Apologies for resurrecting an old thread but I saw a YouTube video of this incident and the errors from design, regulator, pilots and maintenance are quite staggering.
How can it be OK to allow it to be possible to fit the trim switches upside down? Where was the function test after refitting it? Secondary inspection after disturbing flt control systems?
Unbelievable!
Then the pilot flying uses a system that was declared inoperable minutes before?