Incident Summary
The pilot of a helicopter reported that after landing and while shutting down the engine, another helicopter from the same company landed approximately 40 to 50 feet away at the 2 o'clock position. The vortices generated by the main rotor blades of the landing helicopter caused the main rotor blades of the stationary helicopter to flex downward. This downward flexing resulted in the blades impacting the tailboom of the stationary helicopter, leading to substantial damage.
Sequence of Events
According to the pilot's account, the incident occurred just after landing. The engine shutdown procedure was in progress when the second helicopter, also operated by the same company, touched down nearby. The positioning of the landing helicopter relative to the stationary one was at a 2 o'clock direction, with a distance of about 40 to 50 feet.
The rotor wash and vortices from the landing helicopter's main rotor blades affected the stationary helicopter's rotors, causing them to deflect. The flexing was sufficient to bring the blades into contact with the tailboom structure.
Damage Assessment
The impact between the main rotor blades and the tailboom resulted in substantial damage to the stationary helicopter. No further details on the extent of the damage or any other consequences were provided in the source.