Incident Overview
A helicopter encountered a sudden vibration while flaring to land on an offshore platform. The pilot continued the landing approach. As the helicopter touched down, the vibration intensified to a severe level, and the aircraft yawed to the right. During the subsequent reaction to the emergency, the bottom vertical fin made contact with the edge of the platform.
Examination Findings
A post-incident inspection revealed that a midspan balance weight had separated from one of the main rotor blades. The affected blade was identified by part number 206-010-200-33. No further details about the condition of the blade or the weight were provided.
Operational Context
The event occurred during a landing maneuver on an offshore platform. No information was given regarding the helicopter type, registration, number of occupants, or any injuries. The time of day, weather conditions, and air traffic control involvement were not specified.
Additional Notes
The source material did not state a probable cause for the incident. The separation of the balance weight and the subsequent fin contact are documented as observed facts without attribution to any underlying factors.