Actually Tim that is what happened. I am not going to give the name of the shop since they are a very good and well known shop. I have done business with them. If anybody needs to know they can PM me.
The tech was working under the panel on the pilots side. The seat was not removed so you can imagine the contortions he had to use. Also this tech is on the "healthy" side. Power cart was hooked up for the various testing that was going on. As any body that has done any of this work knows that the tech/mechanic will normally push the controls forward out of the way including the condition levers.
The tech is under the panel unplugging an instrument to be removed. As he is removing it, it slips from his hand and falls straight down. It has been a while since I have been in the left seat of a 90 but as I recall the start/ignition switches are down low to the left of the column. The switches (as I remember) have a starter position that is up, center off and down is start/ign.
Remember the levers are all forward including the condition levers. The instrument falls from his hand striking the right engine start/ign switch defeating the detent and going into start/ign. The tech hears the engine spooling as he is scrambling to get out from under the dash. Engine lights off and is rapidly increasing. Tech is not a pilot and it takes him a few seconds to figure out how to get the condition levers over the detent. The result is what you see. Engine over torqued to the extent it was throwing parts out of the PT section and /or gearbox. The engine is pulled loose from the engine mounts. Numerous work tables are now kindling or scrap metal. There are multiple holes in the roof and the KA has holes into the pressure vessel. I think this happened Monday. Nobody was hurt. What a day!!