What happened
During a convoy coverage mission, the seaplane experienced a critical mechanical issue while airborne. The pilot reported a loss of engine oil supply, which resulted in the failure of the starboard engine. With one engine inoperative, the crew executed an emergency landing in a sandy area located east of Santo Amaro do Maranhão, at coordinates 2° 26' S 43° 8' W.
All 10 individuals on board escaped the aircraft with minor injuries. The seaplane sustained damage that rendered it beyond repair. The crew consisted of three pilots and seven other aircrew members serving in various technical and maintenance roles.
Findings
Investigations determined that the immediate cause of the incident was the starboard oil cap becoming open during flight. This mechanical failure allowed the oil tank supply to be released, leading to oil starvation in the right engine and its subsequent failure.