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

So, it wasn’t just Boeing who l knew there were problems with the poorly designed 737 MAX planes. And nobody in a position of responsibility and authority thought to make sure the “fixes’ that were vital for the safety of those that fly the ‘friendly’ skies were adhered to. But when you’re the manufacturer AND have the final word on safety compliance you get to decide what’s most important, passenger/crew making a few extra bucks on charging extra for sensors that keep the plane from crashing.

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

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.

Those situations, however, were not listed in the flight manual, according to a copy from American Airlines seen by Reuters.

The undated EASA certification document, available online, was issued in February 2016, an agency spokesman said.

It specifically noted that at speeds greater than 230 knots (265mph, 425kph) with flaps retracted, pilots might have to use the wheel in the cockpit’s center console rather than an electric thumb switch on the control yoke.

EASA and the U.S. Federal Aviation Administration (FAA) ultimately determined that set-up was safe enough for the plane to be certified, with the European agency citing training plans and the relative rarity of conditions requiring the trim wheel.

In the deadly Lion Air crash in October, the pilots lost control after initially countering the Maneuvering Characteristics Augmentation System (MCAS), a new automated anti-stall feature that was pushing the nose down based on data from a faulty sensor, according to a preliminary report from Indonesian investigators released in November.

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.

https://reut.rs/2OynWth

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Raggedy Ann's picture

instrument brought to you by the 1%. Pleasantry

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"The “jumpers” reminded us that one day we will all face only one choice and that is how we will die, not how we will live." Chris Hedges on 9/11

WaterLily's picture

@Raggedy Ann

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WaterLily's picture

Under the circumstances, Boeing’s best option was to just take the hit for a few years and accept that it was going to have to start selling 737s at a discount price while it took the time to design a whole new airplane. That would, of course, be time-consuming and expensive, and during the interim they’d probably lose a bunch of narrow-body sales to Airbus.

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