A MOONEY M20K PVT PLT LOSES CONSCIOUSNESS WHEN HIS OXYGEN HOSE UNKNOWINGLY DISCONNECTS FROM THE TANK. HE HAD TIME TO DISCONNECT THE AUTOPLT AND START A DSCNT.

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WHILE AT FL250 ON AN IFR FLT PLAN FROM FLL TO ANQ; MY OXYGEN LINE BECAME DISCONNECTED FROM THE REGULATOR. I COULD HEAR THE OXYGEN ESCAPING AND THOUGHT THE REGULATOR HAD NOT SEALED ON THE PORTABLE TANK BEHIND THE PAX SEAT. AS I HAD CHANGED TANKS WITHIN THE PAST 15 MINS; I ATTEMPTED TO TIGHTEN THE REGULATOR BUT TO NO AVAIL. I RECOGNIZED HYPOXIA COMING ON; PULLED PWR BACK; DISCONNECTED THE AUTOPLT AND LOST CONSCIOUSNESS. I BECAME CONSCIOUS AT 17000 FT; THE PLANE WAS DSNDING AND IN A BANK. I LEVELED THE PLANE AND DECLARED AN EMER AND TOLD THE CTLR I HAD LOST MY OXYGEN SUPPLY AND HAD LOST CONSCIOUSNESS. I LANDED AT THE NEAREST ARPT (GNV). UPON LNDG I SAW THE LINE TO THE REGULATOR HAD COME OFF. I AM IN GOOD HEALTH; DO NOT SMOKE (EXCEPT OCCASIONAL CIGAR) NOR DRINK. AFTER LNDG; I FELT FINE WITH NO KNOWN AFTER EFFECTS. I HAD THE PLANE FLOWN BACK BY ANOTHER PLT AND UPON AN AOPA ATTORNEY'S ADVICE I AM MAKING AN APPOINTMENT WITH AN FAA MEDICAL EXAMINER FOR A PHYSICAL BEFORE FLYING AGAIN. I HAVE SINCE FOUND THAT IF THE OXYGEN LINE IS KINKED THE LINE WILL POP OFF THE BARBED FITTING ON THE REGULATOR; SO IN THE FUTURE I WILL SECURE A CLAMP AT THIS ATTACHMENT.