Pilot of PA46 malibu on downwind leg of traffic pattern has near midair collision with aircraft at same altitude, opposite direction. Both aircraft take evasive action.

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Attributes
ACN	389242
Time
Date	199712
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isz
State Reference	OH
Altitude	msl bound lower : 1800 msl bound upper : 1800
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : phl
Operator	general aviation : corporate
Make Model Name	PA-46 Malibu
Operating Under FAR Part	Part 91
Flight Phase	descent : approach other
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 49 flight time total : 585 flight time type : 115
ASRS Report	389242
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were entering the downwind leg (r-hand traffic) of the traffic pattern for runway 24 at blue ash airport (isz), cincinnati, oh, when the second plane, a high wing, single engine propeller plane, possibly a C172, approached us at approximately the same altitude, headed in the opposite direction. Both planes diverted to the right. We had announced our position and intentions twice on frequency 123.0. We did not hear any radio transmission from the second plane. It was dark and the entire incident happened quickly. As a result, we did not identify the plane or its tail number. After landing, we did not see the other plane in the pattern on landing. I am not sure how this incident could have been prevented, but the second plane should not have been in the pattern, going the wrong direction, with no radio communication. Perhaps, the possibility of a standard traffic pattern at blue ash (l-hand traffic for runway 24) should be investigated. At the time of this incident, we had been cleared by ATC to change frequency to the local advisory channel (123.0).

Original NASA ASRS Text

Title: PLT OF PA46 MALIBU ON DOWNWIND LEG OF TFC PATTERN HAS NMAC WITH ACFT AT SAME ALT, OPPOSITE DIRECTION. BOTH ACFT TAKE EVASIVE ACTION.

Narrative: WE WERE ENTERING THE DOWNWIND LEG (R-HAND TFC) OF THE TFC PATTERN FOR RWY 24 AT BLUE ASH ARPT (ISZ), CINCINNATI, OH, WHEN THE SECOND PLANE, A HIGH WING, SINGLE ENG PROP PLANE, POSSIBLY A C172, APCHED US AT APPROX THE SAME ALT, HEADED IN THE OPPOSITE DIRECTION. BOTH PLANES DIVERTED TO THE R. WE HAD ANNOUNCED OUR POS AND INTENTIONS TWICE ON FREQ 123.0. WE DID NOT HEAR ANY RADIO XMISSION FROM THE SECOND PLANE. IT WAS DARK AND THE ENTIRE INCIDENT HAPPENED QUICKLY. AS A RESULT, WE DID NOT IDENT THE PLANE OR ITS TAIL NUMBER. AFTER LNDG, WE DID NOT SEE THE OTHER PLANE IN THE PATTERN ON LNDG. I AM NOT SURE HOW THIS INCIDENT COULD HAVE BEEN PREVENTED, BUT THE SECOND PLANE SHOULD NOT HAVE BEEN IN THE PATTERN, GOING THE WRONG DIRECTION, WITH NO RADIO COM. PERHAPS, THE POSSIBILITY OF A STANDARD TFC PATTERN AT BLUE ASH (L-HAND TFC FOR RWY 24) SHOULD BE INVESTIGATED. AT THE TIME OF THIS INCIDENT, WE HAD BEEN CLRED BY ATC TO CHANGE FREQ TO THE LCL ADVISORY CHANNEL (123.0).

Data retrieved from NASA's ASRS site as of July 2007 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.