 On 28 June 1912 "Schwaben" was destroyed in a hangar fire attributed to static electricity produced by its rubberised cotton gasbags, but was soon replaced by LZ 13 "Hansa", which was completed on 30 July.These airships were also used by the Imperial German Navy for crew training, with the Navy crews operating passenger flights.In 1913 LZ 17 "Sachsen" was added to the fleet.