What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The pilot used a checklist to set up for his landing during downwind, base and final. On each leg he verified his gear was down with the green light associated with the gear being down. This light is connected to the position of the johnson bar or gear lever. As he rounded out and flared he heard what he thought was the stall warning horn and touched down with it on. As soon as the mains touched the runway the gear began to collapse and the johnson bar popped out of the socket simultaneously.
As the FAA filed it
THE PILOT USED A CHECKLIST TO SET UP FOR HIS LANDING DURING DOWNWIND, BASE AND FINAL. ON EACH LEG HE VERIFIED HIS GEAR WAS DOWN WITH THE GREEN LIGHT ASSOCIATED WITH THE GEAR BEING DOWN. THIS LIGHT IS CONNECTED TO THE POSITION OF THE JOHNSON BAR OR GEAR LEVER. AS HE ROUNDED OUT AND FLARED HE HEARD WHAT HE THOUGHT WAS THE STALL WARNING HORN AND TOUCHED DOWN WITH IT ON. AS SOON AS THE MAINS TOUCHED THE RUNWAY THE GEAR BEGAN TO COLLAPSE AND THE JOHNSON BAR POPPED OUT OF THE SOCKET SIMULTANEOUSLY.