Sorry Dave, haven't learnt to read to the bottom of the page...First aircraft I worked on that had yaw dampers fitted as standard kit was a 737-200. Belonged to a company called, er, some time ago, NAC! Unfortunately I am stuck behind a computer these days, and do all my engineering with a keyboard, and all the nice weather is outside the window. Weekends, of course, is reserved for all the other weather we didn't get all week. Leaves a bit of time for buiding, but.
Evan.