Flight instructor learns after landing he had a near midair collision during his turn to final.

Attributes
ACN	322035
Time
Date	199511
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sbp
State Reference	CA
Altitude	msl bound lower : 1200 msl bound upper : 1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sbp artcc : zlc
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 80 flight time total : 1300 flight time type : 500
ASRS Report	322035
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other controllera other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	other physical facility procedure or policy : unspecified

Narrative:

Situation occurred while I (the CFI) was practicing in the traffic pattern with a student (student has over 50 hours recent flight time) in a PA28-180. An apparent near midair collision resulted from a misset communication radio in our aircraft which created a lost communications situation during our entry to the base leg of the pattern. The tower was apparently not able to alert us about conflicting traffic on a straight-in, and we never saw the traffic. Distractions in the cockpit potentially kept myself and the student from seeing the converging traffic (although I don't know if it was actually visible to us, since I did not learn of it until speaking with the tower controller after landing).

Original NASA ASRS Text

Title: FLT INSTRUCTOR LEARNS AFTER LNDG HE HAD A NMAC DURING HIS TURN TO FINAL.

Narrative: SIT OCCURRED WHILE I (THE CFI) WAS PRACTICING IN THE TFC PATTERN WITH A STUDENT (STUDENT HAS OVER 50 HRS RECENT FLT TIME) IN A PA28-180. AN APPARENT NMAC RESULTED FROM A MISSET COM RADIO IN OUR ACFT WHICH CREATED A LOST COMS SIT DURING OUR ENTRY TO THE BASE LEG OF THE PATTERN. THE TWR WAS APPARENTLY NOT ABLE TO ALERT US ABOUT CONFLICTING TFC ON A STRAIGHT-IN, AND WE NEVER SAW THE TFC. DISTRACTIONS IN THE COCKPIT POTENTIALLY KEPT MYSELF AND THE STUDENT FROM SEEING THE CONVERGING TFC (ALTHOUGH I DON'T KNOW IF IT WAS ACTUALLY VISIBLE TO US, SINCE I DID NOT LEARN OF IT UNTIL SPEAKING WITH THE TWR CTLR AFTER LNDG).

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.