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Ethiopian Airlines flight’s stall-prevention software was active at crash, CEO says
The chief executive of Ethiopian Airlines told the Wall Street Journal in an interview published today that he had reason to believe that software intended to prevent Boeing 737 MAX aircraft from stalling in flight had been activated aboard Ethiopian Airlines Flight 302 shortly before its crash. CEO Tewolde Gebremariam said that “to the best of our knowledge,” the Maneuvering Characteristics Augmentation System (MCAS) for stall prevention was active at the time of the crash. (arstechnica.com) Más...Sort type: [Top] [Newest]
In the aircraft manual of the 737 Max stated by a Canadian aviation lawyer there is no mention on how to turn off the MCAS since it never mentions that it exists and how it works. Boeing hid this from the pilots at least in Canada. At night a plane suddenly starts to dive is quite a complicated situation if you are not expecting it. I am sure all piloits agree.
I do not agree.
You don't agree that unexpected major trim, with nose down attitude, can be overwhelming if you don't anticipate or expect it?
It’s easy to say you don’t agree when you have never been in that exact situation. He is an idiot that probably thinks he can handle anything!!
How did the crews know they were fighting trim? Did each know the MCAS was on the plane and moving the horizontal stabilizer? Did the MCAS movement mimick runaway trim?
There are two wheels mounted on the center console, one each for the left and right seat pilots, that turn when the trim is changing. They are a dark color with white markings, so one can visually see it turning. They turn when either pilot uses the thumb switch to adjust trim and when an automated system adjusts trim. Furthermore, when electric trim is shut off with two switches, each wheel has a handle that can be popped out, and those wheels can be turned manually to adjust trim.
See this video that includes time in a 737 simulator to see them in action (specifically watch starting around 4:20):
https://www.youtube.com/watch?v=TlinocVHpzk
See this video that includes time in a 737 simulator to see them in action (specifically watch starting around 4:20):
https://www.youtube.com/watch?v=TlinocVHpzk
My understanding is that there are two switches to cut off MCAS both located together at the central control panel (near the throttles) so that captain and FO can access them very easily.