Investigators scouring black-box data believe an automatic anti-stalling feature was engaged before a Boeing 737 Max jet crashed and killed 157 people in Ethiopia, an administration official said.
It was those two pieces of evidence that U.S. officials cited in grounding the planes, after most of the rest of the world had already done so.
The FAA directive said that if erroneous data is received by the 737 Max jet's flight control system, the plane's nose could be pushed down repeatedly. Failing to address that"could cause the flight crew to have difficulty controlling the airplane," pushing the nose down and leading to"significant altitude loss, and possible impact with terrain," according to the notice.
Boeing also issued a bulletin Nov. 6 that described how 737 Max pilots should override the automated system suspected of causing the Lion Air crash. By comparison, the Lion Air flight crashed 12 minutes after takeoff from Jakarta. It was supposed to reach a cruising altitude of 27,000 feet, according to the preliminary report, but the aircraft struggled to gain altitude, limiting the crew's room to gain control before the plane plummeted into the ocean at a reported 450 mph.
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