Fruitloop how about a leading edge on the h-stab, or any part of the interior. I think the interior was designed by three diferent people who didn't talk to each other, as the bulkheads are all diferently secured. Also they had lousy engines. Bae stood for bring another engine. But the old 146 was a solid machine.
Ever change an APU in a Dash 8, or elevator trim cable.
Bleed air duct in a F-28. Rig flaps in an F-28 can not be done by the book. You will never get the cable tension within limits.
But the real lousy job I have had to do a few times is change a twin pack in a Bell 212/412. What were they thinking?
How about the airstair in a 737. Not fun. Changing bladder tank in a 727-100, could be the death of someone.