What happened
On June 9, 2012, a Robinson R44 Raven I helicopter was performing a flight from Worms to Salzburg via Augsburg. The pilot was accompanied by three passengers. During the flight, the pilot established radio contact with Salzburg Tower and was instructed to fly to the Teisendorf reporting point. However, the pilot deviated from the assigned course, turning south toward the A8 motorway near Traunstein.
As the aircraft proceeded along the motorway at a low altitude, it encountered deteriorating weather conditions caused by a passing cold front. The aircraft flew at approximately 80 KIAS, following the motorway through low-hanging clouds. Eventually, the helicopter entered thick cloud cover over rising terrain. At approximately 17:11, the aircraft struck trees in a wooded area near the Teisenberg, resulting in the destruction of the helicopter and the deaths of four people.
The investigation
The BFU investigation examined the pilot's experience, the aircraft's maintenance history, and the meteorological conditions at the time of the accident. The pilot was relatively inexperienced, with approximately 87 total flight hours and only 13 hours of experience on the R44 model. This was his first flight as the pilot-in-command on this specific aircraft type.
The investigation also reviewed radar data, radio communications, and onboard video footage. The footage confirmed that the helicopter was flying at a low altitude and entered the clouds approximately 1,100 meters before the impact site. Meteorological analysis from the German Weather Service (DWD) confirmed that a cold front was bringing rain and lowering cloud ceilings in the area, which led to the low visibility observed by rescue crews arriving later.
Findings
- The pilot's flight experience and situational awareness were insufficient to manage the increasing workload and deteriorating weather.
- A navigation error occurred when the pilot turned south toward the A8 instead of maintaining an eastward course toward the assigned reporting point.
- The pilot continued the flight into low clouds and rising terrain despite having sufficient fuel to divert or perform a safety landing.
- The primary cause of the accident was the continuation of flight at a low altitude over rising terrain without visual reference to the ground.