D-ATRA For three days "ATRA", the research A320 of DLR, was conducting new approach procedures at FRA, analyzing the optimum moment for extending flaps and lowering the gear. It flew around 30 circuits per day but pulled up high again on most of them, so I never got a regular approach shot. With the low evening sun, at least this nice clear view of its underside was possible. Note the red rudder surfaces. (mehr von D-ATRA)