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by therealcamino
2447 days ago
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That's not consistent with other reporting. From the FT: https://www.ft.com/content/ee4246ea-5729-11e9-91f9-b6515a54c... Four seconds later — and only 35 seconds after the nose down problem first occurred — the co-pilot suggested they initiate the emergency procedure recommended by Boeing, and disable the MCAS system by flipping switches in the cockpit. “The pilots diagnosed and executed the procedure within 35 seconds — that’s lightning fast,” said Jason Goldberg, a spokesman for the pilots’ union of American Airlines, one of the biggest US operators of the 737 Max aircraft. |
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The flight data recorder showed that the pilots had successfully countered the MCAS input more than once with the electric trim switches. In the Lion Air crash, the pilots successfully countered it 25 times. At any one of those times, the pilots could then have turned it off with the cutoff switches. My source is Aviation Week, Aug 19, 2019.
It says: "Electric trim input will stop the automatic nose-down stabilizer movement" on a bulletin Boeing issued on Nov 6, and goes on to say "The only way to stop the cycle is to follow the runaway stabilizer checklist and toggle the console-mounted cutout switches."
This was apparently done by the previous Lion Air flight which encountered the same issue and landed safely.
The Ethiopian Air pilots also successfully used the electric trim switches to override MCAS. After two cycles of that, the pilots did think to throw the cutout switches, but with the nose down. They should have trimmed the plane to normal with the electric switches, then throw the cutout switches.
All according to AW, which I am much more inclined to believe than other reports, until we see the NTSB report.