Incident Overview
Shortly after departure, the pilot encountered a severe vibration throughout the aircraft. Upon retarding engine power, the vibration subsided. Subsequently, the pilot noted aileron control difficulties and observed the left wing tip moving up and down. An emergency landing was performed in a field.
Investigation Findings
Post-incident examination revealed that both ailerons had overtraveled and were bent. The left wing main structure was found to be fractured, although it had not separated from the aircraft. Line service personnel reported that the aircraft had departed with one-half inch of solid ice on the top surfaces of the wing.
Operational Context
The presence of ice on the wing surfaces prior to departure was documented by ground crew. The specific conditions leading to ice accumulation were not detailed in the report. No information was provided regarding aircraft type, registration, engine count, date, operator, location, occupant count, injuries, time of day, or weather characterization.