Fokker Dr.I 404/17

Image # 84, Preparing Haumptmann von Tutschek's 404/17 for flight. The mechanic standing on the right-hand wheel, apparently checking the oil tank filler cap for security, is Unteroffizier Balzer. Being in charge of the Kommandeur's aeroplane, he is also no doubt keeping an eye on the mechanics in the cockpit who, having lifted the Kastendeckel (breach cover) of the right-hand gun to gain access to its bolt mechanism, is obviously from the Waffenmeisterei. The internal moving parts of the LMG 08/15 required frequent lubrication, but the grease and oil for ground weapons had little application in aerial use and a special oil with low freezing point (MG Oel 16) was used.  ("The Fokker Triplane" by Alex Imrie pg.60, Arms And Armour)

Fokker Dr.I 404/17, wn 1988, the triplane of Hptm Adolf Ritter von Tutschek bearing his leader's streamers attached to its struts. the mechanics are working on the guns, possibly loading them. (Peter Grosz)  ("Fokker Dr.I Triplane" A World War One Legend by Paul Leaman, Pg.157, Air War Classics)