What happened
On a flight originating from San Juan, Puerto Rico, bound for St. Vincent, a twin-engine aircraft experienced a mechanical issue involving the loss of the left engine cowling. During the flight, the pilot contacted air traffic control to request a diversion to St. Thomas, noting that the left engine had been feathered. Although the pilot did not declare an emergency at that time, the flight path was later changed to Roosevelt Roads, Puerto Rico.
As the aircraft approached the coast, the pilot reported a descent rate of approximately 300 feet per minute. Shortly thereafter, the pilot indicated an intention to attempt an engine restart as the aircraft neared the surface of the water. The final communication from the aircraft stated that the pilot would be unable to reach the shore. Following the loss of contact, search and rescue operations were initiated. The wreckage was eventually located approximately 6 miles east of Roosevelt Roads Naval Air Station, but the pilot remained missing.
Findings
An investigation into the flight parameters revealed that the aircraft had exceeded its maximum authorized takeoff weight. Additionally, a review of the weight and balance documentation indicated that the pilot had failed to adhere to established written procedures. The investigation also noted that the crew had received manufacturer communications stating that engine shutdown and propeller feathering should only be performed if engine performance issues or significant vibrations necessitated the action.