[salawat]

The problem occurred in that that sensor had a privileged (unoverridable) pipeline to the horizontal stabilizer.

The pilots knew something was going wrong. That wasn't the issue. The issue was that the bloody thing could mistrim the plane to the point of nigh irrecoverability, and no one knew enough about it until two planes full of people plunged out of the sky.

The plane may be able to fly just fine; but the way this thing was developed and brought into mainstream use had critical problems in terms of essential information being communicated.

All the decisions and motivations behind these lack of communication have to some point been traced back to trying to circumvent regulations in order to prop up share price by scoring sales of a new airframe of comparable efficiency to the a320neo.