P210 pilot downwind to landing had to take evasive action to avoid another aircraft.

Attributes
ACN	685240
Time
Date	200601
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : aeg.airport
State Reference	NM
Altitude	msl single value : 6800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C 210D
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : multi engine pilot : flight engineer pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 6500 flight time type : 75
ASRS Report	685240
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : airborne critical other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Supplementary
Problem Areas	Aircraft Airport Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I was approaching airport from the ene; and talking to approach. I was cleared from approach frequency and radar services terminated to communicated on CTAF. I advised that I would be landing runway 17 from the east. I was told by someone in the pattern on unicom that the active runway was runway 22. ATC also advised of traffic on approach to runway 22 and a practice instrument approach. I was at approximately 2000 ft MSL and elected to stay above the final approach course and pass to the wnw of the airport and descend to the pattern and a left turn to the southwest then another left turn to enter pattern on downwind to runway 22. Keep in mind runway 22 has r-hand traffic. Shortly after my turn to the southwest approximately 2 mi wnw of the airport; I encountered other aircraft on a wide right downwind for runway 22 -- a 2 place trainer; I believe. We both saw each other and both aircraft took evasive action and turned right. However; it was very close. I believe neither aircraft saw the other coming. This could have been prevented if I would have gone further to the west of the airport and returned for landing. However this airport is uncontrolled and very busy with training and other operations. It seemed that not all aircraft were communicating as I was unaware of the other aircraft in the pattern.

Original NASA ASRS Text

Title: P210 PLT DOWNWIND TO LNDG HAD TO TAKE EVASIVE ACTION TO AVOID ANOTHER ACFT.

Narrative: I WAS APCHING ARPT FROM THE ENE; AND TALKING TO APCH. I WAS CLRED FROM APCH FREQ AND RADAR SVCS TERMINATED TO COMMUNICATED ON CTAF. I ADVISED THAT I WOULD BE LNDG RWY 17 FROM THE E. I WAS TOLD BY SOMEONE IN THE PATTERN ON UNICOM THAT THE ACTIVE RWY WAS RWY 22. ATC ALSO ADVISED OF TFC ON APCH TO RWY 22 AND A PRACTICE INST APCH. I WAS AT APPROX 2000 FT MSL AND ELECTED TO STAY ABOVE THE FINAL APCH COURSE AND PASS TO THE WNW OF THE ARPT AND DSND TO THE PATTERN AND A L TURN TO THE SW THEN ANOTHER L TURN TO ENTER PATTERN ON DOWNWIND TO RWY 22. KEEP IN MIND RWY 22 HAS R-HAND TFC. SHORTLY AFTER MY TURN TO THE SW APPROX 2 MI WNW OF THE ARPT; I ENCOUNTERED OTHER ACFT ON A WIDE R DOWNWIND FOR RWY 22 -- A 2 PLACE TRAINER; I BELIEVE. WE BOTH SAW EACH OTHER AND BOTH ACFT TOOK EVASIVE ACTION AND TURNED R. HOWEVER; IT WAS VERY CLOSE. I BELIEVE NEITHER ACFT SAW THE OTHER COMING. THIS COULD HAVE BEEN PREVENTED IF I WOULD HAVE GONE FURTHER TO THE W OF THE ARPT AND RETURNED FOR LNDG. HOWEVER THIS ARPT IS UNCTLED AND VERY BUSY WITH TRAINING AND OTHER OPS. IT SEEMED THAT NOT ALL ACFT WERE COMMUNICATING AS I WAS UNAWARE OF THE OTHER ACFT IN THE PATTERN.

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.