What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
PIC took off from tiw on test flight for privacy data omitted. Upon raising the gear handle, PIC noticed that the gear did not make its normal audible "thud" when the gear was up and locked. PIC then preceeded to make a pass by the tower to ask if the gear was up or down. Tower confirmed gear was still in the down position. PIC then decided to land and check out the issue, placing the gear handle back into the down position. Upon landng the gear collapsed resulting in the aircraft sliding down the runway on it's underside.
As the FAA filed it
PIC TOOK OFF FROM TIW ON TEST FLIGHT FOR ^PRIVACY DATA OMITTED^. UPON RAISING THE GEAR HANDLE, PIC NOTICED THAT THE GEAR DID NOT MAKE ITS NORMAL AUDIBLE "THUD" WHEN THE GEAR WAS UP AND LOCKED. PIC THEN PRECEEDED TO MAKE A PASS BY THE TOWER TO ASK IF THE GEAR WAS UP OR DOWN. TOWER CONFIRMED GEAR WAS STILL IN THE DOWN POSITION. PIC THEN DECIDED TO LAND AND CHECK OUT THE ISSUE, PLACING THE GEAR HANDLE BACK INTO THE DOWN POSITION. UPON LANDNG THE GEAR COLLAPSED RESULTING IN THE AIRCRAFT SLIDING DOWN THE RUNWAY ON IT'S UNDERSIDE.