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

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Regulators knew before crashes that 737 MAX trim control was confusing in some conditions: document
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U.S. and European regulators knew at least two years before a Lion Air crash tha...

SINGAPORE - 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 undated EASA certification document, available online, was issued in February 2016, an agency spokesman said. The flight conditions were similar to those described in the EASA document, a source at Lion Air said. The source said that training materials before the crash did not say the wheel could be required under those conditions but that Boeing advised the airline about it after the crash.

The trim system adjusts the angle of the nose. If the nose is too far up, the jet risks entering a stall. The trim wheel is a relic of the Boeing 737’s 1960s origins and does not appear in more modern planes like the 787 and Airbus SE A350. It is not often used, several current and former 737 pilots told Reuters.

After the third time MCAS forced the nose down, the first officer commented that the control column was “too heavy to hold back” to counter the automated movements, the preliminary report said. In a blog post on his personal website, former Boeing engineer Peter Lemme said that could make things harder for a pilot in a crisis.

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