Originally Posted by
spornrad
Therefore, I do believe, that the ergonomics of the yoke with shaker and high feel forces can make it difficult to actuate the thumb switch continuously. Maybe they had to cradle the column for prolonged high force, hands not in standard position.
I think we can agree that it is easier to hold the trim switch with the stick shaker off. Nonetheless, the data shows clearly that the thumb switch can be held closed with the stick shaker on.
If you look closely at the FDR traces, the Lionair captain who faithfully trimmed back up umpteen times did loose the trim switch ever now and then. There are off-blips in almost every long nose-up trim command.
But the Lion Air data also shows "off-blips" during
automatic trim every now and then, so based on that you can't attribute it to the thumb switch. Also, none of these "off-blips", as you call them, appear on the ET302 data which suggests they have more to do with how the two different investigations have processed the data into the graphics we see..
Try thumb typing on your phone after you attached a 50 pound brick, while a friend is rattling it...
Because you really really believe that holding down the trim switch is like typing on a phone
