The Boeing 737 Max's MCAS anti-stall software was designed to rely on data from two types of sensors, one of which was later removed undisclosed to regulators (New York Times)

New York Times:
The Boeing 737 Max's MCAS anti-stall software was designed to rely on data from two types of sensors, one of which was later removed undisclosed to regulators  —  SEATTLE — The fatal flaws with Boeing's 737 Max can be traced to a breakdown late in the plane's development, when test pilots …