Near midair collision on short final at non tower airport unicom.

Attributes
ACN	201713
Time
Date	199202
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : enw
State Reference	WI
Altitude	agl bound lower : 300 agl bound upper : 300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach landing : go around other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	descent : approach other
Route In Use	approach : straight in
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : cfi
Experience	flight time last 90 days : 30 flight time total : 955 flight time type : 248
ASRS Report	201713
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Events
Anomaly	conflict : nmac non adherence : far other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	aircraft : equipment problem dissipated flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 100 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was on an instrument training flight. On board, there were two students and myself as the instructor. One student was under the hood being vectored by me. The other student was in the back seat with instructions to help watch for traffic. We entered a right pattern for 24R on a 45 degree entry, 1000 ft AGL; then entered downwind, base and then to final. The hood was removed when established on final. A position report was made on each leg of the pattern 45 degree downwind, base and final. On short final, my student in the back yelled my name. I glanced over my left shoulder to see what was wrong. The student in the back was pointing out the right window. I spun around to look out my right window; while doing so, I lifted the right wing to see. There was an aircraft just above and slightly behind us. At this time we were on very short final and about 250-300 ft AGL. I made an evasive action by adding full power diving down and banking to my left, turning 180 degree. I stayed low to the ground until I was sure I was out of the other aircraft's way. I then climbed out, circled the airport and reentered the pattern on a 45 degree entry.

Original NASA ASRS Text

Title: NMAC ON SHORT FINAL AT NON TWR ARPT UNICOM.

Narrative: I WAS ON AN INST TRAINING FLT. ON BOARD, THERE WERE TWO STUDENTS AND MYSELF AS THE INSTRUCTOR. ONE STUDENT WAS UNDER THE HOOD BEING VECTORED BY ME. THE OTHER STUDENT WAS IN THE BACK SEAT WITH INSTRUCTIONS TO HELP WATCH FOR TFC. WE ENTERED A R PATTERN FOR 24R ON A 45 DEG ENTRY, 1000 FT AGL; THEN ENTERED DOWNWIND, BASE AND THEN TO FINAL. THE HOOD WAS REMOVED WHEN ESTABLISHED ON FINAL. A POS RPT WAS MADE ON EACH LEG OF THE PATTERN 45 DEG DOWNWIND, BASE AND FINAL. ON SHORT FINAL, MY STUDENT IN THE BACK YELLED MY NAME. I GLANCED OVER MY L SHOULDER TO SEE WHAT WAS WRONG. THE STUDENT IN THE BACK WAS POINTING OUT THE R WINDOW. I SPUN AROUND TO LOOK OUT MY R WINDOW; WHILE DOING SO, I LIFTED THE R WING TO SEE. THERE WAS AN ACFT JUST ABOVE AND SLIGHTLY BEHIND US. AT THIS TIME WE WERE ON VERY SHORT FINAL AND ABOUT 250-300 FT AGL. I MADE AN EVASIVE ACTION BY ADDING FULL PWR DIVING DOWN AND BANKING TO MY L, TURNING 180 DEG. I STAYED LOW TO THE GND UNTIL I WAS SURE I WAS OUT OF THE OTHER ACFT'S WAY. I THEN CLBED OUT, CIRCLED THE ARPT AND REENTERED THE PATTERN ON A 45 DEG ENTRY.

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.