Article is behind a paywall unfortunately. Any help? :)
‘A simulator session flown by a U.S.-based Boeing 737 MAX crew that mimicked a key portion of the Flight 302 accident sequence suggests that the crew faced a near-impossible task of getting their 737 MAX back under control, and underscores the importance of pilots understanding severe runaway trim recovery procedures.’
‘What the U.S. crew found -. Keeping the aircraft level required significant aft-column pressure by the captain, and aerodynamic forces prevented the first officer from moving the trim wheel a full turn. They resorted to a little-known procedure to regain control.’ (YoYo Roller Coaster)
The excessive descent rates during the first two steps meant the crew got as low as 2,000 ft. during the recovery.
...
‘The simulator session underscored the importance of reacting quickly to uncommanded stabilizer movements and avoiding a severe out-of-trim condition, one of the pilots involved said. “I donʼt think the situation would be survivable at 350 kt. and below 5,000 ft,” this pilot noted.’
“This is the sort of simulator experience airline crews need to gain an understanding of how runaway trim can make the aircraft very difficult to control, and how important it is to rehearse use of manual trim inputs,”
[1] https://www.pprune.org/rumours-news/621478-ethiopian-max-cra...
You unload the stabilizer by pitching down for a few seconds so that you can trim it back somewhat.
However, that is not something you can do close to the ground (you lose altitude, obviously) and the "vomit comet" ride won't be appreciated by the passengers neither.
If I remember correctly, this procedure was specifically described in older 737 manuals, but had been dropped more recently.
https://www.youtube.com/watch?v=aoNOVlxJmow
It is not MAX but the systems are identical.
That's why it is so essential to recognize and stop the runaway trim (for whatever reason) ASAP or you could get into a situation where it would be physically impossible for the crew to do so.
https://theworldnews.net/us-news/ethiopian-max-crash-simulat...
The original link seems dead.
edit: nope, my link is no good either.
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