ALL THREE LANDING GEARS ON A MOONEY M20B ACFT COLLAPSED ON LANDING.

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NO NARRATIVE PROVIDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THIS IS AN OLDER MODEL MOONEY ACFT WITH A MANUAL LANDING GEAR HANDLE KNOWN AS A JOHNSON BAR. THERE IS ONLY ONE GREEN LIGHT FOR ALL THREE GEAR. WHEN THE GEAR ARE TO BE EXTENDED; THE GEAR LEVER (JOHNSON BAR) WHICH IS AT FLOOR LEVEL; BETWEEN THE SEATS; IS PULLED UP AND LOCKED INTO A RETAINER UNDER THE FWD INSTRUMENT PANEL. AT THE SAME TIME; A BUTTON ON THE GEAR HANDLE WILL POP-OUT INDICATING THE HANDLE IS IN THE LOCKED POSITION. THE GREEN 'DOWN AND LOCKED' LIGHT SHOULD ALSO ILLUMINATE. REPORTER ALSO STATED THE GREEN LIGHT DID COME ON; BUT HE FAILED TO VERIFY THE HANDLE WAS ACTUALLY UP AND LOCKED. SO WHEN HE LANDED AND THE GEAR COLLAPSED; THE GEAR HANDLE HAD SLAMMED DOWN BETWEEN THE SEATS. REPORTER FURTHER STATES; THIS WAS NOT A MECHANISM FAILURE. EVEN THOUGH THE GREEN LIGHT CAME ON; HE JUST DIDN'T DOUBLECHK FOR THE HANDLE BEING SECURED IN THE 'UP-LOCK' POSITION RETAINER WITH THE HANDLE BUTTON POPPED-UP. NO DAMAGE TO THE MAIN GEAR DOORS; SOME ON THE NOSE DOORS; BUT THE BELLY ANTENNAS WERE GROUND DOWN. THE PROP WILL BE REPLACED WITH A NEW SCIMITAR TYPE BLADE DESIGN.