Hi Alain57,
Most of the losses of Fl.U.G. 1 can be found the the "Schulen, etc." loss files of RL 2-III online at the Bundesarchiv site. However, only three have been posted so far --- but you lucked out! This loss is found in RL 2-III/784, page 0122, #17. Here is a copy of that page,
http://forum.12oclockhigh.net/album....pictureid=1441
best regards,
Jim