Boeing Believed a 737 Max Warning Light Was Standard
> But months after the planes were flying, company engineers realized that the warning light worked only on planes whose customers had bought a different, optional indicator.If I am to read this correctly, the angle-of-attack disagree light is installed on all Boeing 737-MAX aircraft.  For customers who did not buy on optional additional indicator, the angle-of-attack disagree light was always off, even if there is a disagreement between to sensors of the angle of attack of the aircraft.Doesn't this seem dangerous in-and-of itself?  If a pilot assumes that the light is off because there is not a disagreement, instead of because there is no information available, she is acting on incorrect information, and might try to address problems unrelated to the actual problem.Also, pilot may switch aircraft and expect the same functionality of safety features and may make incorrect assumptions about the functioning of this light.