Narrative:

I was flying right seat, training for CFI-a check ride with my instructor. Incident occurred on 7TH touch-and-go. I performed gumps checklist abeam the numbers. We were doing a power-off 180 degree accuracy landing -- gear down, green light, mixture, propeller, throttle, etc. Carburetor heat on. A normal base, final, and on flare, gear collapsed or had not come down, skidded to a stop. Gearwheels were smashed underneath aircraft, but had been put down. Contributing factors: this aircraft had previously had a gear malfunction in the previous 7 months (a gear incident). However, I should have visually idented that the gear was down and I was too focused on the point on the runway where I was to land without power. I relied on instructor to monitor the gear down outside the window instead of doing it myself. Had I been only pilot on aircraft, I would not have landed without checking gear visually. Supplemental information from acn 636186: both my student and I saw and confirmed the green light indicating the gear to be down and locked. We do not know if the gear safe indication was false and the gear never locked into place, or if the gear had actually locked and collapsed all the same. The aircraft suffered damage to the belly skin, all belly antennas and the propeller due to it striking the ground. I believe this accident occurred because of an unreliable gear down indication (green light). At this time I do not know how this could occur and do not have any suggestions on how this kind of incident could be averted.

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Original NASA ASRS Text

Title: C172RG STUDENT PLT AND INSTRUCTOR PLT HAD THE LNDG GEAR COLLAPSE ON LNDG.

Narrative: I WAS FLYING R SEAT, TRAINING FOR CFI-A CHK RIDE WITH MY INSTRUCTOR. INCIDENT OCCURRED ON 7TH TOUCH-AND-GO. I PERFORMED GUMPS CHKLIST ABEAM THE NUMBERS. WE WERE DOING A PWR-OFF 180 DEG ACCURACY LNDG -- GEAR DOWN, GREEN LIGHT, MIXTURE, PROP, THROTTLE, ETC. CARB HEAT ON. A NORMAL BASE, FINAL, AND ON FLARE, GEAR COLLAPSED OR HAD NOT COME DOWN, SKIDDED TO A STOP. GEARWHEELS WERE SMASHED UNDERNEATH ACFT, BUT HAD BEEN PUT DOWN. CONTRIBUTING FACTORS: THIS ACFT HAD PREVIOUSLY HAD A GEAR MALFUNCTION IN THE PREVIOUS 7 MONTHS (A GEAR INCIDENT). HOWEVER, I SHOULD HAVE VISUALLY IDENTED THAT THE GEAR WAS DOWN AND I WAS TOO FOCUSED ON THE POINT ON THE RWY WHERE I WAS TO LAND WITHOUT PWR. I RELIED ON INSTRUCTOR TO MONITOR THE GEAR DOWN OUTSIDE THE WINDOW INSTEAD OF DOING IT MYSELF. HAD I BEEN ONLY PLT ON ACFT, I WOULD NOT HAVE LANDED WITHOUT CHKING GEAR VISUALLY. SUPPLEMENTAL INFO FROM ACN 636186: BOTH MY STUDENT AND I SAW AND CONFIRMED THE GREEN LIGHT INDICATING THE GEAR TO BE DOWN AND LOCKED. WE DO NOT KNOW IF THE GEAR SAFE INDICATION WAS FALSE AND THE GEAR NEVER LOCKED INTO PLACE, OR IF THE GEAR HAD ACTUALLY LOCKED AND COLLAPSED ALL THE SAME. THE ACFT SUFFERED DAMAGE TO THE BELLY SKIN, ALL BELLY ANTENNAS AND THE PROP DUE TO IT STRIKING THE GND. I BELIEVE THIS ACCIDENT OCCURRED BECAUSE OF AN UNRELIABLE GEAR DOWN INDICATION (GREEN LIGHT). AT THIS TIME I DO NOT KNOW HOW THIS COULD OCCUR AND DO NOT HAVE ANY SUGGESTIONS ON HOW THIS KIND OF INCIDENT COULD BE AVERTED.

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.