Appears to be a series of test flights.
M5998 - LUFTWAFFE JU88 FACTORY AIRCRAFT LOGBOOK. 325 A 1942 flight logbook containing approx 150 flight entries, all for the Junkers JU88 bomber, undertaken by flight crew for the Junkers factory at Leipzig and appear to be test flights all departing and returning to the Junkers airfield at Leipzig, the aircraft are all listed with their werk numbers so could be researched, many different names are down as pilot which denotes this person was something other than a pilot, most are short duration flights, some at night, at a couple of points the book has official stamps with tallies & comments as is usuual in luftwaffe flight logs and one has the Junkers full factory stamp. There is also a separate sheet of paper with another 7 flights logged during 1941, with official stamp and interesting as aswell as werk numbers the aircraft codes are listed too, there is a last sheet with 4 tables for 4 different junkers aircraft consisting of minutes 10 to 60 and distance in KM for each minute, so the 60 will show the KM per hour for each one, as the werk numbers are all odd, some low, some high it appears likely these were test flights by the factory after aircraft had been in for overhaul, interesting and unusual.
Source:
http://www.tigercollectibles.co.uk/o...ogue.aspx?id=J
Usual disclaimer,
Ed