A new statement from Boeing has indicated that the aerospace manufacturer knew about a problem with the 737 MAX aircraft well before the deadly October 2018 Lion Air crash in Indonesia killing 189 people, but decided not to do anything about it.
But the statement released on Sunday describeed a troubling timeline that shows how long some at the company were aware of the problem before finally deciding to act.
Boeing maintained that the software issue "did not adversely impact airplane safety or operation".
But the disagree alert could have notified pilots that a sensor was malfunctioning. In both disasters, preliminary investigations suggest faulty data from a malfunctioning angle of attack (AOA) sensor triggered the aircraft's anti-stall software, known as MCAS, which pitched down the nose of the planes as pilots struggled for control.
Neither the FAA or Boeing interfered with the fleet's operations until the Ethiopian Airlines crash.
The crashes led to the grounding of the 737 MAX jets worldwide, while Boeing continues working to fix the problem.
Boeing said it was issuing a display system software update "to implement the AOA Disagree alert as a standard, standalone feature before the MAX returns to service".
"When the MAX returns to service, all MAX production aircraft will have an activated and operable AOA Disagree alert and an optional angle of attack indicator," the company said.
"All customers with previously delivered MAX airplanes will have the ability to activate the AOA Disagree alert."
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)