What happened
During a scheduled flight to verify recent maintenance work, a twin-engine aircraft went down in Tokyo Bay. The flight was being operated by a crew consisting of two pilots and two technicians. Following the impact with the water, the aircraft sank and was subsequently lost.
All four occupants on board the aircraft perished in the accident. At the time of the crash, the flight was in the process of conducting post-maintenance testing operations.
Findings
The specific reasons for the crash remain undetermined, as the circumstances surrounding the descent into Tokyo Bay are currently unknown.