C172 instructional flight involved in near midair collision with aircraft in traffic pattern.

Attributes
ACN	766033
Time
Date	200712
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rhv.airport
State Reference	CA
Altitude	msl single value : 1100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : rhv.tower
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : rhv.tower
Make Model Name	Piper Aircraft Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : private pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 1700 flight time type : 300
ASRS Report	766033
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	conflict : nmac
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time
Miss Distance	horizontal : 100 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

On right downwind to runway 31L due to runway 31R closed for aircraft with blown tire on runway. Student had climbed above tpa on downwind to 1300 ft. I had just pointed altitude error out to him and he was in a descent back to 1100 ft. I heard a transmission from tower directing an inbound aircraft to make right traffic (did not discern aircraft n-number). As we came abeam runway 31 approach end I reminded student to reduce power; apply 10 degree flaps and begin descent. At that point I received a call from tower that traffic was 12 O'clock position 1 mi; immediately followed by a call 'piper (the other aircraft) you're going the wrong way.' I first saw the piper +/-50-100 ft high and 100 ft at my 11 O'clock position. Tower kept calling 'piper you're going the wrong way.' I did not interrupt tower's call because the piper had already passed us. The piper finally responded that he would do a 360 and reenter downwind. We landed and continued in left pattern for runway 31L for 1 more landing; then terminated. My error was in being involved in my student's actions and not visually detecting the approaching head on traffic before the call from tower. I do not know if the piper ever saw us; classical low wing higher than high wing blind spot.

Original NASA ASRS Text

Title: C172 INSTRUCTIONAL FLT INVOLVED IN NMAC WITH ACFT IN TFC PATTERN.

Narrative: ON R DOWNWIND TO RWY 31L DUE TO RWY 31R CLOSED FOR ACFT WITH BLOWN TIRE ON RWY. STUDENT HAD CLBED ABOVE TPA ON DOWNWIND TO 1300 FT. I HAD JUST POINTED ALT ERROR OUT TO HIM AND HE WAS IN A DSCNT BACK TO 1100 FT. I HEARD A XMISSION FROM TWR DIRECTING AN INBOUND ACFT TO MAKE R TFC (DID NOT DISCERN ACFT N-NUMBER). AS WE CAME ABEAM RWY 31 APCH END I REMINDED STUDENT TO REDUCE PWR; APPLY 10 DEG FLAPS AND BEGIN DSCNT. AT THAT POINT I RECEIVED A CALL FROM TWR THAT TFC WAS 12 O'CLOCK POS 1 MI; IMMEDIATELY FOLLOWED BY A CALL 'PIPER (THE OTHER ACFT) YOU'RE GOING THE WRONG WAY.' I FIRST SAW THE PIPER +/-50-100 FT HIGH AND 100 FT AT MY 11 O'CLOCK POS. TWR KEPT CALLING 'PIPER YOU'RE GOING THE WRONG WAY.' I DID NOT INTERRUPT TWR'S CALL BECAUSE THE PIPER HAD ALREADY PASSED US. THE PIPER FINALLY RESPONDED THAT HE WOULD DO A 360 AND REENTER DOWNWIND. WE LANDED AND CONTINUED IN L PATTERN FOR RWY 31L FOR 1 MORE LNDG; THEN TERMINATED. MY ERROR WAS IN BEING INVOLVED IN MY STUDENT'S ACTIONS AND NOT VISUALLY DETECTING THE APCHING HEAD ON TFC BEFORE THE CALL FROM TWR. I DO NOT KNOW IF THE PIPER EVER SAW US; CLASSICAL LOW WING HIGHER THAN HIGH WING BLIND SPOT.

Data retrieved from NASA's ASRS site as of January 2009 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.