Accident Jodel D-9 HB-SUN, Wednesday 30 August 1961
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Date:Wednesday 30 August 1961
Type:Silhouette image of generic d9 model; specific model in this crash may look slightly different    
Jodel D-9
Registration: HB-SUN
MSN: 73
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Oberwil -   Switzerland
Phase: En route
Departure airport:Dällikon Airfield
Destination airport:Lachen
Investigating agency: BFU Switz.
Confidence Rating: Accident investigation report completed and information captured
The pilot took off from the airfield Dällikon in fine weather for a private flight to Lachen. On the way, around 18:30, at an altitude of 200-300 m above the hamlet of Lieli-Oberwil, the propeller broke away from the aircraft. During the emergency landing, the aircraft overturned and was severely damaged; the pilot was uninjured.

The accident was caused by fatigue fractures in the propeller mounting, caused by stresses not foreseen in the design due to a drop in the pretension of the structurally unsound mounting bolts, partly due to the installation of a structurally inadequate and untested propeller cowl and due to the failure to carry out adequate checks during maintenance.

Accident investigation:
Investigating agency: BFU Switz.
Report number: 
Status: Investigation completed
Download report: Final report


BFU Switzerland

Revision history:

06-Jul-2009 03:27 VHKDK Added

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