JAKARTA (Reuters) – Mechanical and construct concerns contributed to the break of a Lion Air 737 MAX jet final October, Indonesian investigators told victims’ families in a briefing on Wednesday before the liberate of a final legend.

Family members of the victims killed in the break of Lion Air flight JT610 take a seat in the lobby of the Transport Ministry before the briefing to the families of victims on the final legend on the break in Jakarta, Indonesia, October 23, 2019. REUTERS/Sekar Nasly

Contributing components to the break of the brand new Boeing (BA.N) jet, which killed all 189 on board, included erroneous assumptions on how an anti-stall tool called the Maneuvering Characteristics Augmentation Blueprint (MCAS) functioned and how pilots would react, slides in the presentation showed.

The briefing slides additionally showed that a lack of documentation about how systems would behave in the break scenario, including the activation of a “stick shaker” tool that warned pilots of a unhealthy loss of make a selection, additionally contributed.

“Deficiencies” in the flight crew’s communication and handbook keep a watch on of the airplane contributed as well, the slides showed, as did signals and distractions in the cockpit.

The deficiencies had been “acknowledged throughout training,” the slides talked about, with out adding particulars.

Reliance on a single angle-of-assault sensor made the MCAS machine more at threat of failure, while the sensor on the airplane that crashed had been miscalibrated throughout an earlier repair, per the slides.

The final legend will likely be released on Friday.

A Boeing spokeswoman declined to touch upon the briefing, saying, “Because the legend hasn’t been formally released by the authorities, it is miles premature for us to touch upon its contents.”

A Lion Air consultant declined to comment.

The 737 MAX was grounded worldwide after a second deadly break in Ethiopia in March 2019.

U.S. planemaker Boeing is beneath growing stress to level to what it knew about 737 MAX concerns before the airplane entered service, particularly after a Reuters legend on messages from a worn test pilot describing erratic machine behavior on the 737 MAX jet two years before most up-to-date crashes.

Boeing has already talked about it can well redesign the anti-stall machine to depend on bigger than a single sensor and to attend minimize pilot workload.

The planemaker is made up our minds to liberate third-quarter financial results later Wednesday.


Contact with the Boeing 737 MAX jet was misplaced 13 minutes after it took off on Oct. 29 from the capital, Jakarta, heading north to the tin-mining town of Pangkal Pinang.

The airplane had suffered a sequence of concerns in cockpit readings since Oct. 26, culminating in a arrangement to alternate the angle-of-assault sensor before the penultimate flight from Denpasar to Jakarta.

All over the deadly evening-time flight, a “stick shaker” was vibrating the captain’s controls, warning of a stall throughout most of the 13 minutes aloft, per what investigators contain to maintain been deceptive files on its angle to the oncoming air.

That angle is a key flight parameter that must remain narrow adequate to again make a selection and steer toddle of an aerodynamic stall.

The airplane’s anti-stall machine persistently pushed the nose down, which is how pilots continually rating air beneath the wings.

Boeing was broadly criticized for inserting emphasis on piloting and repairs concerns in its public response to an earlier legend, sparking a infected dispute with Lion Air’s cofounder, Rusdi Kirana.

However it has since acknowledged that MCAS and a spoiled sensor played a characteristic, and apologized for lives misplaced with out admitting formal accountability.

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The planemaker final month settled the first claims stemming from the Lion Air break, a U.S. plaintiffs’ attorney talked about.

Three quite so a lot of sources told Reuters the families of these killed will rating no longer no longer as a lot as $1.2 million every.

The manufacturer faces simply about 100 proceedings over the Ethiopian Airlines break on March 10, which killed all 157 individuals on board the flight from Addis Ababa to Nairobi.

Reporting by Jessica Damiana and Bernadette Christina Munthe; Additional reporting by Jakarta bureau; Writing by Gerry Doyle; Bettering by Himani Sarkar and Clarence Fernandez