Investigation Summary
The flight was a non-scheduled charter originating in Riga, with stops in Prague and Altenrhein, intended to conclude in Paris. On board were the pilot, two businessmen, and two barmaids. One of the passengers, Josef Rimmele, was reportedly wanted by German authorities for fraud, while another, Klaus Eichler, was a former East German official. These backgrounds, combined with allegations of past dealings in radioactive materials, led to a 'nuclear scare' that dominated European media for weeks. The Swiss, German, and Austrian authorities were particularly concerned about potential contamination of the Lake Constance water supply, which serves millions of people. Recovery efforts were hampered by poor weather and the extreme depth of the lake. The recovery operation began on February 7, 1994, and the aircraft was successfully raised on February 8. Investigators found one of the cabin doors open. Only three bodies were recovered from the wreckage; the pilot, one female passenger, and a dog remained missing and are presumed dead. Technical analysis of the wreckage revealed that the flaps were in the neutral position, which was considered highly unusual for an aircraft on final approach for landing. No evidence of nuclear material or hazardous cargo was found during the post-crash inspection.
Final Conclusions
The investigation conducted by the Swiss authorities (with BFU involvement) concluded that the exact cause of the accident could not be determined. The aircraft experienced a rapid and unexplained loss of altitude during the final approach phase. The neutral position of the flaps at the time of impact suggested the aircraft was not in a standard landing configuration, but no definitive mechanical failure or pilot action was identified to explain the descent into the water.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Systems & Failure Modes
Flaps
Found in the neutral position, suggesting the aircraft was not configured for landing at the time of impact.
Cabin Door
One door was found open, leading to speculation about whether it was opened before or during the impact sequence.
Interesting Facts
- 01The wreckage was recovered from a depth of 160 meters.
- 02Flaps were found in the neutral position, which is inconsistent with a normal landing approach.
- 03One aircraft door was found open when the wreckage was recovered.
- 04Extensive testing confirmed no nuclear or radioactive material was present on the aircraft.
- 05The crash site location in Lake Constance raised complex jurisdictional questions due to unclear international borders in the water.
Safety Actions & Advisories
Jurisdictional Clarification
Source ↗The crash highlighted the lack of formal border definitions in Lake Constance. Legal scholars and constitutional experts used the case to advocate for clearer international agreements regarding criminal jurisdiction in the lake's waters to prevent future legal ambiguity.
Known Controversies & Unanswered Questions
Nuclear Material Allegations
Reference ↗Widespread media reports suggested the flight was smuggling nuclear material from Eastern Europe. Post-recovery inspections by authorities found no evidence of radioactive substances.
Jurisdictional Ambiguity
Reference ↗The crash occurred in a part of Lake Constance where international borders between Switzerland, Germany, and Austria are not formally defined, leading to legal debates regarding court jurisdiction.