1940 Deutsche Lufthansa Ju 90 crash

The aircraft, registered D-AVMF and named Brandenburg, took off from Berlin Tempelhof Airport at 14:24 with 23 passengers and six crew members. The radio operator contacted ground at 14:48, indicating that they were flying at 2,200 m (7,200 ft) in clouds. Two minutes later, he reported icing.^[3] After a final call from the aircraft at 14:58, there was no further communication from the aircraft.^[3] The Ju 90 started descending and crashed into a field. The German musician and journalist Adolf Raskin was killed in the accident.^[4]

A post-crash of the aircraft's on-board clock revealed that the crash occurred between three and five minutes after the final communication from the aircraft.^[3] Witnesses reported observing the aircraft flying at 300 metres (980 ft) or less for two to three minutes shortly before the crash, investigators concluded that the decent from 2,200 metres (7,200 ft) must have occurred very rapidly, and concluded that the descent was uncontrolled. Ice was found on the aircraft that was more than 1.5 to 2 centimetres (0.59 to 0.79 in) thick, which would have critically altered the flight characteristics of the aircraft. In instances in the type of aircraft, severe ice accumulation had been found to jam the elevators between the tail fin end cap and the outer balancer. Investigators found dents on the tail fin end cap, as well as a sheared rivet between the outer balancer and the drive shaft, which led them to conclude that the elevator control had been jammed during flight. On the other hand, the damage was also suspiciously similar to that caused by a foreign object, that was never discovered.^[3]

51°16′52″N 14°02′24″E / 51.2810°N 14.0400°E / 51.2810; 14.0400