Lion Air Flight 610 crashed off the coast of Indonesia last October, killing 189 people. Indonesian officials believe the failure of a sensor may have triggered an automated software system designed to prevent the plane from stalling. However, the system may have brought the plane down as pilots struggled to override it.During the recent tests, the simulator pilots found they had mere seconds to shut down the system and prevent the plane going into a nosedive, the Times said, citing two unnamed people involved in the tests. The system, known as MCAS, "as originally designed and explained, left little room for error," according to the report. "Those involved in the testing hadn't fully understood just how powerful the system was until they flew the plane on a 737 Max simulator," the Times reported.At least some of the tests described by the Times took place over the weekend, the paper reported.On Saturday, pilots and training officials from Southwest Airlines, American Airlines and United Airlines met with Boeing officials to review updated software for 737 Max planes in the Seattle area, where the model is assembled, multiple airline sources told CNN on Monday. The software updates are intended to decrease the chances of triggering the MCAS system.737 pilots trained for Max 8 with short online courseThe pilots ran simulated flights using the current and updated software, one of the sources told CNN, adding that each flight landed safely.MCAS is a key focus of the investigations into the Lion Air disaster and the crash of an Ethiopian Airlines Boeing 737 Max 8 flight on March 10 that killed all 157 people on board. Both jets crashed minutes after takeoff, and in both cases the pilots reported problems minutes into the flights.Pilots transitioning to the Boeing 737 Max 8 aircraft from older 737 models were given a short, self-administered online course that made no mention of the new system, pilots' unions spokesmen for two American carriers told CNN.During the Lion Air flight's last minutes, pilots searched in a handbook for a way to stop the plane from nosediving, according to a Reuters report.The Trump administration grounded all Boeing 737 Max planes indefinitely three days after the Ethiopia crash, and after the rest of the world had already done the same.In a statement Sunday, Boeing called the weekend meeting a "productive session" and said that it had invited more than 200 pilots and technicians, as well as regulators, to an informational session at the company's production facility in Renton, Washington, on Wednesday."This is part of our ongoing effort to share more details about our plan for supporting the safe return of the 737 MAX to commercial service," Boeing said.A Boeing 737 Max 8 parked at the company assembly plant in Renton, Washington.

Updated software required less intervention from pilots

In the simulations run over the weekend with the current MCAS software, the test pilots used existing procedures to disable the system, while test flights using the new soRead More – Source