The lawsuit accuses the US aircraft manufacturer of failing to inform pilots and airlines of a feature with its new 737 Max plane system that could "push the nose down unexpectedly".

Investigators have been looking into reported technical issues.

Boeing maintains that it is "confident in the safety of the 737 Max".

Lion Air flight JT 610 was carrying 189 people when it crashed on 29 October.

It plummeted into the Java Sea following a request from the pilot for permission to turn back to the airport just moments after taking off from Jakarta.

It was later established that the aircraft had had an airspeed indicator problem on its final four flights.

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