A second electronic system found on other Boeing jets also pilots to unusual or hazardous situations during flight and lays out recommended steps to resolve them. On 737s, lightly indicates the problem and pilots have to flip through their paper manuals to find next steps. In the doomed Indonesia flight, as the Lion Air pilots struggle with MCAS for control, the pilots consulted the manual moments before the jet plummeted into the Java Sea, killing all 189 people.
"Meanwhile, I'm flying the jet , ”Said Mr. Tajer, the American Airlines 737 captain. “Versus, pop, it's on your screen. It tells you, This is the problem and here's the checklist that's recommended. ”Boeing decided against adding to the Max because it could have prompted regulators to require new pilot training, according to two forms Boeing employees involved in the decision.
In recent crashes, investigators believe the MCAS malfunctioned and moved a tail flap called the stabilizer, tilting the plane toward the ground. On the doomed Ethiopian Airlines flight, the pilot tried to combat the system at the power of the stabilizer's engine, according to the preliminary crash report.
Once the power was cut, the pilots tried to control manually by turning a wheel next to their seat. The 737 is the last modern Boeing jet that uses a manual wheel as its backup system. But Boeing has long known that turning the wheel is difficult at high speeds, and may have required two pilots to work together.
to the preliminary crash report. About 1 minute and 49 seconds later, the plane crashed, killing 157 people.