INSIGHT-Regulators knew before crashes that 737 MAX trim control was confusing in some conditions - document

U.S. and European regulators knew at least two years before a Lion Air crash that the usual method for controlling the Boeing 737 MAX's nose angle might not work in conditions similar to those in two recent disasters, a document shows. The European Aviation and Space Agency (EASA) certified the plane as safe in part because it said additional procedures and training would "clearly explain" to pilots the "unusual" situations in which they would need to manipulate a rarely used manual wheel to control, or "trim," the plane's angle. The undated EASA certification document, available online, was issued in February 2016, an agency spokesman said.

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