Incident Description
An aircraft experienced a loss of power shortly after takeoff at an altitude of approximately 400 ft above ground level. The pilot executed a forced landing in a soft plowed field. During the landing, the nose gear collapsed.
Post-Accident Examination
Following the accident, a detailed examination of the aircraft was conducted. The inspection revealed several fore and aft diagonal wrinkles in the rubber bladder type fuel tanks. The fuel screen assembly was found to be approximately two-thirds full of a milky white substance. Additionally, the carburetor bowl was about half full of a substance described as white or clear.
Aircraft Status
The aircraft was being returned to its owner by an A&P (Airframe and Powerplant) mechanic after completion of an annual inspection.
Probable Cause
No probable cause was determined based on the available information.