Seattle - After two crashes of its 737 MAX 8 jets in less than half a year, the American manufacturer has been struggling to mitigate the safety concerns surrounding its new generation single-aisle planes.
But, things are not going well for Boeing. The manufacturer spotted an additional problem in the software of the 737 MAXs during the revision of the controversial Maneuvering Characteristics Augmentation System known as MCAS.
The problem is said to be independent of the updated anti-stall software.
The announcement came early on Friday. The Washington Post cited two sources familiar with the FAA investigation as saying that the problem was considered critical to flight safety.
Boeing described it as a "relatively minor problem".
The manufacturer also said it would be addressed along with the MCAS update and did not give details about the issue.
Boeing will submit its updated Flight Control software to the FAA for review in the coming weeks. It must be approved by the U.S. Federal Aviation Administration before implemented or presented to the other civil aviation regulators around the world for approval.
This week, the Agency has announced that it would establish a "Joint Authorities Technical Review Group" to review the updated software.
After the preliminary investigation report of the Ethiopian Flight 302, CEO Dennis Muilenburg acknowledged more clearly than ever before the problems with the MCAS.
Chief Executive said that the update to the system would ensure that accidents like those in Ethiopia and Indonesia will never happen again.