ET302 crash taking off

[IAHM-COL]

unsurprising, similarities...
https://www.cnn.com/2019/04/04/world/et ... index.html

This stuff in that article is nightmares' stuff

Recognizing a problem with the automatic trim, the pilots followed emergency procedures and turned off the system. Instead, the pilots tried to use the backup manual trim wheel to adjust the trim, but the airplane was traveling too fast and the manual trim wheel would have been physically impossible to operate, according to a 737 pilot who spoke with CNN.

In the final minute of the flight, the pilot told his first officer that they had to pull up together. Thirty-two seconds before the crash, both pilots tried to trim the nose up, and for a brief moment, the aircraft's stabilizer, controlled by the trim, made the corresponding change,
But five seconds later, the aircraft's automated systems once again trimmed the nose down, pitching the nose down even further, steepening the dive.

The plane was angled 40 degrees nose down, hurtling towards the ground at 575 miles per hour as it crashed.

[123apple]

Is the manual trim not connected by hydraulics? Or doesit have artificial feel?

Sounds like electric trim was re-enabled since manual trim didn't work either allowing MCAS to operate

[123apple]

Oh wow - according to an article I read (sorry, can't find the link again), the answer is in a procedure that was in the manual years ago for the -200 but was since removed.

The combination of full aft column and almost full nose down trim will result in extreme load on the jackscrew preventing it from moving easily. So in the -200 they developed a procedure where you release the column and trim rapidly, then pull the column again to stop the nose dropping and repeating until trim is normal. But that was removed many years ago.

So, think about the situation - the crew disconnect electric trim but due to nose down trim they can't climb but are holding back column. They can't manually trim due to high loads on the jackscrew. They're doing everything right - but something not described in the manual (again) prevents them from recovering the situation. So they reengage electric trim and MCAS pushes the nose down again making it impossible to recover.

Boeing has a lot to answer for if this is true.