The majority of Boeing 737 MAX aircraft had a non-working alert for faulty sensor data. Two Boeing 737 MAX airliners operated by Lion Air and Ethiopian Airlines crashed five months apart, killing a total of 346 people, and leading to a worldwide grounding of the new model. Pilots were supposed to be alerted about possible problems with the sensors by an AoA Disagree alert, which should light up when data coming from two AoA sensors does not match. Boeing first informed the FAA about the faulty alert after one of the planes crashed. The Lion Air aircraft, however, narrowly avoided a similar incident a day before its final demise thanks to an off-duty pilot who was in the cockpit and instructed the crew to turn off the anti-stalling system.

Source: Ethiopian News June 08, 2019 09:54 UTC