Narrative:

I was flying a helicopter; landing at midway on the FBO ramp. I was cleared to land at the FBO from the west and stay west of the runway. As I was landing at the ramp I was approaching the runway and an air carrier was on takeoff. I was just at the edge of the runway and I made a left turn to avoid traffic. At this time; the controller was dealing with a bonanza pilot who had just penetrated the ord inner ring and thought that he was approaching midway. The controller was giving the bonanza a frequency for ord and was dealing with the airspace violation at the time of my landing. I never heard a takeoff clearance for the B737. I requested further instructions from the tower. The tower thought I was landing at the other FBO ramp on the west side of the airport. I feel that the incident occurred due to a confusion as to which ramp I was landing. Also; I felt the controller may have been occupied by the bonanza pilot who thought he was in midway's airspace but was really in the ord class B inner ring. I'm not sure if the controller was aware of the seriousness of the situation. Also; the air carrier crew never mentioned any concern. I felt the air carrier departure was done in haste. Traffic at midway was very light at the time. I land at the mdw FBO ramp frequently. This isn't the first time there was some confusion between the 2 ramps; however; this is the most serious. I also feel that the clrncs for me and the air carrier may have been given too far away due to the light traffic.

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Original NASA ASRS Text

Title: HELI PLT HAS NMAC WITH DEPARTING ACR WHILE LANDING AT THE SOUTH RAMP AT MDW.

Narrative: I WAS FLYING A HELI; LNDG AT MIDWAY ON THE FBO RAMP. I WAS CLRED TO LAND AT THE FBO FROM THE W AND STAY W OF THE RWY. AS I WAS LNDG AT THE RAMP I WAS APCHING THE RWY AND AN ACR WAS ON TKOF. I WAS JUST AT THE EDGE OF THE RWY AND I MADE A L TURN TO AVOID TFC. AT THIS TIME; THE CTLR WAS DEALING WITH A BONANZA PLT WHO HAD JUST PENETRATED THE ORD INNER RING AND THOUGHT THAT HE WAS APCHING MIDWAY. THE CTLR WAS GIVING THE BONANZA A FREQ FOR ORD AND WAS DEALING WITH THE AIRSPACE VIOLATION AT THE TIME OF MY LNDG. I NEVER HEARD A TKOF CLRNC FOR THE B737. I REQUESTED FURTHER INSTRUCTIONS FROM THE TWR. THE TWR THOUGHT I WAS LNDG AT THE OTHER FBO RAMP ON THE W SIDE OF THE ARPT. I FEEL THAT THE INCIDENT OCCURRED DUE TO A CONFUSION AS TO WHICH RAMP I WAS LNDG. ALSO; I FELT THE CTLR MAY HAVE BEEN OCCUPIED BY THE BONANZA PLT WHO THOUGHT HE WAS IN MIDWAY'S AIRSPACE BUT WAS REALLY IN THE ORD CLASS B INNER RING. I'M NOT SURE IF THE CTLR WAS AWARE OF THE SERIOUSNESS OF THE SITUATION. ALSO; THE ACR CREW NEVER MENTIONED ANY CONCERN. I FELT THE ACR DEP WAS DONE IN HASTE. TFC AT MIDWAY WAS VERY LIGHT AT THE TIME. I LAND AT THE MDW FBO RAMP FREQUENTLY. THIS ISN'T THE FIRST TIME THERE WAS SOME CONFUSION BTWN THE 2 RAMPS; HOWEVER; THIS IS THE MOST SERIOUS. I ALSO FEEL THAT THE CLRNCS FOR ME AND THE ACR MAY HAVE BEEN GIVEN TOO FAR AWAY DUE TO THE LIGHT TFC.

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.