion Air Flight 610 was en route from Jakarta to the city of Pangkal Pinang on the island of Bangka when crashed into the Java Sea.

Investigators in Indonesia and the United States are looking into the work performed by the Florida company, XTRA Aerospace, according to a report prepared for Indonesia’sparliament.

The story was first reported by Bloomberg News.

While the Lion Air crash did not prompt any action by regulators about the Boeing 737 Max, a second crash, this one of an Ethiopian Air in March prompted the worldwide grounding of the type.

Data retrieved from the flight data recorder of the Ethiopian Airlines Boeing 737 showed similarities to data from the Lion Air flight that crashed in Indonesia.

The angle of attack sensor was made by Rosemount Aerospace, a subsidiary of United Technologies.  The aircraft’s Maneuvering Characteristics Augmentation System, or MCAS, which automatically takes over if an aircraft’s nose suddenly rises in a way that could lead to stalling, uses it.  Boeing is redesigning the MCAS to read information about the aircraft’s angle of attack from multiple sensors instead of just one.

With the changes, the system will compare readings from two sensors that monitor the plane’s forward attitude. If the sensors disagree by 5.5°, the system won’t activate but will instead activate a warning to alert pilots.

(Photo: Accura Media Group)

Accura News

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