What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The PIC stated once he was given clearance to land by San Juan act, he selected landing gear down and completed the before landing check list, everything appeared normal continuing the approach to final with a 30 degree flap setting touching down between 500 and 1000 feet down the runway at which time both main wheels immediately retracted causing both propellers and trailing edge of the flaps to contact the runway.
As the FAA filed it
THE PIC STATED ONCE HE WAS GIVEN CLEARANCE TO LAND BY SAN JUAN ACT, HE SELECTED LANDING GEAR DOWN AND COMPLETED THE BEFORE LANDING CHECK LIST, EVERYTHING APPEARED NORMAL CONTINUING THE APPROACH TO FINAL WITH A 30 DEGREE FLAP SETTING TOUCHING DOWN BETWEEN 500 AND 1000 FEET DOWN THE RUNWAY AT WHICH TIME BOTH MAIN WHEELS IMMEDIATELY RETRACTED CAUSING BOTH PROPELLERS AND TRAILING EDGE OF THE FLAPS TO CONTACT THE RUNWAY.