No fatalities

Seaplane Prototype Overturns on Lake Constance During Test Flight (D-ICDS)

Lake Constance, GermanyLanding (descent or approach)

On July 23, 1985, a Dornier Seastar CD.2 (registration D-ICDS) operated by Dornier Flugzeugwerke was involved in an aviation accident near Lake Constance, Germany during landing or approach. No fatalities were reported. Investigators recorded the probable cause as: The crew failed to raise the landing gear after takeoff. Upon landing on water, the landing gear struck the water surface first, causing the aircraft to overturn. Lack of crew coordination and failure of the crew to follow the pre-landing checklist. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 3 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Source recordUpdated 2026-07-04Data APIEditorial standards
Aircraft registered D-ICDS
Aircraft registered D-ICDS. Photo: wiltshirespotter / CC BY-SA 2.0, via Wikimedia Commons

During a local test flight on Lake Constance, a new seaplane prototype overturned upon landing, coming to rest upside down. Both pilots were injured. The aircraft was salvaged but damaged beyond repair.

Accident

On an unspecified date, a crew was conducting a local test flight on Lake Constance with a new seaplane prototype. During the landing sequence, the seaplane overturned and came to rest inverted. Both pilots sustained injuries. The aircraft was subsequently salvaged; however, it was determined to be damaged beyond repair.

Probable Cause

According to the official investigation, the probable cause of the accident was the crew's failure to raise the landing gear after takeoff. Upon landing on water, the extended landing gear struck the water surface first, causing the aircraft to overturn. Contributing factors included a lack of crew coordination and the crew's failure to follow the pre-landing checklist.

Frequently asked questions

What happened in the 23 Jul 1985 Dornier Seastar CD.2 accident near Lake Constance, Germany?

During a local test flight on Lake Constance, a new seaplane prototype overturned upon landing, coming to rest upside down. Both pilots were injured. The aircraft was salvaged but damaged beyond repair.

Were there any fatalities in the 23 Jul 1985 Dornier Seastar CD.2 accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 23 Jul 1985 involved a Dornier Seastar CD.2, registration D-ICDS, operated by Dornier Flugzeugwerke, at Lake Constance, Germany.

What was the probable cause of the accident?

The crew failed to raise the landing gear after takeoff. Upon landing on water, the landing gear struck the water surface first, causing the aircraft to overturn. Lack of crew coordination and failure of the crew to follow the pre-landing checklist.