What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Aircraft lifted off from fishing boat without removing "unapproved rudder pedal lock." Witness stated he observed pilot reaching for something, possible "rudder pedal lock." Aircraft was seen spinning about the vertical axis immediately after takeoff. Aircraft impacted the water shortly after takeoff. The floats attached to the aircraft departed the aircraft on impact with the water. The observer on board the aircraft was able to get free of the aircraft but sustained serious injuries. The aircraft, upon impact with the water, immediately sank. The pilot was never found.
As the FAA filed it
(-23) AIRCRAFT LIFTED OFF FROM FISHING BOAT WITHOUT REMOVING "UNAPPROVED RUDDER PEDAL LOCK." WITNESS STATED HE OBSERVED PILOT REACHING FOR SOMETHING, POSSIBLE "RUDDER PEDAL LOCK." AIRCRAFT WAS SEEN SPINNING ABOUT THE VERTICAL AXIS IMMEDIATELY AFTER TAKEOFF. AIRCRAFT IMPACTED THE WATER SHORTLY AFTER TAKEOFF. THE FLOATS ATTACHED TO THE AIRCRAFT DEPARTED THE AIRCRAFT ON IMPACT WITH THE WATER. THE OBSERVER ON BOARD THE AIRCRAFT WAS ABLE TO GET FREE OF THE AIRCRAFT BUT SUSTAINED SERIOUS INJURIES. THE AIRCRAFT, UPON IMPACT WITH THE WATER, IMMEDIATELY SANK. THE PILOT WAS NEVER FOUND.