The first flight, flown by the testpilot Joachim von Köppen, took place on the 20th April 1934. During those first flights it became clear that it was an impressive aircraft and had excellent performance and flight properties. With 80 HP it was a bit underpowered but despite that the flight characteristics were overwhelming. An other point was the low fuel consumption, the easy maintenance and the low purchase price. The aircraft had been developed as a basic trainer and had incredible aerobatic qualities.Already in 1935 the first aircraft had been delivered abroad. Switzerland ordered three aircraft and had been granted the licence to build those on their own. The Swiss Airforce used those aircrafts until 1974 as a basic trainer for their studentpilots. The last original Bü- 131 had been build in the mid 60s in Spain, a CASA 1.131.
Of the approximately 5000 build airplanes, only nearly 200 of these Jungmanns still exist worldwide. From 1994 on, a small company in Poland, the H.A.S. from Jasienica started to build the Bucker again. 28 planes were build in total and production ended 2006 after the death of the company founder Janusz Karasiewicz. But this was not the end. Another company from Poland, Air Res Aviation form Rzeszów/ poland, bought the licences and plans from Janusz widow and restarted the production. The first aurcraft had its maidenflight in december 2012 and 2 more are in production right now.