Near midair collision between a C152 descending over an uncontrolled airport and a C310 transiting the area. There was no evasive action as the reporter did not sight the other aircraft until it had already cleared underneath the aircraft.

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Attributes
ACN	363962
Time
Date	199703
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : o31
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	other
Flight Plan	None
Aircraft 2
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 90 flight time total : 730 flight time type : 600
ASRS Report	363962
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 400 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

I had simulated an engine failure for my student at about 3000 ft MSL, 2 NM northeast of the airport. Passing overhead I announced on CTAF our position and intentions. We were heading southwest descending out of 2000 ft when I noticed the other aircraft out of the right window just below us opposite direction in a right turn. There was no time for evasive action. There was no evidence the other aircraft was on 122.80 because I never heard his call. The other aircraft departed the area to the southwest toward sonoma county airport (sts). We broke off the simulated engine out and departed for sts also. My student was occupied in reading the engine out checklist so there was no chance for her to see the traffic coming at us from our left. I could not see the traffic because the cowling was in the way until it was directly below us to the right.

Original NASA ASRS Text

Title: NMAC BTWN A C152 DSNDING OVER AN UNCTLED ARPT AND A C310 TRANSITING THE AREA. THERE WAS NO EVASIVE ACTION AS THE RPTR DID NOT SIGHT THE OTHER ACFT UNTIL IT HAD ALREADY CLRED UNDERNEATH THE ACFT.

Narrative: I HAD SIMULATED AN ENG FAILURE FOR MY STUDENT AT ABOUT 3000 FT MSL, 2 NM NE OF THE ARPT. PASSING OVERHEAD I ANNOUNCED ON CTAF OUR POS AND INTENTIONS. WE WERE HEADING SW DSNDING OUT OF 2000 FT WHEN I NOTICED THE OTHER ACFT OUT OF THE R WINDOW JUST BELOW US OPPOSITE DIRECTION IN A R TURN. THERE WAS NO TIME FOR EVASIVE ACTION. THERE WAS NO EVIDENCE THE OTHER ACFT WAS ON 122.80 BECAUSE I NEVER HEARD HIS CALL. THE OTHER ACFT DEPARTED THE AREA TO THE SW TOWARD SONOMA COUNTY ARPT (STS). WE BROKE OFF THE SIMULATED ENG OUT AND DEPARTED FOR STS ALSO. MY STUDENT WAS OCCUPIED IN READING THE ENG OUT CHKLIST SO THERE WAS NO CHANCE FOR HER TO SEE THE TFC COMING AT US FROM OUR L. I COULD NOT SEE THE TFC BECAUSE THE COWLING WAS IN THE WAY UNTIL IT WAS DIRECTLY BELOW US TO THE R.

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.