Narrative:

I was flying an AS355 twinstar helicopter to help assist in sightseeing operations out of ZZZ heliport. I was parked on spot X. To my left and in front of me was a building and to my right in spot Y was another helicopter. After loading my passenger; I briefed them on safety and positioned my throttle into the flight gate. Once in a hover I matched torques on both engines and continued to lift to a higher hover and back out of my parking spot. I was keeping a close eye on my torques as I did not want to over-torque the aircraft and was also watching the building to my left. By being concerned about my torques I had forgotten about the helicopter parked to my left. I had believed my position to be higher and further back than it actually was and proceeded to make a left pedal turn into the wind. I then heard a small noise and knowing it didn't sound right; I straightened the nose and landed the helicopter. After the passenger were offloaded; I shut the helicopter down and realized my stinger had come into contact with the main rotor blades of the other helicopter. I believe the cause of the problem was not maintaining complete situational awareness. I was in a new aircraft and was heavy and taking off from a very tight spot. My concentration was too much on inside the helicopter and the building to my left that I had forgotten about what was to my right. I should have been more focused on the entire surroundings. In the future; I need to take the extra second and make sure every place around me is clear before moving the helicopter.

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Original NASA ASRS Text

Title: AS355 STRUCK THE ROTOR BLADES OF A PARKED HELICOPTER DURING TKOF.

Narrative: I WAS FLYING AN AS355 TWINSTAR HELI TO HELP ASSIST IN SIGHTSEEING OPS OUT OF ZZZ HELIPORT. I WAS PARKED ON SPOT X. TO MY L AND IN FRONT OF ME WAS A BUILDING AND TO MY R IN SPOT Y WAS ANOTHER HELI. AFTER LOADING MY PAX; I BRIEFED THEM ON SAFETY AND POSITIONED MY THROTTLE INTO THE FLT GATE. ONCE IN A HOVER I MATCHED TORQUES ON BOTH ENGS AND CONTINUED TO LIFT TO A HIGHER HOVER AND BACK OUT OF MY PARKING SPOT. I WAS KEEPING A CLOSE EYE ON MY TORQUES AS I DID NOT WANT TO OVER-TORQUE THE ACFT AND WAS ALSO WATCHING THE BUILDING TO MY L. BY BEING CONCERNED ABOUT MY TORQUES I HAD FORGOTTEN ABOUT THE HELI PARKED TO MY L. I HAD BELIEVED MY POS TO BE HIGHER AND FURTHER BACK THAN IT ACTUALLY WAS AND PROCEEDED TO MAKE A L PEDAL TURN INTO THE WIND. I THEN HEARD A SMALL NOISE AND KNOWING IT DIDN'T SOUND RIGHT; I STRAIGHTENED THE NOSE AND LANDED THE HELI. AFTER THE PAX WERE OFFLOADED; I SHUT THE HELI DOWN AND REALIZED MY STINGER HAD COME INTO CONTACT WITH THE MAIN ROTOR BLADES OF THE OTHER HELI. I BELIEVE THE CAUSE OF THE PROB WAS NOT MAINTAINING COMPLETE SITUATIONAL AWARENESS. I WAS IN A NEW ACFT AND WAS HVY AND TAKING OFF FROM A VERY TIGHT SPOT. MY CONCENTRATION WAS TOO MUCH ON INSIDE THE HELI AND THE BUILDING TO MY L THAT I HAD FORGOTTEN ABOUT WHAT WAS TO MY R. I SHOULD HAVE BEEN MORE FOCUSED ON THE ENTIRE SURROUNDINGS. IN THE FUTURE; I NEED TO TAKE THE EXTRA SECOND AND MAKE SURE EVERY PLACE AROUND ME IS CLR BEFORE MOVING THE HELI.

Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.