An A109 helicopter pilot; flying VFR; experiences near midair collision with another aircraft.

Attributes
ACN	752926
Time
Date	200709
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air taxi
Make Model Name	A109
Operating Under FAR Part	Part 135
Flight Phase	cruise : level
Flight Plan	None
Aircraft 2
Make Model Name	Bonanza 35
Flight Phase	cruise : level
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 4250 flight time type : 60
ASRS Report	752926
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While flying on a heading of northeast (approximately 060 degrees magnetic) to the medical center helicopter landing pads; a beechcraft bonanza was flying on a converging course and sighted by me from my aircraft at about 4 O'clock low position and about a combined distance of 600 ft. The rate of convergence was so quick that there was no time to take action as the bonanza passed below me within 300 ft and appeared again on the left side probably flying toward ZZZ. The bonanza was likely on a heading of northwest to north. I was not on a flight plan; but was listening to the nearest control tower. The other aircraft may have been tuned to another frequency. I was in on the medical xfer leg of a critically ill patient and was going to be entering the controled airspace of ZZZ so I had no time to verify the identity of the other aircraft. I believe the other aircraft was probably flying at an MSL altitude of about 1500 ft.

Original NASA ASRS Text

Title: AN A109 HELI PLT; FLYING VFR; EXPERIENCES NMAC WITH ANOTHER AIRCRAFT.

Narrative: WHILE FLYING ON A HDG OF NE (APPROX 060 DEGS MAGNETIC) TO THE MEDICAL CTR HELI LNDG PADS; A BEECHCRAFT BONANZA WAS FLYING ON A CONVERGING COURSE AND SIGHTED BY ME FROM MY ACFT AT ABOUT 4 O'CLOCK LOW POS AND ABOUT A COMBINED DISTANCE OF 600 FT. THE RATE OF CONVERGENCE WAS SO QUICK THAT THERE WAS NO TIME TO TAKE ACTION AS THE BONANZA PASSED BELOW ME WITHIN 300 FT AND APPEARED AGAIN ON THE L SIDE PROBABLY FLYING TOWARD ZZZ. THE BONANZA WAS LIKELY ON A HDG OF NW TO N. I WAS NOT ON A FLT PLAN; BUT WAS LISTENING TO THE NEAREST CTL TWR. THE OTHER ACFT MAY HAVE BEEN TUNED TO ANOTHER FREQ. I WAS IN ON THE MEDICAL XFER LEG OF A CRITICALLY ILL PATIENT AND WAS GOING TO BE ENTERING THE CTLED AIRSPACE OF ZZZ SO I HAD NO TIME TO VERIFY THE IDENTITY OF THE OTHER ACFT. I BELIEVE THE OTHER ACFT WAS PROBABLY FLYING AT AN MSL ALT OF ABOUT 1500 FT.

Data retrieved from NASA's ASRS site as of January 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.