A C172 had an near midair collision with an R44 helicopter at the cno airport.

Attributes
ACN	750616
Time
Date	200708
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cno.airport
State Reference	CA
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cno.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : cno.tower
Make Model Name	Robinson R44
Flight Phase	cruise other
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 12 flight time total : 700 flight time type : 695
ASRS Report	750616
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 200 vertical : 200
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I was flying east at 2000 ft level. Cno tower called traffic 10 O'clock; 2 mi. When I observed traffic out of the sun; it was 10 O'clock close. The helicopter was coming toward me. I knew from cno that he was orbiting. I did not know if he was turning north or south. If he had turned north; it would have been no factor. He turned south. This caused me to turn south and rapidly descend to avoid. I don't think the helicopter was in contact with cno tower because I did not hear the tower call him with traffic. Cno tower called the traffic at 1900 ft; I was at 2000 ft. I think the helicopter was 2000 ft.

Original NASA ASRS Text

Title: A C172 HAD AN NMAC WITH AN R44 HELICOPTER AT THE CNO AIRPORT.

Narrative: I WAS FLYING E AT 2000 FT LEVEL. CNO TWR CALLED TFC 10 O'CLOCK; 2 MI. WHEN I OBSERVED TFC OUT OF THE SUN; IT WAS 10 O'CLOCK CLOSE. THE HELI WAS COMING TOWARD ME. I KNEW FROM CNO THAT HE WAS ORBITING. I DID NOT KNOW IF HE WAS TURNING N OR S. IF HE HAD TURNED N; IT WOULD HAVE BEEN NO FACTOR. HE TURNED S. THIS CAUSED ME TO TURN S AND RAPIDLY DSND TO AVOID. I DON'T THINK THE HELI WAS IN CONTACT WITH CNO TWR BECAUSE I DID NOT HEAR THE TWR CALL HIM WITH TFC. CNO TWR CALLED THE TFC AT 1900 FT; I WAS AT 2000 FT. I THINK THE HELI WAS 2000 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.