Incident Overview
A twin-engine transport airplane sustained a collision with a helicopter's main rotor blade while being guided into a parking position on a ramp. The helicopter was stationary and parked with its rotor blades aligned along its longitudinal axis. At the time, the helicopter was being boarded by passengers.
Ramp Personnel and Positioning
Four ramp personnel were involved in the operation. Three were assigned to the airplane, with one positioned at the nose and one at each wing. The fourth ramp person was assisting the helicopter. According to the helicopter's ramp assistant, he escorted passengers to the helicopter, after which the pilot loaded them and closed the door.
Sequence of Events
As the airplane was marshaled into the ramp, its cockpit passed abeam the helicopter. At that moment, the airplane's captain observed the helicopter's main rotor blades beginning to rotate. The first officer, noticing the proximity between the airplane's right wing and the helicopter, became concerned. However, the right wing walker gave a "thumbs up" signal indicating clearance. Subsequently, the main rotor blade struck the airplane's right wingtip.
Aftermath
The collision resulted in damage to the airplane's wingtip from the helicopter's rotor blade. Specific details regarding injuries, damage extent, or other consequences are not provided in the source.