A year before the plane was finished, Boeing made the system more aggressive and riskier. But many people involved in building, testing and approving the system, known as MCAS, said they hadn’t fully understood the changes. Current and former employees at Boeing and the Federal Aviation Administration who spoke with The New York Times said they had assumed the system relied on more sensors and would rarely, if ever, activate. Based on those misguided assumptions, many made critical decisions, affecting design, certification and training. “It doesn’t make any sense,” said a former test pilot who worked on the Max.

Source: New York Times June 01, 2019 16:47 UTC