You might be onto something. I went and took a look at the the Lion air data: https://spectrum.ieee.org/image/MzE4Mjg2OQ.jpeg https://spectrum.ieee.org/image/M

You might be onto something. I went and took a look at the the Lion air data: https://spectrum.ieee.org/image/MzE4Mjg2OQ.jpeg https://spectrum.ieee.org/image/MzE4Mjg2OQ.jpeg They were successfully doing trim up commands for at least 21 cycles to counter the MCAS trim down commands. Then after the last few activations, they try pressing trim up again, but the button presses are shorter and the stabiliser barely moves up. Did MCAS push the stabiliser down past a point the aerodynamic forces were so strong that even the electric trim motor was having problems trimming up? That could explain why the last 4 trim up commands were so short, if the pilots heard a large electric motor stuck noise they might have stopped holding the button.