LNDG GEAR COLLAPSE.

Narrative

I WAS ACTING AS A CFI/CFII AND GIVING A MAN A BFR/ICC. I MADE THE ERROR OF NOT VISUALLY CHKING FOR HIS LICENSE AND MEDICAL. HE SAID HE HAD THEM; BUT ACTUALLY HE DID NOT. WE WENT INTO PTK FOR A LNDG. IT WAS VERY WINDY AND TURBULENT; BUT THE WIND WAS DIRECTLY DOWN THE RWY. I SAW HIM PUT THE LNDG GEAR DOWN; AND WE HAD 3 GREEN LIGHTS. WE BEGAN OUR FLARE; AND EVERYTHING SEEMED OK. THE WHEELS TOUCHED DOWN SLIGHTLY; BUT WE DID NOT SETTLE DOWN. WE BALLOONED SLIGHTLY AND WENT BACK INTO THE AIR A FEW INCHES. THE GEAR HORN STARTED SOUNDING AS WE SETTLED BACK DOWN. OUR L GEAR COLLAPSED AS WE SETTLED DOWN. THE PLT KEPT IT ON THE R WHEEL AS LONG AS POSSIBLE AND SHUT THE ENG DOWN. WE STOPPED NEAR THE EDGE OF THE RWY; WITH THE L WINGTIP AND THE TAIL ON THE GND. I FEEL THAT HE DID THE RIGHT THING AND LANDED THE AIRPLANE. IT WAS TOO LATE TO GAR. I NEVER TOUCHED THE CTLS; BECAUSE THERE WAS NO NEED TO. THE PLT HAD IT UNDER CTL. HE LOOKED AFTER WE LANDED AND DISCOVERED HIS LICENSE AND MEDICAL WERE AT HOME. SO; AS THE LEGAL PIC; I FEEL THE SIT WAS UNAVOIDABLE AND HANDLED PROPERLY.