Instructor with spi has near midair collision on final with small aircraft at uncontrolled airport.

Attributes
ACN	218498
Time
Date	199208
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : o45
State Reference	CA
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, Fixed Gear
Flight Phase	descent : approach other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 835 flight time type : 200
ASRS Report	218498
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : student
Events
Anomaly	conflict : nmac other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 100 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

This describes a typical hazard at uncontrolled airport. Student pilot and me (CFI acting as PIC) announced several times position in traffic pattern (45 to downwind, downwind midfield) and downwind base turn. We also heard an small aircraft announcing a crossing leg entry when on downwind and assumed him behind us as #2. We extended downwind for 1 departure (we announced this as well) and then called our base turn. Just when I called 1/2 mi final, the small aircraft did the same and appeared from a short approach position from the right rapidly descending and converging. I pulled up and to the left to avoid collision. It appeared from the following conversation that the small aircraft never saw us. The pilot was confused and went around and we completed an uneventful landing. Moral: 1) people have to listen not only to talk of uncontrolled field. 2) keep eyes open and head swiveling. 3) be extra cautious if you hear an small aircraft in VFR.

Original NASA ASRS Text

Title: INSTRUCTOR WITH SPI HAS NMAC ON FINAL WITH SMA AT UNCTLED ARPT.

Narrative: THIS DESCRIBES A TYPICAL HAZARD AT UNCTLED ARPT. STUDENT PLT AND ME (CFI ACTING AS PIC) ANNOUNCED SEVERAL TIMES POS IN TFC PATTERN (45 TO DOWNWIND, DOWNWIND MIDFIELD) AND DOWNWIND BASE TURN. WE ALSO HEARD AN SMA ANNOUNCING A XING LEG ENTRY WHEN ON DOWNWIND AND ASSUMED HIM BEHIND US AS #2. WE EXTENDED DOWNWIND FOR 1 DEP (WE ANNOUNCED THIS AS WELL) AND THEN CALLED OUR BASE TURN. JUST WHEN I CALLED 1/2 MI FINAL, THE SMA DID THE SAME AND APPEARED FROM A SHORT APCH POS FROM THE R RAPIDLY DSNDING AND CONVERGING. I PULLED UP AND TO THE L TO AVOID COLLISION. IT APPEARED FROM THE FOLLOWING CONVERSATION THAT THE SMA NEVER SAW US. THE PLT WAS CONFUSED AND WENT AROUND AND WE COMPLETED AN UNEVENTFUL LNDG. MORAL: 1) PEOPLE HAVE TO LISTEN NOT ONLY TO TALK OF UNCTLED FIELD. 2) KEEP EYES OPEN AND HEAD SWIVELING. 3) BE EXTRA CAUTIOUS IF YOU HEAR AN SMA IN VFR.

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.