Incident
The seaplane departed Christiansted, St. Croix, bound for Charlotte Amalie, St. Thomas. While at cruising altitude, one of the engines failed. The pilot, Captain Charles Blair, 69, who was also the owner of the company, attempted to ditch the aircraft off St. Thomas Island. The seaplane crashed into the sea, resulting in the deaths of three passengers and the pilot. Seven other occupants were injured. The aircraft was lost.
Investigation
Official investigation findings identified the probable cause of the accident as engine failure in flight due to improper maintenance. Several contributing factors were reported, including a powerplant failure due to engine structure issues involving a cylinder assembly and fatigue fracture. Additional factors included improper in-flight decisions or planning, improper emergency procedures, and inadequate supervision of the flight crew. Deficiencies were noted in company-maintained equipment, services, and regulations, as well as in rules, regulations, and standards personnel. The aircraft came to rest in water, and a forced landing off airport on water was performed. A Supplemental Type Certificate (STC) approved flight at a maximum gross weight of 8,750 lbs, but tests indicated the actual gross weight at the time of the accident was 8,150 lbs.
Probable Cause
Engine failure in flight due to improper maintenance.